Component Testing
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.
Brake Fluid Level Switch
- Inspect the master cylinder reservoir for the proper brake fluid level.
- If brake fluid level is low, refer to Hydraulic Brake System Diagnosis .
- Ignition OFF. Disconnect the brake fluid level switch connector. Measure the resistance between terminal A and terminal B of the brake fluid level switch. Verify that the resistance is greater than 75 k/Ohm.
- If there is less than 75 k/Ohm between terminal A and terminal B of the brake fluid level switch when the master cylinder reservoir is full, replace the brake fluid level indicator switch.
- Remove all of the brake fluid from the master cylinder reservoir. Measure the resistance between terminal A and terminal B of the brake fluid level switch. Verify that the resistance is less than 25 ohms.
- If there is greater than 25 ohms between terminal A and terminal B of the brake fluid level switch when the master cylinder reservoir is empty, replace the brake fluid level indicator switch.
Park Brake Switch
- Ignition OFF. Release the park brake. Disconnect the park brake switch connector. Verify that continuity does not exist between terminal A of the park brake switch and ground.
- If there is continuity between terminal A of the park brake switch and ground when the park brake is released, replace the parking brake indicator switch.
- Apply the park brake. Verify that continuity exists between terminal A of the park brake switch and ground.
- If there is no continuity between terminal A of the park brake switch and ground when the park brake is applied, replace the parking brake indicator switch.