Question about 2002 GMC Envoy

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Where is the body control module located in 2002 gmc envoy?

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It's under your back seat. See here for picture http://www.ebay.com/itm/like/261068608953?lpid=82
Here is the relearn procedure which you have to perform so the new BCM will recognize your key and start the car:
For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.
You can pick one oif these up for $20 or less at a junkyard. For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.

Posted on Dec 13, 2014

  • 2 more comments 
  • Joe Colella
    Joe Colella Dec 13, 2014

    how do I know when the bcm and the pcm are communicating with eachother

  • Joe Colella
    Joe Colella Dec 13, 2014

    and also is this procedure used?

  • Joe Colella
    Joe Colella Dec 13, 2014

    Is this procedure used by the dealer when they say this has to be programed.

  • Ali Galam
    Ali Galam Dec 13, 2014

    This is to reprogram the BCM to accept the key which has a chip in it for anti theft. Iam not aware of any other programming that needs to be done to the BCM.

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where is the body control module located in 2002 g - 25319485-qoae4qohkujtync2nmxeup2w-3-0.gif
It's under the back sit in driver side located in a black box looks like battery box

Posted on Dec 13, 2014

Testimonial: "very helpful and prompt in his reply..many thanks"

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You can't just pull it out and pop one back in. What problems are you having?

Posted on Dec 13, 2014

Testimonial: "Well I can't program a remote. rear wiper won't work. interior lights do not work when opening the door"

  • Randy Ohler Dec 13, 2014

    The lights and the remote diffinitely could be the BCM. The rear wiper has to be tested. Most time the wiper motor is dead. And I believe yours has a wiper module in the hatch, some times these go bad. And it does connect to the BCM, But rarely have I fixed a BCM for the wiper. First thing to do is uplug the plugs on the BCM and inspect the plugs and BCM pins for corrosion. Battery terminal cleaner works good on this. Don't get carried away with it on the BCM, because it is not sealed. Also check for dry spots from liquid being spilled on it. If it looks like there has been, then pull it out and take the case of the PC board. Clean any corrosion from the board using brake clean and a soft brass brush or a firm tooth brush. Wipe it down dry with a cloth. Plug it back it and see if its works, before you put it back together. Don't let it contact metal. If it works your done, reassemble it. If not, unplug it and look at the plugs/individual connects. Look to see that they are all the same. Sometimes they swell and loose contact with the pin. If hard to see them, the colored part in the plug pops out with a small screwdriver. I have fixed many BCM's by cleaning the corrosion of the plugs and the PC board.

  • Randy Ohler Dec 13, 2014

    Something I forgot. On the plugs when using battery cleaner. You have to clean this out before you plug them back in. Use brake clean and blow them out with air or let them dry.

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1 Answer

No on lights tails envoy 2002


Check fuse's in the rear fuse box. LR PARK fuse #14 10A - RR PARK #17 10A - Fuse Block - Rear Beneath the left rear seat
An the park lamp relay #30 in same rear fuse box , Do you know what a BCM - body control module is ?
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Where is the body control module located for 2004 envoy


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Roy

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