Question about 2002 Buick Rendezvous

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The power door locks, windows, interior lights, and radio all stopped working on my 2002 Rendezvous. One morning my key fob would not unlock the car and so I did it manually and the security light stayed on and now all of those things mentioned do not work. I tried replacing the battery in the key fob and we checked all of the fuses, which are fine. We had two different places run diagnostics on it and they say nothing shows up as being wrong. Help! Thank you, L. Hall

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  • Buick Master
  • 12,152 Answers

What kind of place did the diagnostics ? Auto part stores ? The BCM - body control module . Takes a proessional or factory scan tool to pull codes from this module .
The body control module (BCM) is capable of accomplishing multiple body control functions. Components directly connected to the BCM are controlled by the BCM outputs. The BCM can control its outputs based on input information it obtains from sensors and switches that are directly connected to the BCM, or by receiving information from other vehicle systems connected to the class 2 serial data link. The BCM evaluates this information and controls certain body systems by commanding an output on or off.
The BCM is also capable of commanding other vehicle systems to control functions that are not directly wired to and/or controlled by the BCM. The BCM accomplishes this task by sending specific messages on the class 2 serial data link. The vehicle system capable of performing such function will respond to the BCM message.
The BCM controls/monitors the following functions:
• Audible warnings
• Indicators control
• Interior lighting
• Exterior lighting
• Power/automatic door locks
• Keyless entry
• Content theft deterrent
• Personalization
• Serial Power Modes
• Electrical Power Management

Hooking up a Tech 2 factory scan tool to see if the BCM will communicate would be the first step in diagnosing this problem ,also checking codes an to see if the scan tool can bidirectionally control the lock's window's etc.. I would suggest a buick dealer !

Posted on Jun 10, 2017

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Posted on Jan 02, 2017

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SOURCE: replaced ignition and steering wheel now car wont start -security light on

Hi......
On your Buick 94.
The problem is the ANTI THEFT SYSTEM..
If you have replaced the ignition switch.
If you are using a NEW KEY, the car won't start.
Because in the OLD KEY, is there a Resistence with a number of ohm's
The computer need the resistence to activate the the signals to operate the vehicle.
OK.. with the New Key and Old Key you can go to any Aloha Smith and they will remove the Chip from the Old Key to the New Key.
And the car must start and running.

But if you are using the Same Key that you have before the repair made.
I recomend to check the 2 Orange wires from the Ignition lock Cylinder to the steering column lower connectors.

Ok I hope this work for your problem.
Any moree info, I will glad to help you.
I'm a Mechanic and have all the repair information for all the cars.

Thank you for use fixya...

Posted on Sep 11, 2008

  • 840 Answers

SOURCE: Interior lights won't turn off 1999 BuicK LeSabre.

yes there is a relay switch in engine compartment or under dash

Posted on Jan 25, 2009

  • 17 Answers

SOURCE: new starter will not crank 1994 buick regal custom

check your nuetral safety switch

Posted on Apr 09, 2009

  • 107 Answers

SOURCE: buick rendezvous remote reciever in rear door

check for power to solenoid , repair wiring or replace solenoid (actuator)

Posted on Jun 27, 2010

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