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Information on Body Control Module (BCM) Grounds

Subject:Information on Body Control Module (BCM) Grounds

Models:2006-2007 Buick Lucerne
2006-2007 Cadillac DTS, Escalade Models
2007 Cadillac SRX
2006-2007 Chevrolet Impala, Monte Carlo
2007 Chevrolet Avalanche, Equinox, Silverado, Suburban, Tahoe
2007 GMC Acadia, Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2007 Pontiac Torrent
2007 Saturn OUTLOOK



The purpose of this bulletin is to inform dealers of the importance of properly installing and verifying BCM grounds whenever a BCM is serviced or replaced.

Notice: Prior to disconnecting a BCM ground, the negative battery cable should be disconnected, or all other connections to the BCM should be disconnected first. Failure to disconnect all powered connections prior to disconnecting the ground may result in damage to the BCM.

If the BCM grounds are not correctly installed, damage to the BCM may occur. Other systems controlled by the BCM may also become inoperative or intermittent:

    • Interior lighting
    • Remote keyless entry
    • Door locks
    • Power windows and mirrors

To verify BCM ground, first visually inspect the ground connection. Then use a digital multimeter (such as J 39200, J 39688 or equivalent) to perform a ground check from connector terminals C3-1 and C3-5 of the BCM to ground (with the C3 connector disconnected from the BCM).