Question about 2002 Buick Rendezvous

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The electrical systems have all gone crazy. Windows, engine lights, head lights, power locks won't function properly. I disconnected the battery and reconnected it to try and force a reset of the control system. Nothing is working.

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  • Anonymous Aug 22, 2008

    The dome lights stay on while driving even when the switch is set to off.

    All of the doors are shut.

    I unpluged the conection from the back of the lighting control unit, all of the lights turn off, except for the dome lights.

    They do turn off, while parked, after the 10 minute shut off cycle.

    There is a "Astro Start" installed on the car.

  • lemondriver Sep 03, 2008

    I have that sae problem. the car starts and runs fine, but the dash lights and gages and the radio, just go off and on repeadetly...

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I can also be your BCM (Body Control Module), I had mine go and my radio would go off, my windows would not work, ac would turn off, locks would go nuts etc...

Posted on Sep 23, 2008

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90% probability you gave a ground wire issue at your fuse/relay panel. Most of the relays work off the same ground wires and you have relays for a majority of those "gone crazy" items.

Posted on Aug 03, 2008

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Battery drains until dead recharged it tahoe starts and runs gauges are dead alt light is on door locks, windows, keyless entry don't work 2003 tahoe 5.3 please help


Try disconnecting your alternator. Charge the battery but leave the alternator disconnected (remove the electrical plug from the rear of the alternator).

If the battery retains its charge and can start the car (you won't cause any damage by starting the engine with the alternator disconnected) it points towards a defective alternator.

If the rectifier pack - the diodes - in the alternator burn out this can cause a battery to discharge very quickly. Sometimes, quite literally, in a couple of minutes.

If the battery still discharges with the alternator disconnected this points towards a failing battery or a drain somewhere else in the electrical system.

It may be that your door locks and windows don't work for the simple reason there's not enough power to operate them. However, as you say your gauges are dead .. this could possibly point towards a drain in the electrical system, but not necessarily so.

It becomes too easy to replace parts one after the other in the hope that a fault is cured. This is an expensive way of going about things. The best option is to pay a workshop or an auto electrician to diagnose the fault correctly. Diagnose the fault first - an auto electrician will be able to tell you within minutes if it's the battery, the alternator or a drain elsewhere.

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My 2002 Buick Rendevous would not start three times, then on the 4th time it started. Now the security and SES light is flashing. The windows won't roll down, radio is locked, door locks won't...


Given the amount of electronic's ( computers ) on your vehicle ,it could be a lot of thing's . Hooking up a factory or professional grade scan tool that can communicate with all the control modules on the vehicle should be the first step in the diagnostic problem . Checking for DTC'S - diagnostic trouble codes , communication between module errors etc.....
Your best bet , take it to a qualified repair shop that has the proper diagnostic equipment to check it out .
The power door lock system consists of the following components:
• Body control module (BCM)
• Driver door lock switch
• Front passenger door lock switch
• Door lock actuators in each of the doors
• Door lock system fuse into the BCM (BCM D 25A fuse)

BCM Functions
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
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Buick Class 2 Operation Diagnosis 1998

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2004 Jeep Grand Cherokee Laredo: electrical system starting to fail?? Hi! I hope someone can point me in the right direction :) I have a 2004 JGC-L that I LOVE, but the electrical system seems to be...


note that you never once said car can be driven? why?
job1, can you do job 1?
battery is going dead
if head lamps are dim its battery going dead, (not dash HEADs?)
notice is did not say battery was bad only discharged.

if engine starts is charge.battery lamp glowing.
i engine is dead, can crank it.
get a jump, call AAATOW
or find a loaned battery that is charged.
buy a battery charger and use it.

also cars can have phantom drains, as you sleep battery goes dead. (ask)

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If the alternator is charging properly, then you have a drain on the system that could come from anything eclectically powered, you will need to start by removing the fuse to the radio and/or clock, then connect a test light from the negative post on the battery to the battery cable (negative battery cable disconnected positive connected), if the light comes on, you have a drain and will need to start pulling and replacing fuses one by one to isolate the affected system, if the test light has not gone off while pulling fuses, you may have a drain coming from the alternator or starter and will have to disconnect those.

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I will bet the check engine light comes on as well?

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When the armed Vehicle Theft Security System (VTSS) senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed after the battery is reconnected. The alarm can be disarmed by locking the vehicle and turning the drivers door lock to the lock (arm) position. Wait a few minutes then unlock (disarm) the drivers door and the vehicle should start.
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  • Headlamps Inoperative
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Section 11-05: Steering Column Switches 1996 Escort, Tracer Workshop Manual
REMOVAL AND INSTALLATION Multi-Function Switch
Removal
  1. stf~us~en~file=ani_caut.gif~gen~ref.gif WARNING: THE ELECTRICAL CIRCUIT NECESSARY FOR AIR BAG DEPLOYMENT IS POWERED DIRECTLY FROM THE BATTERY. TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BATTERY GROUND CABLE MUST BE DISCONNECTED PRIOR TO SERVICING OR REPLACING ANY AIR BAG SYSTEM COMPONENTS.
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