Infiniti G37 Coupe. Manual - part 648

EXL-12

< FUNCTION DIAGNOSIS >

[XENON TYPE]

AUTO LIGHT SYSTEM

AUTO LIGHT SYSTEM

System Diagram

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System Description

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OUTLINE

•  Auto light system is controlled by each function of BCM and IPDM E/R.

Control by BCM

- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function

Control by IPDM E/R

- Relay control function
• Auto light system has the auto light function and the delay timer function.
- Auto light function turns the exterior lamps* and each illumination ON/OFF automatically according to the

outside brightness.

- When auto light system turns the exterior lamps ON with the ignition switch OFF, delay timer function turns

the exterior lamps OFF depending on the vehicle condition with the auto light function after a certain period
of time.

*: Headlamp (LO/HI), parking lamp, tail lamp, and front fog lamp (Headlamp HI and front fog lamp depend on
the combination switch condition.)

AUTO LIGHT FUNCTION

• BCM detects the combination switch condition with the combination switch reading function.
• BCM supplies voltage to optical sensor when the ignition switch is turned ON or ACC.
• Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
• BCM judges outside brightness from the optical sensor signal and judges ON/OFF condition of the exterior

lamp and each illumination according to the outside brightness. 

• BCM transmits each request signal to IPDM E/R with CAN communication according to ON/OFF condition

by the auto light function.

NOTE:
ON/OFF timing differs based on the sensitivity from the setting. The setting can be set by CONSULT-III. Refer
to 

EXL-31, "HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)"

.

DELAY TIMER FUNCTION

BCM turns the exterior lamp OFF depending on the vehicle condition with the auto light function when the igni-
tion switch is turned OFF.
• Turns the exterior lamp OFF 5 minutes after detecting that any door opens (Door switch ON).
• Turns the exterior lamp OFF a certain period of time* after closing all doors (Door switch ON

→

OFF).

JSLIA0132GB

AUTO LIGHT SYSTEM

EXL-13

< FUNCTION DIAGNOSIS >

[XENON TYPE]

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• Turns the exterior lamp OFF with the ignition switch ACC or the light switch OFF.
*: The preset time is 45 seconds. The timer operating time can be set by CONSULT-III. Refer to 

EXL-31,

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

.

NOTE:
When any position other than the light switch AUTO is set, the auto light system function switches to the exte-
rior lamp battery saver function.

Component Parts Location

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1.

Combination switch

2.

Optical sensor

3.

BCM

4.

IPDM E/R

5.

Unified meter and A/C amp.

A.

Instrument upper panel (RH)

B.

Dash side lower (Passenger side)

C.

Engine room dash panel (RH)

D.

Behind cluster lid C

JPLIA0583ZZ

EXL-14

< FUNCTION DIAGNOSIS >

[XENON TYPE]

AUTO LIGHT SYSTEM

Component Description

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Part

Description

BCM

• Judges each switch condition by the combination switch reading function.
• Judges the outside brightness from the optical sensor signal.
• Judges the OFF timing according to the vehicle condition.
• Judges the ON/OFF status of the exterior lamp and each illumination according to the 

outside brightness and the vehicle condition.
Requests ON/OFF of each relay to IPDM E/R (with CAN communication).

IPDM E/R

Controls the integrated relay, and supplies voltage to the load according to the request 
from BCM (with CAN communication).

Combination switch
(Lighting & turn signal switch)

Refer to 

BCS-5, "System Diagram"

.

Optical sensor

Refer to 

EXL-79, "Description"

.

DAYTIME RUNNING LIGHT SYSTEM

EXL-15

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DAYTIME RUNNING LIGHT SYSTEM

System Diagram

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System Description

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OUTLINE

• Turns the front fog lamp ON as the daytime running light.
• Daytime running light is controlled by daytime running light control function and combination switch reading

function of BCM, and relay control function of IPDM E/R.

DAYTIME RUNNING LIGHT OPERATION 

• BCM detects the combination switch condition by the combination switch reading function.
• BCM detects the vehicle condition depending on the following signals.
- Engine condition signal (received from ECM with CAN communication)
- Parking brake switch signal (received from unified meter and A/C amp. with CAN communication)
• BCM transmits the front fog lamp request signal to IPDM E/R with CAN communication according to the day-

time running light ON condition.

Daytime running light ON condition

- While the engine running with the parking brake released

Daytime running light OFF condition

- Engine stopped
- Headlamp ON (Passing included)
• IPDM E/R turns the integrated front fog lamp relay ON and turns the front fog lamp ON according to the front

fog lamp request signal.

JPLIA0006GB