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Turn Signal Lamps

NOTE:

The turn signal switch is integral to the multi-function switch/Steering Column Control Module (SCCM), which communicates with the Body Control Module (BCM) over the CAN data bus. Before performing any of the following tests, determine whether the other functions of the multi-function switch/SCCM are operational. If the other multi-function switch/SCCM functions are ineffective, diagnose and repair that problem before attempting to repair the Turn Signal Lamps.

CONDITION POSSIBLE CAUSES CORRECTION
ONE TURN SIGNAL LAMP DOES NOT ILLUMINATE 1. Ineffective LED unit. 1. Test and replace front lamp unit or rear tail lamp unit as required.
2. Ineffective ground circuit. 2. Test and repair open LED circuit if required.
3. Ineffective feed circuit. 3. Test and repair open right or left turn signal feed circuit if required.
4. Ineffective BCM inputs or outputs. 4. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
ALL RIGHT SIDE OR ALL LEFT SIDE TURN SIGNAL LAMPS (OR BOTH SIDES) DO NOT FLASH 1. Ineffective feed circuit. 1. Test and repair open right or left turn signal feed circuit if required.
2. Ineffective SCCM inputs or outputs. 2. Use a diagnostic scan tool and the appropriate diagnostic information for further SCCM diagnosis.
3. Ineffective BCM inputs or outputs. 3. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
ALL RIGHT SIDE OR ALL LEFT SIDE TURN SIGNALS FLASH TOO RAPIDLY (MORE THAN 100 FLASHES PER MINUTE) 1. Ineffective LED unit. 1. Test and replace front lamp unit or rear tail lamp unit as required.
2. Ineffective ground circuit. 2. Test and repair open LED ground circuit if required.
3. Ineffective feed circuit. 3. Test and repair open right or left turn signal feed circuit if required.
TURN SIGNALS DO NOT AUTOMATICALLY CANCEL 1. Ineffective cancel cam. 1. Inspect and replace the turn signal cancel cam (SCCM) if required.
2. Ineffective cancel actuator. 2. Inspect and replace the turn signal cancel actuator (SCCM) if required.
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