Diagnosis Procedure
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
Regarding Wiring Diagram information, refer to WIRING DIAGRAM .
- CHECK STEP LAMP OUTPUT
CONSULT
- Turn ignition switch ON.
- Select STEP LAMP TEST of BCM (INT LAMP) active test item.
- While operating the test item, check voltage between BCM harness connector M18 terminal 21 and ground.
BCM Ground STEP LAMP TEST Voltage
(Approx.)Connector Terminal M18 21 On 0V Off Battery voltage Is the inspection result normal?
YES
Step lamp control circuit is operating normally.
Fixed ON
GO TO STEP 3
Fixed OFF
GO TO 2
- CHECK STEP LAMP OPEN CIRCUIT
- Turn ignition switch OFF.
- 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
- Check continuity between BCM harness connector M18 terminal 21 and the following lamp harness connector terminal.
BCM Step lamp Continuity Connector Terminal Connector Terminal M18 21 Front step lamp LH D11 2 Yes Front step lamp RH D109 Foot lamp LH M99 Foot lamp RH M100 Is the inspection result normal?
YES
Check front step lamp or foot lamp for an open. If NG, replace lamp in question. Refer to REMOVAL AND INSTALLATION or BULB REPLACEMENT or REMOVAL AND INSTALLATION . If OK, replace BCM. Refer to REMOVAL AND INSTALLATION .
NO
Repair or replace harness or connectors.
- CHECK STEP LAMP SHORT CIRCUIT
- Turn ignition switch OFF.
- 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
- Check continuity between BCM harness connector M18 terminal 21 and ground.
BCM Ground Continuity Connector Terminal M18 21 No Is the inspection result normal?
YES
Replace BCM. Refer to REMOVAL AND INSTALLATION .
NO
Repair or replace harness or connectors.