| Subject: | Information on Body Control Module (BCM) Grounds |
| Models: | 2006-2007 Buick Lucerne |
| 2006-2007 Cadillac DTS, Escalade Models |
| 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 |
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:
| • | 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).
