Circuit Description
If DTC C1291 or DTC C1292 failed during the last ignition cycle, DTC C1293 becomes a current failure during the next ignition cycle. DTC C1291 and DTC C1292 will remain in history. DTC C1293 failure keeps ABS disabled until identifying a brake switch ON state.
Conditions for Setting the DTC
DTC C1293 alone indicates DTC C1291 or C1292 occurred previously, but is intermittent.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | ABS is disabled until the EBCM receives a valid input from the brake switch. |
| • | 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.
Diagnostic Aids
Use the Data List of the Scan Tool verify proper brake switch operation. The Data List should display the brake switch status change as the brake is applied within 25 mm (1.0 inch) of brake pedal travel.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Is DTC C1291 or DTC C1292 set as either a current and/or a history DTC? | -- | Go to DTC C1291 Open Brake Lamp Switch Contacts During Deceleration or DTC C1292 Open Brake Lamp Switch When ABS Was Required | Go to Step 3 |
3 |
Did DTC C1293 clear? | -- | Go to Step 4 | |
4 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
