Step Lamp Circuit

STEP LAMP CIRCUIT

Description

Controls the step lamp control circuit (ground side) to turn the step lamps and foot lamps ON and OFF.


Component Function Check


CAUTION:
Before performing the diagnosis, check that the following is normal.
- Battery saver output/power supply
- Front step lamp bulb
- Foot lamp bulb

1. CHECK STEP LAMP OPERATION

CONSULT
1.Turn ignition switch ON.
2.Select STEP LAMP TEST of BCM (INT LAMP) active test item.
3.While operating the test items, check that front step lamp and foot lamp turns ON/OFF.
On: Step lamp and foot lamp ON


Off: Step lamp and foot lamp OFF
Is the inspection result normal?
YES- Step lamp circuit is normal.
NO- Refer to "Diagnosis Procedure" .


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Interior Room Lamp Control System.

1. CHECK STEP LAMP OUTPUT

CONSULT
1.Turn ignition switch ON.
2.Select STEP LAMP TEST of BCM (INT LAMP) active test item.
3.While operating the test item, check voltage between BCM harness connector M18 terminal 21 and ground.





Is the inspection result normal?
YES- Step lamp control circuit is operating normally.
Fixed ON-GO TO 3
Fixed OFF-GO TO 2

2. CHECK STEP LAMP OPEN CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect the following harness connectors:
- BCM M18
-Front step lamp LH D11
-Front step lamp RH D109
-Foot lamp LH M99
-Foot lamp RH M100
3.Check continuity between BCM harness connector M18 terminal 21 and the following lamp harness connector terminal.
Revision: March 20122013 Infiniti JX





Is the inspection result normal?
YES- Check front step lamp or foot lamp for an open. If NG, replace lamp in question. Refer to "DRIVER SIDE : Removal and Installation" Removal and Installation or "PASSENGER SIDE : Bulb Replacement" Bulb Replacement
or "Removal and Installation" Removal and Installation. If OK, replace BCM. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace harness or connectors.

3. CHECK STEP LAMP SHORT CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect the following harness connectors:
- BCM M18
-Front step lamp LH D11
-Front step lamp RH D109
-Foot lamp LH M99
-Foot lamp RH M100
3.Check continuity between BCM harness connector M18 terminal 21 and the following lamp harness connector terminal.





Is the inspection result normal?
YES- Replace BCM. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace harness or connectors.
Revision: March 20122013 Infiniti JX