Body Control Module - Ground Information
INFORMATIONBulletin No.: 07-08-47-004B
Date: August 13, 2009
Subject: Information on Body Control Module (BCM) Grounds
Models:
2006-2010 GM Passenger Cars and Light Duty Trucks (including Saturn)
2006-2010 HUMMER H2, H3 Models
2006-2009 Saab 9-7X
Supercede:
This bulletin is being revised to add models, update the model years to 2010 and revise the diagnostic procedure. Please discard Corporate Bulletin Number 07-08-47-004A (Section 08 - Body & Accessories).
The purpose of this bulletin is to inform dealers of the importance of properly protecting the vehicle BCM whenever vehicle service requires a BCM ground to be removed or replaced.
Important
A ground for the BCM may be a component that you are removing to replace or repair such as the Navigation Radio, HVAC Control, Heated/Cooled seat module, or Instrument Cluster.
Notice
Prior to disconnecting a BCM ground (or grounding component), the negative battery cable should be disconnected, or all other connectors at the BCM should be disconnected first. Failure to disconnect the battery ground prior to disconnecting any grounding components (such as the I/P Cluster providing a ground path for the BCM) will result in damage to the BCM.
If the BCM grounds are not connected, damage to the BCM will occur. Other systems controlled by the BCM may also be affected, such as an inoperative or intermittent condition in the following systems:
- Interior lighting will remain on or will not work
- Exterior lighting will remain on or will not work
- Remote keyless entry
- Door locks
- Power windows and mirrors
- Remote vehicle start
- Remote trunk release
BCM grounds can be found in various locations in the vehicle, depending on the model. For example, the BCM ground for 2008-2010 Saturn VUE is the vehicle's instrument cluster. Before any service that requires the instrument cluster to be removed, the negative battery cable should be removed.
Please refer to Ground Distribution Schematics and Component Locator in SI for locations and schematics of the BCM grounds in all vehicles.
The schematic above is for reference only and illustrates the removal of a component such as the Instrument Cluster will remove the ground path to the BCM.
Warranty Information
For vehicles repaired under warranty, use the table above.
Disclaimer