Infiniti QX56 (JA60). Manual - part 501

HEADLAMP (LO) CIRCUIT

EXL-33

< COMPONENT DIAGNOSIS >

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HEADLAMP (LO) CIRCUIT

Description

INFOID:0000000005146643

The IPDM E/R (intelligent power distribution module engine room) controls the headlamp low relay based on

inputs from the BCM via the CAN communication lines. When the headlamp low relay is energized, power

flows through fuses 40 and 41, located in the IPDM E/R. Power then flows to the front combination lamps to

the headlamp low beam.

Component Function Check

INFOID:0000000005146644

1.

CHECK HEADLAMP (LO) OPERATION

WITHOUT CONSULT-III

1. Start IPDM E/R auto active test. Refer to 

PCS-12, "Diagnosis Description"

.

2. Check that the headlamp is turned ON.

NOTE:

HI/LO is repeated 1 second each when using the IPDM E/R auto active test.

CONSULT-III

1. Select "EXTERNAL LAMPS" of IPDM E/R active test item.

2. With the test items operating, check that the headlamp is turned ON.

Is the headlamp turned ON?

YES

>> Headlamp (LO) is normal.

NO

>> Refer to 

EXL-33, "Diagnosis Procedure - Without Daytime Light System"

, 

EXL-34, "Diagnosis

Procedure - With Daytime Light System"

.

Diagnosis Procedure - Without Daytime Light System

INFOID:0000000005146645

Regarding Wiring Diagram information, refer to 

EXL-52, "Wiring Diagram"

.

1.

CHECK HEADLAMP (LO) FUSES

1. Turn the ignition switch OFF.

2. Check that the following fuses are not open.

Is the fuse open?

YES

>> Repair the harness and replace the fuse.

NO

>> GO TO 2.

2.

CHECK HEADLAMP (LO) OUTPUT VOLTAGE

Lo

: Headlamp ON

Off

: Headlamp OFF

Unit

Location

Fuse No.

Capacity

Headlamp LO (LH) 

IPDM E/R

40

15A

Headlamp LO (RH) 

IPDM E/R

41

15A

EXL-34

< COMPONENT DIAGNOSIS >

HEADLAMP (LO) CIRCUIT

1. Turn the ignition switch OFF.

2. Disconnect the front combination lamp connector.

3. Turn the ignition switch ON.

4. Turn the low beam headlamps ON.

5. With the low beam headlamps ON, check the voltage between

the combination lamp connector and ground.

Is voltage reading as specified?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK HEADLAMP (LO) CIRCUIT FOR OPEN

1. Turn the ignition switch OFF.

2. Disconnect IPDM E/R connector.

3. Check continuity between the IPDM E/R harness connector and

the front combination lamp harness connector.

Does continuity exist?

YES

>> GO TO 4.

NO

>> Repair the harnesses or connectors.

4.

CHECK FRONT COMBINATION LAMP (LO) GROUND CIRCUIT

Check continuity between the front combination lamp harness con-

nector terminal and ground.

Does continuity exist?

YES

>> Inspect the headlamp bulb.

NO

>> Repair the harness.

Diagnosis Procedure - With Daytime Light System

INFOID:0000000005146646

Regarding Wiring Diagram information, refer to 

EXL-56, "Wiring Diagram"

.

1.

CHECK HEADLAMP (LO) FUSES

1. Turn the ignition switch OFF.

2. Check that the following fuses are not open.

(+)

(

−)

Voltage

Connector

Terminal

LH

E11

5

Ground

Battery voltage

RH

E107

5

ALLIA0855ZZ

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B

Continuity

Connector

Terminal

Connector

Terminal

LH

E123

52

E11

5

Yes

RH

54

E107

5

AWLIA1372ZZ

Connector

Terminal

—

Continuity

LH

E11

1

Ground

Yes

RH

E107

1

ALLIA0856ZZ

HEADLAMP (LO) CIRCUIT

EXL-35

< COMPONENT DIAGNOSIS >

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Is the fuse open?

YES

>> Repair the harness and replace the fuse.

NO

>> GO TO 2.

2.

CHECK HEADLAMP (LO) OUTPUT VOLTAGE

1. Turn the ignition switch OFF.

2. Disconnect the front combination lamp connector.

3. Turn the ignition switch ON.

4. Turn the low beam headlamps ON.

5. With the low beam headlamps ON, check the voltage between

the combination lamp connector and ground.

Is voltage reading as specified?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK HEADLAMP (LO) CIRCUIT FOR OPEN

1. Turn the ignition switch OFF.

2. Disconnect IPDM E/R connector.

3. Check continuity between the IPDM E/R harness connector and

the front combination lamp harness connector.

Does continuity exist?

YES

>> GO TO 4.

NO

>> Repair the harnesses or connectors.

4.

CHECK FRONT COMBINATION LAMP (LO) GROUND CIRCUIT

Check continuity between the front combination lamp harness con-

nector terminal and ground.

Does continuity exist?

YES

>> Inspect the headlamp bulb.

NO - RH>>Repair the harness.

NO - LH>>Inspect the daytime light relay. If OK, repair harness. If

NG, replace the daytime light relay. 

Unit

Location

Fuse No.

Capacity

Headlamp LO (LH) 

IPDM E/R

40

15A

Headlamp LO (RH) 

IPDM E/R

41

15A

(+)

(

−)

Voltage

Connector

Terminal

LH

E6

5

Ground

Battery voltage

RH

E108

5

ALLIA0855ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

LH

E123

52

E6

5

Yes

RH

54

E108

5

AWLIA1372ZZ

Connector

Terminal

—

Continuity

LH

E6

1

Ground

Yes

RH

E108

1

ALLIA0856ZZ

EXL-36

< COMPONENT DIAGNOSIS >

FRONT FOG LAMP CIRCUIT

FRONT FOG LAMP CIRCUIT

Description

INFOID:0000000005146647

The IPDM E/R (intelligent power distribution module engine room) controls the front fog lamp relay based on

inputs from the BCM via the CAN communication lines. When the front fog lamp relay is energized, power

flows from the front fog lamp relay in the IPDM E/R to the front fog lamps. 

Component Function Check

INFOID:0000000005146648

1.

CHECK FRONT FOG LAMP OPERATION

WITHOUT CONSULT-III

1. Activate IPDM E/R auto active test. Refer to 

PCS-12, "Diagnosis Description"

.

2. Check that the front fog lamp is turned ON.

CONSULT-III

1. Select "EXTERNAL LAMPS" of IPDM E/R active test item.

2. With operating the test items, Check that the front fog lamp is turned ON.

Is the front fog lamp turned ON?

YES

>> Front fog lamp circuit is normal.

NO

>> Refer to 

EXL-36, "Diagnosis Procedure"

. 

Diagnosis Procedure

INFOID:0000000005146649

Regarding Wiring Diagram information, refer to 

EXL-73, "Wiring Diagram"

.

1.

CHECK FRONT FOG LAMP FUSE

1. Turn the ignition switch OFF.

2. Check that the following fuses are not open.

Is the fuse open?

YES

>> Repair the harness and replace the fuse.

NO

>> GO TO 2.

2.

CHECK FRONT FOG LAMP OUTPUT VOLTAGE

1. Turn the ignition switch OFF.

2. Disconnect the front fog/turn lamp connector.

3. Turn the ignition switch ON.

4. Turn the front fog lamps ON.

5. Check the voltage between the fog/turn lamp connector and

ground.

Are the voltage readings as specified?

YES

>> GO TO 4.

NO

>> GO TO 3.

Fog

: Front fog lamp ON

Off

: Front fog lamp OFF

Unit

Location

Fuse No.

Capacity

Front fog lamp 

IPDM E/R

56

20A

(+)

(

−)

Voltage

Connector

Terminal

LH

E101

1

Ground

Battery voltage

RH

E102

1

ALLIA0719GB