Infiniti QX56 (JA60). Manual - part 495

DAYTIME LIGHT SYSTEM

EXL-9

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DAYTIME LIGHT SYSTEM

System Diagram

INFOID:0000000005369869

System Description

INFOID:0000000005146609

The headlamp system for Canada vehicles is equipped with a daytime light relay that activates the high beam

headlamps at approximately half illumination whenever the engine is operating. If the parking brake is applied

before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate once the

parking brake is released. Thereafter, the daytime lights will continue to operate when the parking brake is

applied.

Component Parts Location

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AWLIA1751GB

AWLIA1626ZZ

EXL-10

< FUNCTION DIAGNOSIS >

DAYTIME LIGHT SYSTEM

Component Description

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After starting the engine with the parking brake released and the combination switch (lighting and turn signal

switch) in the OFF or 1ST position, the headlamp high beam automatically turns on at a reduced intensity.

With the combination switch (lighting and turn signal switch) in the 2nd position or with autolamps ON, the

headlamps function the same as conventional light systems.

OPERATION

The BCM monitors inputs from the parking brake switch and the combination switch (lighting and turn signal

switch) to determine when to activate the daytime light system.  The BCM sends a daytime light request to the

IPDM E/R via the CAN communication lines.  The IPDM E/R grounds the daytime light relay which in turn, pro-

vides power to the ground side of the LH high beam lamp.  Power flows backward through the LH high beam

lamp to the IPDM E/R, through the high beam fuses, through the RH high beam lamp circuit to the RH high

beam lamp and on to ground.  The  high beam lamps are wired in series which causes them to illuminate at a

reduced intensity. 

1.

IPDM E/R E119, E122, E123, E124

2.

BCM M18, M20 (view with instrument 
panel removed)

3.

Daytime light relay E103

4.

Combination switch (lighting and turn 
signal switch) M28

5.

Combination meter M23, M24

6.

Parking brake switch M11

AUTO LIGHT SYSTEM

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AUTO LIGHT SYSTEM

System Diagram

INFOID:0000000005146612

System Description

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• BCM (Body Control Module) controls auto light operation according to signals from optical sensor, combina-

tion switch (lighting and turn signal switch) and ignition switch.

• IPDM E/R (Intelligent Power Distribution Module Engine Room) operates parking, license plate, tail and

headlamps according to CAN communication signals from BCM.

• Optical sensor detects ambient brightness and converts light (lux) to voltage, then sends the optical sensor

signal to BCM.

OUTLINE

The auto light control system has an optical sensor that detects outside brightness.

When the combination switch (lighting and turn signal switch) is in AUTO position, it automatically turns ON/

OFF the parking, license plate, tail and headlamps in accordance with the ambient light. Sensitivity can be

adjusted in four steps. For the details of the setting, Refer to 

BCS-22, "HEADLAMP : CONSULT-III Function

(BCM - HEAD LAMP)"

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AWLIA1752GB

EXL-12

< FUNCTION DIAGNOSIS >

AUTO LIGHT SYSTEM

Component Parts Location

INFOID:0000000005146614

Component Description

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AUTO LIGHT OPERATION

The auto light system operates the low beam and high beam headlamps, parking lamps, tail lamps and license

plate lamps. The BCM monitors the combination switch (lighting and turn signal switch) position as a part of

the BCM combination switch (lighting and turn signal switch) reading function. When the combination switch

(lighting and turn signal switch) is in the AUTO position, the BCM automatically turns the lamps ON/OFF

according to ambient light brightness.   

NOTE:

Timing for when lamps turn ON/OFF can be changed by the function setting of CONSULT-III. Refer to 

BCS-22,

"HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)"

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1.

BCM M18, M19,  M20 (view with instru-
ment panel removed)

2.

IPDM E/R E122, E123, E124

3.

Optical sensor M302

4.

Front door switch
LH B8
RH B108

5.

Rear door switch
LH B18
RH B116

6.

Back door latch (door ajar switch)
D503

7.

Combination switch (lighting and turn 
signal switch) M28

AWLIA1627ZZ