C1292
DTC C1292: Open Brake Lamp Switch Circuit When ABS Was Required (Part 1 Of 2):
DTC C1292: Open Brake Lamp Switch Circuit When ABS Was Required (Part 2 Of 2):
DTC C1292: ABS Schematic:
Circuit Description
This DTC determines the proper operation of the stoplamp switch to detect an open in stoplamp switch circuit. Since this malfunction is difficult to detect under normal braking conditions, this malfunction is only detected when ABS is required.
Conditions for Setting the DTC
This DTC will set when the Electronic Brake Control Module (EBCM) detects that the brake was not ON and a release was required on two channels for 0.5 seconds.
This DTC can be set at vehicle speed greater than 8 km/h (5 mph).
Action Taken When the DTC Sets
A malfunction DTC is stored, ABS is disabled, and the amber ABS indicator lamp is turned ON.
Conditions for Clearing the DTC
^ Conditions for the malfunction are no longer present and the Tech 2 scan tool Clear DTC Information function is used.
^ One hundred drive cycles have passed with no malfunctions detected.
Diagnostic Aids
The following list contains items that need to be inspected when diagnosing this system:
^ Faulty stoplamp switch (contacts open all the time).
^ Loss of two wheel speed sensors at the same time.
An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.
The frequency of the malfunction can be checked by using the Enhanced Diagnostic function of the Tech 2 scan tool, as described in Enhanced Diagnostics.
Inspect the following harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness before component replacement:
^ EBCM connector C1.
^ Stoplamp switch connector.
Test Description
Numbers below refer to numbers on the diagnostic table.
3. Checks the EBCM's stoplamp switch status with a scan tool.
5. Checks for an open in CKT 20A/B/C/D/G.
7. Checks for power to stoplamp switch.
8. Checks stoplamp switch contacts (close with brake pedal pressed).