2010 Cadillac CTS Sedan AWD V6-3.6L Page 696
Brake Warning System Description and Operation (See: Brakes and Traction Control/Hydraulic System/Description and Operation/Brake
Warning System Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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. Inspect for proper brake fluid level, the fluid level should be at or above the proper level.
瀚慖f low, refer to Brake Fluid Loss (See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related
Diagnostic Procedures/Brake Fluid Loss).
2. Ignition ON, observe the scan tool IPC Brake Fluid parameter. The reading should be OK.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the brake fluid level switch.
2. Test for less than 1 ohm between the ground circuit terminal A and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool IPC Brake Fluid parameter is Ok.
瀚慖f not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the IPC.
4. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool IPC Brake Fluid parameter is Low.
瀚慖f not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
IPC.
5. If all circuits test normal, test or replace the brake fluid level switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Brake Fluid Level Indicator Switch Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Fluid Level
Sensor/Switch/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for IPC replacement, setup, and programming
C0277
DTC C0277 or C0890
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0277 06
- Brake Pedal Position Sensor Circuit Short to Ground or Open
