wallabybob
New Member
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- Feb 1, 2018
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Thread shifted from 105FSM
Probably not the right place to discuss this Rob - but here goes anyway.
The rear wiper does not work at all until either one of the rear doors or the tailgate
are opened - then it all works fine (even the delayed wipe) but as soon as the door is closed
the wiper loses its 12v feed and stops after self parking - it's looking more and more like
an Instrumentation ECU fault dammit !!!
Pop a new thread up under the 105 section Bob, you’ll get more responses especially if you title it ‘Rear wiper only works with door open’. Have you checked the loom as above, it will almost certainly be where there is a break in the wire.
Rob, I think you are missing the point here, the wiper works fine if either of the rear passenger doors or the tailgate are opened - I can simulate the fault by operating the latch in the tailgate with the door in the open position - that rules out the wiring in the tail gate because it works (and doesn't work depending on the latch condition) There is 12 volts present to run the wipers until all 3 door are closed then it disappears. From the schematic in the FSM (and thanks for that) the courtesy light switches are commoned and send a signal to the
instrumentation ECU to switch on the courtesy lights and the open door indicator light on the dash. The 12 volts for the wiper motor is switched on and off by this ECU but in this case the operation is opposite to expectation.. I will attack the ECU when I get a chance and see what I can come up with. There was a similar thread (exactly the same symptoms) on the LCOOL forum some time ago but I cannot find it now so whether it was resolved or not - I know not!
Regards Greg
Probably not the right place to discuss this Rob - but here goes anyway.
The rear wiper does not work at all until either one of the rear doors or the tailgate
are opened - then it all works fine (even the delayed wipe) but as soon as the door is closed
the wiper loses its 12v feed and stops after self parking - it's looking more and more like
an Instrumentation ECU fault dammit !!!
Pop a new thread up under the 105 section Bob, you’ll get more responses especially if you title it ‘Rear wiper only works with door open’. Have you checked the loom as above, it will almost certainly be where there is a break in the wire.
Rob, I think you are missing the point here, the wiper works fine if either of the rear passenger doors or the tailgate are opened - I can simulate the fault by operating the latch in the tailgate with the door in the open position - that rules out the wiring in the tail gate because it works (and doesn't work depending on the latch condition) There is 12 volts present to run the wipers until all 3 door are closed then it disappears. From the schematic in the FSM (and thanks for that) the courtesy light switches are commoned and send a signal to the
instrumentation ECU to switch on the courtesy lights and the open door indicator light on the dash. The 12 volts for the wiper motor is switched on and off by this ECU but in this case the operation is opposite to expectation.. I will attack the ECU when I get a chance and see what I can come up with. There was a similar thread (exactly the same symptoms) on the LCOOL forum some time ago but I cannot find it now so whether it was resolved or not - I know not!
Regards Greg