Circuit/System Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) applies voltage to the high speed GMLAN serial data wake up circuit, when the ignition key is in ACC, ON or START to enable several modules for bus communication.
Depending on option content, modules that may receive the signal are as follows:
- Drive motor generator battery control module (BECM) (RPO HP2)
- Electronic brake control module (EBCM)
- Electronic suspension control (ESC) module
- Fuel pump flow control module (FPCM)
- Power steering control module (PSCM) (RPO HP2)