Turn Signal Flasher: Testing and Inspection

INSPECTION

Turn Signal Light System (Turn signals do not function)
1. Check the turn fuse.






2. If OK, connect a voltmeter to the (G/Y) or (G/R) wire of the central processing unit, and check that battery voltage is applied when the turn signal switch is ON while the ignition switch is ON. If not correct, there may be a malfunction of the turn signal switch.
3. If there is voltage, connect a voltmeter to the (G/B) or (G/W) wire of the turn and hazard unit and check that battery voltage is applied when the turn signal switch is ON while the ignition switch is ON. If not correct, check the printed board of the turn and hazard unit in the central processing unit.
4. If there is voltage, there may be a poor ground of the central processing unit.






(Turn signals work only for one direction)
Check the turn signal switch, or turn signal light ground.
Hazard Warning Light System
(Turn signals function but the hazard warning lights do not)

1. Check the hazard fuse.
2. If OK, connect a voltmeter to the (B/L wire of the turn and hazard unit in the central processing unit and check that battery voltage is applied.
3. If there is no voltage, check the wiring between the hazard fuse and the central processing unit.
4. If there is voltage, connect a voltmeter to the (L/G) wire of the turn and hazard unit and check for no voltage when the hazard warning light switch is ON.
5. If there is voltage, there may be a malfunction of the hazard warning light switch or a poor ground of the switch.
6. If there is no voltage, connect a voltmeter to (G/B) or (G/W) wire of the turn and hazard unit and check that battery voltage is applied when the hazard warning light switch is ON.
7. If there is no voltage, there may be a malfunction of the turn and hazard unit.
8. If there is voltage, check the wiring or ground.