C1294

CIRCUIT DESCRIPTION
This Diagnostic Trouble Code (DTC) is run to determine the proper operation of the stoplamp switch, which detects that the stoplamp switch is closed at all times or there is a short to voltage in the stoplamp switch input circuit to the Electronic Brake Control Module (EBCM).

CONDITIONS FOR SETTING THE DTC
^ Diagnostic Trouble Code (DTC) C1294 can set if the vehicle's speed is greater than 40 km/h (25 mph).
^ A malfunction exists if the brake was always on during two consecutive drive cycles.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction Diagnostic Trouble Code (DTC) stores.
^ ABS operation remains functional.

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 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

DIAGNOSTIC AIDS
Inspect for the following when diagnosing this system:
^ Stoplamp switch out-of-adjustment
^ Faulty stoplamp switch (contacts always closed)
^ Stoplamp switch input circuit shorted to battery

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.

TEST DESCRIPTION
3. This test isolates the cause of the malfunction to either a faulty or misadjusted brake switch, or a short to voltage in the brake switch circuit.
5. This test checks for a resistive short to voltage in the brake switch circuit.
7. This test determines if the malfunction is caused by the EBCM.

Part 1 Of 2:

Part 2 Of 2:

DTC C1294 BRAKE LAMP SWITCH CIRCUIT ALWAYS ACTIVE