Circuit Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 antilock brake system (ABS) functions
- The AC compressor relay
- The crank relay
- The HVAC control head
- The instrument panel cluster (IPC)
- The powertrain control module (PCM)
- The sensing and diagnostic module (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.