Ignition Keyhole Illumination Control Circuit

IGNITION KEYHOLE ILLUMINATION CONTROL CIRCUIT

Description

Controls the ignition keyhole illumination (ground side) by PWM signal.
NOTE:
PWM signal control period is approximately 250 Hz (in the gradual brightening/dimming).


Component Function Check


CAUTION:
Before performing the diagnosis, check that the following is normal.
- Interior room lamp power supply
- Ignition keyhole illumination bulb

1. CHECK IGNITION KEYHOLE ILLUMINATION OPERATION

CONSULT ACTIVE TEST
1.Turn ignition switch ON.
2.Select "IGN ILLUM" of BCM (INT LAMP) active test item.
3.With operating the test items, check that ignition keyhole illumination turns ON/OFF.
On: Ignition keyhole illumination ON
Off: Ignition keyhole illumination OFF
Does the ignition keyhole illumination turn ON/OFF?
YES- Ignition keyhole illumination circuit is normal.
NO- .


Diagnosis Procedure


1. CHECK IGNITION KEYHOLE ILLUMINATION OUTPUT

CONSULT ACTIVE TEST
1.Turn ignition switch OFF.
2.Remove ignition keyhole illumination bulb.
3.Turn ignition switch ON.
4.Select "IGN ILLUM" of BCM (INT LAMP) active test item.
5.With operating the test item, check continuity between BCM harness connector and ground.





Is the measurement value normal?
YES- GO TO 2.
Fixed ON-GO TO 3.
Fixed OFF-Replace BCM.

2. CHECK IGNITION KEYHOLE ILLUMINATION OPEN CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect BCM connector and ignition keyhole illumination connector.
3.Check continuity between BCM harness connector and ignition keyhole illumination harness connector.





Does continuity exist?
YES- Replace ignition keyhole illumination.
NO- Repair harnesses or connectors.

3. CHECK IGNITION KEYHOLE ILLUMINATION SHORT CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect BCM connector and ignition keyhole illumination connector.
3.Check continuity between BCM harness connector and ground.





Does continuity exist?
YES- Repair harnesses or connectors.
NO- Replace BCM.