Circuit Description
This DTC is the second portion of DTC C1291. If DTC C1291 occurred during the last ignition cycle, DTC C1293 becomes a current malfunction during the next ignition cycle. This keeps the TCS disabled until a stoplamp switch ON state is detected. When a stoplamp switch ON state is detected during an ignition cycle in which DTC C1293 is a current malfunction, DTC C1293 will become a history DTC at the end of the current ignition cycle, and the TCS will enable at the start of the next ignition cycle. DTC C1293 alone indicates that DTC C1291 occurred previously, but is intermittent, or has been corrected.
Conditions for Setting the DTC
A DTC C1291 was set in a previous ignition cycle.
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | The TCS is disabled. |
| • | The TRACTION CONTROL indicator is turned ON. |
| • | The ABS remains functional. |
Conditions for Clearing the DTC
| • | The condition for DTC is no longer present and you used scan tool Clear DTCs function. |
| • | The condition for DTC is no longer present and you used the On-Board Clear DTCs function. |
| • | The EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
| • | Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis may cause replacement of the parts without repairing the malfunction. |
| • | The following conditions may cause most intermittent malfunctions: |
| - | Poor connections |
| - | Rubbed through wire insulation |
| - | A broken wire inside the insulation |
| • | Verify proper stoplamp/BTSI switch operation during the data list of the scan tool. As the brake is applied, the data list should display the stoplamp/BTSI switch on within an inch of travel. |
| • | If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
Is DTC C1291 set as a history or current code? | -- | Go to DTC C1291 Open Brake Lamp Switch Contacts During Deceleration |
