Map Lamp Circuit

MAP LAMP CIRCUIT

Description






Controls the lamp (ground side) by PWM signal (duty) when the map lamp main switch is DOOR.


Component Function Check


CAUTION:
Check the following item first.
- Hospitality lighting power supply 1 circuit (When both side lamps are not turned ON.)
- Map lamp bulbs

1. CHECK MAP LAMP CONTROL FUNCTION

CONSULT ACTIVE TEST
1.Turn ignition switch ON.
2.Select "MAP LAMP-DR" or "MAP LAMP-AS" of TOTAL ILLUM C/U active test item.
3.While operating the test items, check map lamps operation.





Are the map lamps turned ON/OFF?
YES- Map lamp circuit is normal.
NO- .


Diagnosis Procedure


1. CHECK MAP LAMP CONTROL OUTPUT

CONSULT ACTIVE TEST
1.Turn ignition switch ON.
2.Switch map lamp main switch DOOR.
3.Select "MAP LAMP-DR" or "MAP LAMP-AS" of TOTAL ILLUM C/U active test item.
4.While operating the test items, check voltage between total illumination control unit harness connector and ground.
Driver side





Passenger side





Is the measurement value normal?
Fixed at 12 V-Replace the total illumination control unit.
Fixed at 0 V-GO TO 2.

2. CHECK THE SYMPTOM

Check that the lamp fixed to ON or OFF.
Fixed OFF-GO TO 3.
Fixed ON-GO TO 4.

3. CHECK MAP LAMP CONTROL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect the total illumination control unit and map lamp connector.
3.Check continuity between the total illumination control unit harness connector and map lamp harness connector.





Does continuity exist?
YES- Replace the map lamp assembly.
NO- Repair the harnesses or connectors.

4. CHECK MAP LAMP CONTROL CIRCUIT FOR SHORT

1.Turn ignition switch OFF.
2.Disconnect the total illumination control unit and map lamp connector.
3.Check continuity between the total illumination control unit harness connector and ground.





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