Circuit Description
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
The PCS On indicator is controlled by the instrument cluster via class 2 serial data messages from the EBCM. When the instrument cluster sees the PCS signal input grounded, it sends a class 2 message to the EBCM that tells the EBCM that the PCS is malfunctioning. The EBCM then disables PCS and TCS and sends a message to the instrument cluster to turn the PCS and TCS indicators ON. Each time the ignition is cycled from OFF to ON, the PCS is enabled:
The following conditions will cause the PCS/TCS indicators to illuminate:
- No signal received from the EBCM.
- The instrument cluster PCS indicator bulb is blown.
- Harness connector malfunctioned.