Infiniti QX56 (JA60). Manual - part 494

DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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DETAILED FLOW

1.

INTERVIEW FOR MALFUNCTION

Find out what the customer's concerns are.

>> GO TO 2.

2.

SYMPTOM CHECK

Verify the symptom from the customer's information.

>> GO TO 3.

3.

BASIC INSPECTION

Check the operation of each part. Check that any concerns occur other than those mentioned in the customer

interview.

>> GO TO 4.

4.

SELF-DIAGNOSIS WITH CONSULT-III

Perform the self diagnosis with CONSULT-III. Check that any DTC is detected.
Is any DTC detected?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

TROUBLE DIAGNOSIS BY DTC

Perform the trouble diagnosis for the detected DTC. Specify the malfunctioning part.

>> GO TO 9.

6.

FAIL-SAFE ACTIVATION CHECK

Determine if the customer's concern is related to fail-safe activation.
Does the fail-safe activate?

YES

>> GO TO 7.

NO

>> GO TO 8.

7.

SYSTEM DIAGNOSIS

Perform the system diagnosis for the system in which the fail-safe activates. Specify the malfunctioning part.

>> GO TO 9.

8.

SYMPTOM DIAGNOSIS

Perform the symptom diagnosis. Specify the malfunctioning part.

>> GO TO 9.

9.

MALFUNCTION PART REPAIR

Repair or replace the malfunctioning part.

>> GO TO 10.

10.

REPAIR CHECK (SELF-DIAGNOSIS WITH CONSULT-III)

Perform the self diagnosis with CONSULT-III. Verfied that no DTCs are detected. Erase all DTCs detected

prior to the repair. Verify that DTC is not detected again.
Is any DTC detected?

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DIAGNOSIS AND REPAIR WORKFLOW

YES

>> GO TO 5.

NO

>> GO TO 11.

11.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.
Does it operate normally?

YES

>> Inspection End. 

NO

>> GO TO 3.

HEADLAMP

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FUNCTION DIAGNOSIS

HEADLAMP

System Diagram

INFOID:0000000005146604

System Description

INFOID:0000000005369868

Control of the headlamp system operation is dependent upon the position of the combination switch (lighting

and turn signal switch). When the combination switch (lighting and turn signal switch) is placed in the 2nd posi-

tion, the BCM (body control module) receives input requesting the headlamps and park lamps to illuminate.

This input is communicated to the IPDM E/R (intelligent power distribution module engine room) via the CAN

communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp LH high,

headlamp RH high and headlamp low relay coils. When energized, these relays direct power to the respective

headlamps, which then illuminate.

Component Parts Location

INFOID:0000000005146606

Component Description

INFOID:0000000005146607

XENON HEADLAMP

AWLIA1755GB

1.

BCM M18, M20 (view with instrument 
panel removed)

2.

IPDM E/R E122, E123, E124

3.

Combination switch (lighting and turn 
signal switch) M28

4.

Combination meter M23, M24

AWLIA1625ZZ

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< FUNCTION DIAGNOSIS >

HEADLAMP

A Xenon type headlamp is adapted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,

they produce light when a high voltage current is passed between two tungsten electrodes through a mixture

of Xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control

of the power supply gives the headlamps stable quality and tone color. Following are some of the advantages

of the Xenon type headlamp.

• The light produced by the headlamps is a white color comparable to sunlight that is easy on the eyes.

• Light output is nearly double that of halogen headlamps, affording increased area of illumination.

• The light features a high relative spectral distribution at wavelengths to which the human eye is most sensi-

tive. This means that even in the rain, more light is reflected back from the road surface toward the vehicle,

for added visibility.

• Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load. 

HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION

With the combination switch (lighting and turn signal switch) in the 2ND position and placed in HIGH position,

the BCM receives input requesting the headlamp high beams to illuminate. The flash to pass feature can be

used any time and also sends a signal to the BCM. This input is communicated to the IPDM E/R via the CAN

communication lines. The CPU of the combination meter controls the ON/OFF status off the HIGH BEAM indi-

cator. The CPU of the IPDM E/R controls the headlamp high relay coil which supplies power to the high beam

headlamps.

The combination meter receives a high beam request signal (ON) via the CAN communication lines and turns

the high beam indicator lamp ON.

EXTERIOR LAMP BATTERY SAVER CONTROL

With the combination switch (lighting and turn signal switch) in the 2nd position and the ignition switch is

turned from ON or ACC to OFF, the battery saver feature is activated.

Under this condition, the headlamps remain illuminated for 5 minutes unless the lighting switch position is

changed.  If the lighting switch position is changed, then the headlamps are turned off. 

This setting can be changed by CONSULT-III. Refer to 

BCS-22, "HEADLAMP : CONSULT-III Function (BCM -

HEAD LAMP)"

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