C0161

Part 1 Of 2:

Part 2 Of 2:

CIRCUIT DESCRIPTION
The Stoplamp Switch is a normally open switch, when the brake pedal is depressed, the Electronic Brake and Traction Control Module (EBTCM) senses battery voltage. This allows the EBTCM to determine the state of the brake lamps.

CONDITIONS FOR SETTING THE DTC
^ EBTCM detects battery voltage at all times.
^ EBTCM never detects battery voltage from the stoplamp switch input circuit.
^ Both brake lamps are faulty.

ACTION TAKEN WHEN THE DTC SETS
^ DTC C0161 is set.
^ ABS and TCS remains active.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the Diagnostic Trouble Code (DTC) no longer exists and the scan tool Clear DTCs function is used.
^ 100 ignition cycles pass with no DTC(s) detected.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

^ Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness

^ The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation

^ If an intermittent malfunction exists refer to "General Electrical Diagnostic Procedures" in Diagrams for further diagnosis.


TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
5. This step checks for voltage at the EBTCM.
11. This step checks the Stoplamp switch.