Originally Posted by James1549
Back to square one. The owner told me he operated the top up and down at least 5 times more the same day he left with no problem. Parked the car for one week, the partition switch is still bypassed, the top won't work again.
Open the latch, the windows go down. Hit the switch, beeps. Trunk is not locking.
Not sure when I will be able to get back to it, but I still am looking for answers to try.
James
Ok, let's look at what we DO know:
1) The Latch Switch in the windshield frame is ok, the ground it applies to the TCM causes the TCM to command the BCM to lower the windows.
The above tells us that: The TCM and BCM are capable of communicating with one another. This tells us that, essentially, both module's microprocessors are alive and well. (Not that the whole module is good, but such is most likely). This also tells us that the fuses that supply battery power to those modules are ok. We know you are not going over 9mph, so the BCM should allow the TCM to lower the top. AND, since we have determined that the modules are talking to one another, I think it's safe to assume that the BCM is not "lying" that you are going over 9mph.
Ok...
The next item required to make stuff happens is that we need a ground on pin 7 of Connector C1 on the TCM. How do we get the ground? The Roof open switch and the cargo divider switches work together to do this. (You have supplied pictures of BOTH in an earlier post).
Now, look for a brown and black wire that goes from C1 pin 7 on the TCM to harness connector C301's pin 3 (should be near the TCM but may be connector on the passenger side of car near the top linkages) and becomes a black wire. This wire enters a harness and goes up the passenger side of the top, to the "ROOF OPEN SWITCH". If the switch is allowed to relax (when you open the top) the switch closes, connecting the other black wire on that switch, which THEN goes back to Connector C301 pin 2 and becomes a brown and black wire. THIS wire then goes to the "CARGO COMPARTMENT DIVIDER SWITCH". If pressure from the divider hook presses on this switch, it closes, connecting the BROWN wire on that switch to the brown and black wire. The brown wire goes directly to ground, to a bolt that also has the brown wire from the rear bow switch and the brown wire from the TONNEAU COVER SWITCH on it as well.
WHAT WOULD I DO? If the top refuses to work, leave it unlatched from the roof and open the trunk (since it won't lock anyway). Take the trim away from the driver side and get access to the TCM.
See page 8W-80-51 if the manual. C1 is shown. Measure the voltage on pin 7 of C1.
If the top open switch and divider switch have both closed, there HAS to be zero volts (that is, a ground) on this pin. IF THERE IS A GROUND HERE, then the TCM might be bad!
If there IS NOT a ground here, then the divider switch or roof open switch are bad OR SOMEWHERE the wires I described above have opened. It is POSSIBLE that with all the flexing over the years, we have a broken wire (they can be broken internally without appearing bad on the outside).
I realize getting to the TCM is a pain, but it is the key to figuring this out.
ONE OTHER THING You also need a "trunk closed" indication from the BCM to allow the electric lock to activate and things to start happening. This indication is provided by a switch in the trunk, but I have not found it in the manual, yet. Gimme a day or two!