Originally Posted by
bossman4
I clipped the Pin 16 wire near the PTCM module so there is now an open circuit on the latch retainer switch(Trunk lid should have indicated closed on the DRB III emulator after I clipped it and removed the "ground"). The clipping of this wire should have eliminated the wiring loom as the source of the grounding at Pin 16 of the PTCM. It still did not indicate trunk lid closed in the DRBIII emulator after this change, indicating to me that some sort of grounding or malfunction was occurring in the PTCM itself.
Am I making the right conclusion?
NO. You are not right, not at all. You are CLOSE, but you are still wasting your time.
DO EXACTLY THIS:
1) Grab a toggle switch, a simple on/off switch, and some wire.
2) Wire it up and connect one wire to ground in the trunk, make sure it is a clean ground and dont clip onto a painted surface.
3) DO NOT connect the other wire to pin 16 yet.
4) Start engine, put both driver and passenger window up.
5)Use your DRB thingy, and read the sensor indication.
5A) Connect the wire on the switch that you left free, to pin 16 of PTCM.
5B) Did the windows go down.
5C) Did the DRB tell you that it saw the sensor change state?
6) Flip the switch.
6A) DId the windows go down?
6B) Did the DRB tell you that it saw the sensor change state?
TAKE NOTES as to items 5a,5b,5c and 6a, 6b of what happened or didn't happen - this is what tells us what the PTCM is thinking.
THIS will tell you what is going on. The DRB MUST show a change of state OR the windows MUST go down.
IF NEITHER HAPPENS, the PTCM is bad. If EITHER HAPPENS, the PTCM is apparently OK and we have more detective work to do.
MY POINT:
No test is a real test unless you can witness a change of state with your DRB - that is basic electronic troubleshooting. You MUST be able to WITNESS the DRB report a change of state due to the status of pin 16.
ANY change of state (windows go down or DRB shows a change of state) is what we want.
