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, keeping the TCS disabled until a stoplamp/BTSI switch On state is seen. When a change is seen during an ignition cycle in which DTC C1293 is a current malfunction, DTC C1291 will clear itself 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 the previous ignition cycle.
Action Taken When the DTC Sets
| • | A DTC C1293 is stored |
| • | The TCS is disabled |
| • | The TRACTION OFF indicator is turned on |
| • | The ABS remains functional |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the scan tool clear DTC function is used |
| • | 50 ignition cycles have passed with no DTCs detected |
Diagnostic Aids
| • | Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors can result in misdiagnosis. Misdiagnosis may cause replacement of 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 one 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 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
Is DTC C1291 set as a history or current code? | -- | Go to DTC C1291 Open Brake Lamp Switch Contacts During Deceleration | Go to Diagnostic System Check |
