Illumination Control Signal Circuit

ILLUMINATION CONTROL SIGNAL CIRCUIT





Component Function Check
1.CHECK ILLUMINATION CONTROL SIGNAL INPUT BY CONSULT-III
CONSULT-III DATA MONITOR
1. Turn ignition switch ON.
2. Switch the lighting switch 1ST.
3. Select "ILLUM CONT SIGNAL" of TOTAL ILLUM C/U data monitor item.
4. While operating the illumination control switch, check the monitor status.





Is the item status normal?
YES - Illumination control signal circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK ILLUMINATION CONTROL SIGNAL INPUT
1. Switch the lighting switch 1ST.
2. While operating the illumination control switch, check the voltage between the total illumination control unit harness connector and the ground.





Is the measurement value normal?
YES - Replace the total illumination control unit.
NO - GO TO 2.
2.CHECK ILLUMINATION CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the total illumination control unit connector and the combination meter connector.
3. Check continuity between the total illumination control unit harness connector and the combination meter harness connector.





Does continuity exist?
YES - GO TO 3.
NO - Repair the harnesses or connectors.
3.CHECK ILLUMINATION CONTROL SIGNAL SHORT CIRCUIT
1. Disconnect the selector lever position indicator connector.
2. Check continuity between the total illumination control unit harness connector and the ground.





Does continuity exist?
YES - Repair the harnesses or connectors.
NO - Replace the total illumination control unit.