Diff Lock Switch Pack

Diff Lock Switch Pack http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html The diff lock switch pack normally forces you to engage the diffs in the sequence center-rear-front. But you can modify the switch pack to remove this restriction. Let’s first look at how it normally works. We start by pressing the center switch on the diff pack. The yellow lamp comes on, and power is sent to the center diff solenoid (green lamp) http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#0 55c8f3e2-2747-4176-9531-a47d39b88b4b http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8586.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8586.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Let’s first look at how it normally works. We start by pressing the center switch on the diff pack. The yellow lamp comes on, and power is sent to the center diff solenoid (green lamp)</p></div></div> Next we press the rear lock button. Pressing the front locker button does nothing. No power is sent to the rear lock solenoid yet. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#1 b2b3f6c0-9bfa-430a-9c8f-adc6ea7b8426 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8587.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8587.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Next we press the rear lock button. Pressing the front locker button does nothing. No power is sent to the rear lock solenoid yet.</p></div></div> We can now select the front locker. No power is sent to it yet. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#2 edc2e575-333f-4e70-8d4c-5e6e3fae6fba http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8588.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8588.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">We can now select the front locker. No power is sent to it yet.</p></div></div> If we flip the switch representing the center-lock sensor, the red lamp indicates lock, and now power is allowed to go the rear locker http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#3 1a9a54aa-753e-4868-aa58-ffbf1a500461 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8589.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8589.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">If we flip the switch representing the center-lock sensor, the red lamp indicates lock, and now power is allowed to go the rear locker</p></div></div> If we flip the switch representing the rear-lock sensor, the red lamp indicates lock, and power is allowed to go to the front locker http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#4 686afb10-75db-4617-96a6-64e34cd6f899 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8590.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8590.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">If we flip the switch representing the rear-lock sensor, the red lamp indicates lock, and power is allowed to go to the front locker</p></div></div> Next we flip the switch representing the front locker sensor, and all the red lamps are on to indicate all lockers engaged. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#5 e3a3b8d5-dabd-4366-83a2-4ff511b13959 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8591.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8591.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Next we flip the switch representing the front locker sensor, and all the red lamps are on to indicate all lockers engaged.</p></div></div> If you pushed the center button now, all three yellow lights would go off immediately. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#6 012df900-b7c2-4a27-a3ee-e2ae0322e695 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8591_1.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8591_1.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">If you pushed the center button now, all three yellow lights would go off immediately.</p></div></div> If we disengage the toggle switch representing the center diff sensor, the red lamp goes off, and power is automatically removed from the rear diff solenoid http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#7 8a02f6f2-9d69-4e98-8511-09850d59b42a http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8592.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8592.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">If we disengage the toggle switch representing the center diff sensor, the red lamp goes off, and power is automatically removed from the rear diff solenoid</p></div></div> If we disengage the switch representing the rear diff sensor, the red lamp goes off, and power is automatically removed from the front diff http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#8 222eaf38-ed00-45d6-a4af-99adce06a24b http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8593.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8593.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">If we disengage the switch representing the rear diff sensor, the red lamp goes off, and power is automatically removed from the front diff</p></div></div> With all the sensors showing unlock, power is still being sent to the center diff, because it (and the others) is still selected (yellow lamps) http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#9 6ae8eaf9-d9f7-47b5-8a64-a13ef9f1efe1 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8594.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8594.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">With all the sensors showing unlock, power is still being sent to the center diff, because it (and the others) is still selected (yellow lamps)</p></div></div> Finally, press the center button to deselect the center diff, and both of the other diffs will be automatically deselected as well. So that all shows how the unit is supposed to work normally http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#10 059b9a08-57f4-4f16-b98c-70142ab42e42 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8581.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8581.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Finally, press the center button to deselect the center diff, and both of the other  diffs will be automatically deselected as well. So that all shows how the unit is supposed to work normally</p></div></div> A training slide from Mercedes describes what it does http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#11 ec475d70-bbf6-4d26-9617-2dd26d7013e4 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/diffpump.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/diffpump.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">A training slide from Mercedes describes what it does</p></div></div> This pump supplies the vacuum and the loud rattle http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#12 cf678b2a-a350-4980-989d-ae7bb15edb2d http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/diffpumpb.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/diffpumpb.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">This pump supplies the vacuum and the loud rattle</p></div></div> So let’s start hacking! If you are really careful you can pop the switch pack out of the dash using a blade. The proper way is to remove the wood trim below. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#13 8a12a25f-2425-46ad-b281-2e96a5c6f45e http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3711.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3711.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">So let’s start hacking! If you are really careful you can pop the switch pack out of the dash using a blade. The proper way is to remove the wood trim below.</p></div></div> It’s only held in by those springy clips along the top and bottom (visible here at the sides) http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#14 686eba4c-ac37-4417-b8ad-9427300a31c2 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3672.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3672.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">It’s only held in by those springy clips along the top and bottom (visible here at the sides)</p></div></div> Another view of those clips along one edge. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#15 484d0eac-f433-4db7-94e2-528a700fdd73 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3669.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3669.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Another view of those clips along one edge.</p></div></div> Another view http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#16 71efc8cb-c2b6-4120-ab7f-4014946bb200 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3674.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3674.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Another view</p></div></div> Time to void that warranty. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#17 b7d05cc0-e8d1-49e2-91b9-211657a0582e http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3678.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3678.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Time to void that warranty.</p></div></div> Depress the black tabs to release each corner. You can do them one at a time. You do not need to touch the white tabs. Don’t worry if you accidentally break a white tab, they aren’t important. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#18 7c5a1acc-6198-4d2a-bce4-326136f01029 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3680.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3680.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Depress the black tabs to release each corner. You can do them one at a time. You do not need to touch the white tabs. Don’t worry if you accidentally break a white tab, they aren’t important.</p></div></div> With the back removed http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#19 918d04a0-ad09-4a97-9983-8b654b10acbd http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3682.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3682.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">With the back removed</p></div></div> There are two PCBs joined by a short ribbon cable. To get them out of the case, pull on the long edges of the case to pull the tabs away from the lower board. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#20 259b99f7-1460-441b-90f9-b62410e748c5 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3686.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3686.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">There are two PCBs joined by a short ribbon cable. To get them out of the case, pull on the long edges of the case to pull the tabs away from the lower board.</p></div></div> Another view of the boards http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#21 6a8fb0f7-2fa9-486d-a9bf-6a143f5385bd http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3706.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3706.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Another view of the boards</p></div></div> Top side of interface board http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#22 9a984905-eae3-41d4-b963-d1d6c32d0d8d http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3702.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3702.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Top side of interface board</p></div></div> Bottom side of interface board http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#23 48632ae0-1b41-452e-8e51-c501296b6341 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3696.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3696.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Bottom side of interface board</p></div></div> Top side of logic board http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#24 777b4790-b8c2-40ca-a57f-fdac28074183 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3700.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3700.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Top side of logic board</p></div></div> Bottom side of logic board http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#25 b0615880-a84b-471a-a353-e7929870d043 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3695.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3695.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Bottom side of logic board</p></div></div> Find this chip. It is a 4081. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#26 1a25066f-2e07-45ab-acb9-bc11d28efae2 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3716.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3716.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Find this chip. It is a 4081.</p></div></div> Closer look http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#27 04ca1e0a-892f-439e-945f-88dcc246f5cd http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8602.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8602.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Closer look</p></div></div> Cut these two tracks at the red marks, using a fine needle. You’ll need a good magnifying glass or preferably a stereo microscope. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#28 d4c0d4b2-a728-402e-b04a-eaccf3255f91 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8602%20copy.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8602%20copy.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Cut these two tracks at the red marks, using a fine needle. You’ll need a good magnifying glass or preferably a stereo microscope.</p></div></div> Here’s how it should look. Make sure there’s no copper left in the gap. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#29 cfa3a674-8517-472e-a381-38195443fff0 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8608.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8608.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Here’s how it should look. Make sure there’s no copper left in the gap.</p></div></div> Carefully solder in two fine wires as shown by the blue lines. You must first scrape off all the solder-resistant green coating around each hole. Solder them on the other side of the board too, just to be sure. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#30 8c12840d-04d4-4ca7-9746-470858d1a0e8 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_860222.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_860222.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Carefully solder in two fine wires as shown by the blue lines. You must first scrape off all the solder-resistant green coating around each hole. Solder them on the other side of the board too, just to be sure.</p></div></div> Now locate this chip. It is a 4071. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#31 631ea505-6380-44dd-94fb-f2b5c5b061be http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_371622.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_371622.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Now locate this chip. It is a 4071.</p></div></div> Pins are numbered counterclockwise from 1 at top left to 14 at top right. Heat pin 8, lift away from pad, and solder it to pin 9. Also lift pin 12 from pad and solder to pin 13. Use short bits of wire to avoid bending the pins too much . http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#32 86c1850d-ae19-4ddd-a742-fd2f08683d3f http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8610.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8610.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Pins are numbered counterclockwise from 1 at top left to 14 at top right. Heat pin 8, lift away from pad, and solder it to pin 9. Also lift pin 12 from pad and solder to pin 13. Use short bits of wire to avoid bending the pins too much . </p></div></div> This next bit disables the logic that stops a locker being selected until the previous locker red light comes on. Locate these two transistors. They have two pins on one side, and one pin on the the other side. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#33 91ca3111-d020-49e2-b0cb-85a80f8a86a0 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3700_1.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_3700_1.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">This next bit disables the logic that stops a locker being selected until the previous locker  red light comes on. Locate these two transistors. They have two pins on one side, and one pin on the the other side.</p></div></div> Heat the single pin with a soldering iron, and carefully bend the transistor up and away from the solder pad, leaving the two pins on the other side connected. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#34 0fd73fc7-bf3d-4618-8934-34750a1d3df5 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8612.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8612.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Heat the single pin with a soldering iron, and carefully bend the transistor up and away from the solder pad, leaving the two pins on the other side connected.</p></div></div> Same procedure for both transistors http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#35 997a4d32-4143-4655-a4b5-0976c4b27da0 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8613.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8613.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Same procedure for both transistors</p></div></div> This next bit rewires the ESP disable signal to come on when any locker is selected. It normally only comes on with the center diff. Find this track on the bottom of the interface board (with the connector on it) and cut it. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#36 c22f2485-2421-458e-85af-3d0291d06320 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8620.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8620.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">This next bit rewires the ESP disable signal to come on when any locker is selected. It normally only comes on with the center diff. Find this track on the bottom of the interface board (with the connector on it) and cut it.</p></div></div> Get three diodes, and solder them together like this. Any kind of diode will do, I used IN914. Solder a bit of wire to the middle. You just made a three-input “OR” gate. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#37 18d6c8d5-564c-407a-a266-18ef2342c93b http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8619.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8619.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Get three diodes, and solder them together like this. Any kind of diode will do, I used IN914. Solder a bit of wire to the middle. You just made a three-input “OR” gate.</p></div></div> Solder the ends of the diodes to the tabs of the three transistors shown. These are the drivers for each of the locker solenoids, so now we have a signal that is active when any locker is selected. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#38 1967dd1c-b61b-4759-82cb-e4383fa47744 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8624.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8624.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Solder the ends of the diodes to the tabs of the three transistors shown. These are the drivers for each of the locker solenoids, so now we have a signal that is active when any locker is selected. </p></div></div> Run the other end of the wire through this hole and solder it on the other side. You will need to scrape the green solder-resist off the spot where you solder. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#39 b4a10baa-69da-4bd4-9ed8-b08b69a00d86 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8623.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8623.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Run the other end of the wire through this hole and solder it on the other side. You will need to scrape the green solder-resist off  the spot where you solder.</p></div></div> Put it all back together, and now you can do this. The lockers now operate completely independently. Don’t sue me if you roll off the mountain. http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack.html#40 8a137bda-5a15-466e-b13b-72d38ea67935 http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8618.jpg?derivative=thumb http://www.w5yk.com/Geezer/Diff_Lock_Switch_Pack_files/Media/IMG_8618.jpg?derivative=micro <div style="padding: 0px; " class="image_cluster_layout_style_default_External_268_75"><div class="image_cluster_layout_style_default"><p style="padding-bottom: 0pt; padding-top: 0pt; " class="paragraph_style_2">Put it all back together, and now you can do this. The lockers now operate completely independently. Don’t sue me if you roll off the mountain.</p></div></div>