Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector at the brake fluid pressure sensor.
Test for less than 2.0 ohms of resistance between the low reference circuit terminal 1 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
Ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 3 and ground.
- If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
Verify the scan tool Brake Fluid Pressure Sensor is less than 0.2 volts.
- If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the EBCM.
Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 volt reference circuit terminal 3. Verify the scan tool Brake Pressure Sensor Input is greater than 4.7 volts.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
If all circuits test normal, test or replace the brake fluid pressure sensor.