2010 Cadillac Truck SRX FWD V6-3.0L Page 758
Conditions for Clearing the DTC
* A current DTC clears when the diagnostic runs and passes.
* The EBCM will turn OFF the indicator in the next ignition cycle.
Reference Information
Schematic Reference
Hydraulic Brake Schematics (See: Brakes and Traction Control/Hydraulic System/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Brake Assist System Description and Operation (See: Brakes and Traction Control/Hydraulic System/Description and Operation/Brake Assist
System)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition OFF, apply and release the brake pedal several times to ventilate the brake booster.
2. Engine running, the M9 Brake Booster Pump Motor should turn ON for a short time.
Circuit/System Testing
1. Inspect the brake booster vacuum system for damage, leakage and correct installation. Refer to Brake Assist System Diagnosis (See: Brakes
and Traction Control/Hydraulic System/Testing and Inspection/Component Tests and General Diagnostics/Brake Assist System Diagnosis).
2. If the brake booster vacuum systems diagnoses normal, disconnect the harness connector at the M9 Brake Booster Pump Motor.
3. Ignition OFF, test for less than 5 ohm between the ground circuit terminal 2 and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance.
4. Disconnect the KR28 Vacuum Pump Relay.
5. Ignition ON, verify that a test lamp illuminates between the circuit terminals listed below and ground.
* Relay coil ignition terminal 86
* Relay switch ignition terminal 87
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
6. Verify that a test lamp does not illuminate between the relay controlled output circuit terminal 30 and ground.
瀚慖f the test lamp illuminates, test the controlled output circuit for a short to voltage.
7. Verify that a test lamp does not illuminate between the relay control circuit terminal 85 and ground.
瀚慖f the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K17 Electronic Brake
Control Module (EBCM).
8. Ignition OFF, connect the harness connector at the M9 Brake Booster Pump Motor.
9. Momentarily connect a 20 A fused jumper wire between the vacuum pump relay controlled output circuit terminal 30 and B+. Verify the M9
Brake Booster Pump Motor activates.
瀚慖f the M9 Brake Booster Pump Motor does not activate and the vacuum pump motor fuse is open, test the controlled output circuit for a
short to ground or an open/high resistance. If the circuit tests normal, test or replace the M9 Brake Booster Pump Motor.
