Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) controls the Ignition 1 (IGN 1) relay. The contacts of the IGN 1 relay deliver a B+ signal to the following components:
- The ABS Functions
- The AC compressor relay
- The Crank relay
- The HVAC control head
- The IPC
- The PCM
- The SDM
- The Transmission solenoids
The BCM will energize the IGN 1 relay when the vehicle is in the RUN or CRANK power mode. The BCM supplies a B+ signal to the relays control circuit to energize it. The relays control circuit receives it's ground from G113. If a short or circuit malfunction takes place in the IGN 1 control circuit the BCM will set a B1428 and the relay will not energize.