Circuit Description
This DTC is the second portion of DTC C1291 and C1292. If DTCs C1291 or C1292 occurred during the last drive cycle, DTC C1293 becomes a current malfunction during the next ignition cycle, keeping ABS disabled until a Stoplamp Switch ON state is seen.
Conditions for Setting the DTC
DTC C1293 alone indicates DTC C0091 or C0092 occurred previously, but is intermittent, or has been corrected.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | ABS is disabled until the EBCM receives a valid input from the brake switch. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | When a change is seen during an ignition cycle in which DTC C1293 is a current malfunction, DTC C1291 or C1292 will clear itself at the end of the current ignition cycle and ABS will enable itself at the start of the next ignition cycle. |
Diagnostic Aids
Use the Data Display function of the Scan Tool to verify proper brake switch operation. The Data Display function should display the brake switch as the brake is applied within 25 mm (1.0 in) of brake pedal travel.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was A Diagnostic System Check-ABS performed? | -- | ||
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 | |
3 |
Did DTC C1293 clear? | -- | ||
4 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
