C1292

Circuit Description
DTC C1292 determines the proper operation of the brake switch. Proper operation of the brake switch is important because the brake switch activates the ABS when the brake switch is on. If the brake switch is off, the ABS will never activate. This malfunction is only detected when ABS is required because it is difficult to detect the malfunction under normal braking conditions.

Conditions for Setting the DTC
DTC C1292 can set if the vehicle speed is greater than 8 km/h (5 mph). A malfunction exists when the following conditions occur:
- The brake was not ON.
- A release was required on two channels for 0.5 second.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS disables.
- The ABS warning indicator turns ON.

Conditions for Clearing the DTC
- The condition responsible for setting the 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
- The following conditions may cause a malfunction:
- Faulty stoplamp switch (contacts open all the time)
- Loss of two wheel speed sensors at the same time
- Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.
Thoroughly inspect any circuitry that may cause the intermittent 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
- Sticking brake switch

Test Description
3. This test determines if the brake switch signal is being received by the EBCM.
5. This test checks for an open in the brake switch circuit.
7. This test determines if the malfunction is caused by the EBCM.
8. This test checks for voltage entering the brake switch.
9. This test checks for voltage exiting the brake switch.
12. This test checks for an open in the brake switch input circuit.
14. This test checks for an open in the battery feed circuit.
15. This test checks for a short to ground in the battery feed circuit.