| ONE TURN SIGNAL LAMP DOES NOT ILLUMINATE |
1. Ineffective or missing bulb. |
1. Test and replace turn signal bulb if required. |
| 2. Ineffective ground circuit. |
2. Test and repair open ground 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 left (lighting) multi-function switch. |
2. Test and replace left (lighting) multi-function switch (clockspring) if required. |
| 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 or missing bulb. |
1. Test and replace turn signal bulb if required. |
| 2. Ineffective ground circuit. |
2. Test and repair open bulb 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 (clockspring) if required. |
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2. Ineffective cancel actuator. |
2. Inspect and replace the turn signal cancel actuator (clockspring) if required. |