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power window circuit
#1
Posted 01 March 2005 - 10:00 PM
Except for front driver side, power windows ain't happening at the drivers switch. All of the motors test good off an independent power source, and are known good.
Parts that have been subsituted and believed to be good include fusible link, fuse, breaker unit, power relay unit, control unit, master switch and individual window switches.
Power is present at the relay, so breaker and relay are assumed to be good.
This would naturally point to the control unit, but I did swap it out with another unit , and 2 bad ones in a row seem kinda unlikely.
Any ideas anyone?
thanks, John
#2
Posted 02 March 2005 - 01:52 AM
i find that if any of the doors are unplugged from the body harness, none of the windows will work. if one switch on one door is disconnected then that window wont work from the master switch.
seeing that you have only one window not working i would check for continuity from the switch plug in to the body plug in if you havent already
#3
Posted 02 March 2005 - 02:46 PM
try checking the wiring in the door itself, between the window harness and the switch itself. so you know the swithc and motors are good
i find that if any of the doors are unplugged from the body harness, none of the windows will work. if one switch on one door is disconnected then that window wont work from the master switch.
seeing that you have only one window not working i would check for continuity from the switch plug in to the body plug in if you havent already
Good call. I have checked each motor with a power supply, and also swapped out switches, but haven't checked the wiring between components yet.
John
#4
Posted 02 March 2005 - 07:34 PM
Good Luck!
#5
Posted 03 March 2005 - 09:31 AM
This would also support Fox's theory about the other windows being out of commission. Strange that they would design the circuit this way. Seems like it would be a safety hazard in an emergency situation if all the windows would be disabled if there was only a problem with one of them.
Hopefully, I'll have this mystery solved later tonite.
John
#6
Posted 04 March 2005 - 08:52 AM
Bad master switch, bad door switch, weak motor.
All the wiring had continuity, and the control unit & relay turned out to be good.
The motor really threw me since it seemed to work ok off an independent power supply. However, when tied into the cars wiring, it became obvious that the motor was hosed. Substituting another one verified it immediately.
Thanks for all the input guys
John
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