2002 GMC Yukon automatic door locks

Tiny
BLACKBIRD97
  • MEMBER
  • 2002 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 92,000 MILES
My automatic door locks quit working. They wont lock or unlock. I can press the lock button and nothing happens, but when I press unlock I can hear clicking from he fuse panel inside the car. How can I find out what is wrong?
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Wednesday, September 8th, 2010 AT 12:18 AM

3 Replies

Tiny
FACTORYJACK
  • EXPERT
Is this with the remote as well as the lock switch? When you are attempting unlock, and you hear the clicking, are the doors already unlocked. What happens if you manually lock them and then press unlock? If the work, try swapping the lock and unlock relays in the I/P fuse block, if they now lock, replace the one relay that is now in the unlock cavity.
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Wednesday, September 8th, 2010 AT 10:21 AM
Tiny
BLACKBIRD97
  • MEMBER
It wont lock or unlock with the remote or the switch. Replaced all relays and fuses in both fuse panels under hood and inside car still nothing. With the driver door open the security light stays on solid. As soon as I press the unlock button the security light flashes. I removed the negative battery cable for 1 hour. Hooked it back up door locks still dont work. What to do now? I do have an after market alarm system.
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Thursday, September 9th, 2010 AT 9:34 PM
Tiny
FACTORYJACK
  • EXPERT
The security lock flashing at unlock indicates the factory system is disarmed. An aftermarket alarm does present some other possibilities. Is it the factory keyless transmitters that you use, or the aftermarket ones? If the alarm has an integrated keyless feature, the system has to be tapped into so the alarm module can control the lock/unlock functions. There is no standard on aftermarket installations, it is at the discretion of the installer. Since you hear relays in the I/P fuse block when you activate locks, the vehicles keyless system sounds as though it's functional. With the fact that the aftermarket system is in place, normal vehicle architecture may be affected, and therefor factory information would be useless. The first approach that I take whenever aftermarket equipment is installed, is to remove the aftermarket equipment.
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Monday, September 13th, 2010 AT 10:05 AM

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