Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the brake fluid has the proper level. The fluid level should be above minimum level.
- If low
  Refer to Brake Fluid Loss .
- If above minimum level
Ignition ON.
Verify the scan tool Brake Fluid Level Sensor parameter. The reading should be Ok.
- If the parameter is Low
  Refer to Circuit/System Testing
- If the parameter is Ok
Verify the scan tool Park Brake Switch parameter changes between Applied and Released while applying and releasing the parking brake.
- If the parameter does not change
  Refer to Circuit/System Testing - Park Brake Switch Malfunction.
- If the parameter changes
Verify the brake warning indicator turns ON and OFF, when commanding the instrument cluster All Indicators On and Off with a scan tool.
- If the brake warning indicator does not turn ON and OFF
  Replace the P16 Instrument Cluster.
- If the brake warning indicator turns ON and OFF
All OK.