C1311

CIRCUIT DESCRIPTION
DTC C1311 inspects the state of the following components in order to identify a situation in which the driver could not be alerted to a system malfunction or the availability of the ABS or TCS:
- The ABS warning indicator
- The ABS/TCS active indicator (LOW TRACTION)
Separate lamp driver modules turn the ABS and Traction Control System (TCS) warning indicators on, unless the EBCM/EBTCM provides a ground to turn them off. Because of the circuitry in the lamp driver modules, the EBCM/EBTCM only detects external wiring malfunctions. The EBCM/EBTCM provides a ground to turn on the ABS/TCS active indicator circuit.

CONDITIONS FOR SETTING THE DTC
DTC C1311 can set anytime.
The ABS or TCS warning indicators will set DTC C1311 if the ABS and TCS warning indicators are open or shorted to ground during the three second bulb check. Shorts to voltage on the ABS or TCS warning indicators are detected anytime after the bulb check is completed for more than two seconds.

The ABS/TCS active indicator (LOW TRACTION) will set DTC C1311 if shorted to voltage during the three second bulb check. Shorts to ground or an open circuit are detected anytime after the bulb check is complete for more than two seconds.

ACTION TAKEN WHEN THE DTC SETS
- A malfunction Diagnostic Trouble Code (DTC) stores.
- The ABS does not disable.
- The TCS does not disable.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists and the scan tool Clear DTC function is used.
- 100 drive cycles pass with no DTC detected.

DIAGNOSTIC AIDS

The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual for the procedure.

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