Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Verify the M9 Brake Booster Pump Motor turns ON and OFF when commanding the Brake Booster Electric Vacuum Pump On and Off with a scan tool.
- If the M9 Brake Booster Pump Motor does not turn ON and OFF
  Refer to Circuit/System Testing.
- If the M9 Brake Booster Pump Motor turn ON and OFF
Verify that the brake booster vacuum system has no damage, leakage or incorrect installation.
- If damage, leakage or incorrect installation is found
  Refer to Brake Assist System Diagnosis .
- If the inspection is OK
All OK.