TIPM repaired? Time will tell.
Well, finally had to do something about my TIPM and the dreaded possessed jeep syndrome. About 2 years ago it did the horn, wipers, washers all on thing with the added bonus of not being able to turn the engine off. The fix then was smack the top of the TIPM and all was good. Never had a problem until 2 days ago. This time I was driving down the road at night and it did the same thing again. Pull over smack the TIPM and all is good. Now today it did it 2 times but the second time I did the ‘ol smack it fixed the horn, wipers, etc but now the headlights don't work!
Decided to dismantle the unit to see what could be the problem. This is NOT A SIMPLE TASK and I don't know if its fixed yet. Unless you’re JK is in the garage dead waiting on an endless backorder for a TIPM, do not attempt. That being said I spent about an hour removing the fuses and relays and releasing clips to get to the circuit board. Now what I found was interesting. Most of the board is wave soldered (by machine) but all the pins that connect fuses to the circuit board are hand soldered. Some of these connections didn’t look very good to me so I resoldered them again using leaded solder. I'm not a fan of the ROHs compliance (lead free) and that could be part of the problem. IF you’re thinking of doing this you’ll need a hi heat iron because the tabs are big and absorb a lot of heat.
Anyway, Spent another hour reassembling the unit and installing. Everything works for now…….. I’ll let you know if this fix “holds” at a later date. This is about the only thing I could think of that could cause all these problems. It’s not a complete power failure otherwise the jeep would just die and nothing would work. My thought is part of the computer loses power or ground and it starts getting random input commands to turn on the horn, etc. There’s nothing wrong with the horn, wiper, or washer circuits, they work just fine. It’s the computer tells all this stuff to turn on. Most of the circuit board is assembled by machine and is very solid, its the hand soldering that requires enough heat to get a good transfer of solder, but not so much that you ruin the circuit trace that worries me.
Only time will tell