Question about 2004 Cadillac Deville
The driver side window switch is inoperative. Only the passenger side switch works. I've lost all functions of the driver side switch, (i.e. window, mirror, door lock, and alarm functions). The problem is intermittent at times. One day the switch will light up and all functions work, then minutes later it stops and never works again for months. I was told that there was a door module that controls all of those functions and the cost is well above $300. Any idea what the problem could be? I've checked the door harness inside the boot for potential broken wires, all were fine. Please help!!!!!!!!!!!!!!!!!!!
The thing to do first is have the vehicle hooked up to a professional grade scan tool an have it checked for DTC'S in the driver door module , an to see if the scan tool will talk with the module !
Then if no codes are present check for battery power an good grounds at the module ! You have to take the door panel off the door to get at the module . I have one of these modules out in my tool box , I got it at the auto salvage yard . $10.00
In order to control window operations, as well as other door functions, door modules must be powered up. Battery voltage is supplied by the rear fuse block, through separate circuits, to each door module. Each door module is separately grounded through a ground stake. Additionally, the door modules use these power and ground supplies to provide voltage and ground to their associated window switch, and to provide voltage and ground for door lock operations. The front door modules also use these power and ground supplies to power the window express up sensors, and for outside rearview mirror operation .
How to test computer controlled door locks
Posted on Apr 10, 2015
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Posted on Jan 02, 2017
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