Circuit/System Testing

WARNING: This page is about a different car, the 2015 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 Q73 Brake Booster Solenoid Valve and disconnect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
Test for less than 1 V between each Q73 Brake Booster Solenoid Valve harness connector terminals listed below and ground.
- 12V reference circuit terminal 3
- Low reference circuit terminal 4
- If 1 V or greater
  Repair the short to voltage on the circuit.
- If less than 1 V
Ignition OFF.
Test for infinite resistance between each Q73 Brake Booster Solenoid Valve harness connector terminals listed below and ground.
- 12V reference circuit terminal 3
- Low reference circuit terminal 4
- If less than infinite resistance
  Repair the short to ground on the circuit.
- If Infinite resistance
Test for less than 2 Ω between each harness connector terminal listed below end to end.
- Q73 Brake Booster Solenoid Valve - terminal 3 and K17 Electronic Brake Control Module terminal 7
- Q73 Brake Booster Solenoid Valve - terminal 4 and K17 Electronic Brake Control Module terminal 31
- If 2 Ω or greater
  Repair the open/high resistance in the circuit.
- If less than 2 Ω
Connect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
Clear the DTC, verify the DTC sets.
- If the DTC did not set
  Replace the Power Vacuum Brake Booster.
- If the DTC did set
Program the EBCM.
1. Verify the DTC does not set.
  - If the DTC sets, replace the EBCM.
  - If the DTC does not set
All OK.