DTC C0161
Diagnostic Instructions
DTC Descriptor
DTC C0161 00: Antilock Brake System (ABS) Brake Switch Circuit
Circuit/System Description
The normally-open brake lamp switch supplies battery voltage to the engine control module (ECM) when the brake pedal is pressed. The ECM sends a brake pedal applied serial data message to the electronic brake and traction control module and to the transmission control module (TCM).
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
• | The EBCM detects an open in the brake signal circuit. |
• | Both brake lamps are faulty. |
Action Taken When the DTC Sets
• | The EBCM stores this information only code DTC for as long as the condition is present. |
• | The ABS remains functional. |
Conditions for Clearing the DTC
• | The condition for the DTC is no longer present. |
• | The DTC is cleared with a scan tool. |
• | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
• | A signal circuit of the brake lamp switch is open. |
• | The brake lamp switch is improperly adjusted. |
• | All brake lamps are open. |
• | All brake lamp grounds are open. |
• | An open or high resistance in the EBCM ground |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Apply and release brake pedal. Verify brake lamps operate properly.
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