Circuit Outputs
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
In addition to GMLAN and SPI bus commands, the HPCM directly controls the following output circuits:
- ATFP control circuit
- BECM high voltage contactor relay pulse width modulated (PWM) control circuit