Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the master cylinder reservoir for the proper brake fluid level.
- If brake fluid level is low, refer to Hydraulic Brake System Diagnosis .
- Ignition ON. With the scan tool, select Instrument Panel Cluster, Special Functions, Display Test. Command the instrument panel indicators OFF. Verify that the brake warning indicator turns OFF.
- If the brake warning indicator does not turn OFF, replace the IPC.
- Disconnect the brake fluid level switch connector. With a scan tool, observe the Brake Fluid Level Switch parameter. Verify that the scan tool Brake Fluid Level Switch parameter is OK.
- If the scan tool Brake Fluid Level Switch parameter is OK, replace the brake fluid level switch.
- Test the brake fluid level sensor signal circuit for a short to ground. Verify that the brake fluid level sensor signal circuit is not shorted to ground.
- If the brake fluid level sensor signal circuit is shorted to ground, repair the circuit.
- Replace the IPC.