C1311

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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)
^ The TCS Indicator
Separate lamp driver modules turn the ABS and 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. Shorts to voltage on the ABS or TCS warning indicators are detected anytime after the bulb check is completed for more than 2 seconds. The engine must be running for the code to set. The ABS/TCS active indicator (Low Traction) will set DTC C131 1 if shorted to voltage during the 3 second bulb check. Shorts to ground or an open circuit are detected anytime after the bulb check is complete for more than 2 seconds.

Action Taken When The DTC Sets
^ A malfunction 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
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual or Scan Tool Diagnostics for the procedure.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
^ Rubbed-through wire insulation
^ A broken wire inside the insulation
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness

Important: Zero the J39200 test leads before making any resistance measurements.