Nissan Leaf. Manual - part 638

COMPONENT PARTS

EXL-153

< SYSTEM DESCRIPTION >

[HALOGEN HEADLAMP]

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SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000010121418

No.

Part

Function

1.

IPDM E/R

• Controls the integrated relay, and supplies voltage to the load according to the re-

quest from BCM (via CAN communication).

• Refer to 

PCS-6, "Component Parts Location"

 for detailed installation location.

2.

Combination switch
(Lighting & turn signal switch)

Refer to 

BCS-8, "COMBINATION SWITCH READING SYSTEM : System Descrip-

tion"

.

3.

Combination meter

• Blinks the turn signal indicator lamp and outputs the turn signal operating sound 

with integrated buzzer according to the request from BCM (via CAN communica-
tion).

• Turns the tail lamp indicator lamp, high beam indicator lamp, front fog lamp indi-

cator lamp and rear fog lamp indicator lamp ON according to the request from 
BCM (via CAN communication).

4.

Hazard switch

Refer to 

EXL-154, "Hazard Switch"

.

5.

BCM

• Detects each switch condition by the combination switch reading function
• Judges that the exterior lamps are turned ON according to the vehicle condition
• Requests the headlamp relay (HI/LO), tail lamp relay and front fog lamp relay ON 

to IPDM E/R (via CAN communication)

• Requests the high beam indicator lamp, tail lamp indicator lamp and front fog 

lamp indicator lamp ON to the combination meter (via CAN communication)

• Judges the outside brightness from the optical sensor signal.
• Judges the ON/OFF timing according to the vehicle condition.
• Judges the ON/OFF status of the exterior lamp according to the outside bright-

ness and the vehicle condition.

• Refer to 

BCS-5, "BODY CONTROL SYSTEM : Component Parts Location"

 for 

detailed installation location.

6.

Optical sensor 

Refer to 

EXL-154, "Optical Sensor"

.

7.

Front side marker lamp

Refer to 

EXL-282, "Bulb Specifications"

.

8.

Front turn signal lamp

Refer to 

EXL-282, "Bulb Specifications"

.

9.

Headlamp LO

Refer to 

EXL-282, "Bulb Specifications"

10.

Headlamp HI

Refer to 

EXL-282, "Bulb Specifications"

.

11.

Parking Lamp

Refer to 

EXL-282, "Bulb Specifications"

.

12.

Front fog lamp (if equipped)

Refer to 

EXL-282, "Bulb Specifications"

.

ALLIA1269ZZ

EXL-154

< SYSTEM DESCRIPTION >

[HALOGEN HEADLAMP]

COMPONENT PARTS

*: With daytime running light system

Optical Sensor

INFOID:0000000010121419

Optical sensor converts the outside brightness (lux) to voltage and

transmits the optical sensor signal to BCM.

Hazard Switch

INFOID:0000000010121420

Inputs the hazard switch ON/OFF signal to BCM.

13.

Daytime running light relay*

Headlamp HI ground circuit is switched according to request from IPDM E/R.

14.

Front door switch (LH)

Refer to 

DLK-20, "Door Switch"

.

15.

Rear side marker lamp

Refer to 

EXL-282, "Bulb Specifications"

.

16.

Tail lamp

Refer to 

EXL-282, "Bulb Specifications"

.

17.

Rear turn signal lamp

Refer to 

EXL-282, "Bulb Specifications"

.

18.

License plate lamp

Refer to 

EXL-282, "Bulb Specifications"

.

No.

Part

Function

JMLIA2581GB

JMLIA2580GB

SYSTEM

EXL-155

< SYSTEM DESCRIPTION >

[HALOGEN HEADLAMP]

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SYSTEM

HEADLAMP SYSTEM
HEADLAMP SYSTEM : System Description

INFOID:0000000010121421

SYSTEM DIAGRAM

OUTLINE

Headlamp is controlled by combination switch reading function and headlamp control function of BCM, and

relay control function of IPDM E/R.

HEADLAMP (LO) OPERATION 

• BCM detects the combination switch condition with the combination switch reading function.

• BCM transmits the low beam request signal to IPDM E/R with CAN communication according to the head-

lamp (LO) ON condition.

Headlamp (LO) ON condition:

- Lighting switch 2ND

- Lighting switch AUTO (auto light function ON judgment)

- Lighting switch AUTO, with the front fog lamp switch ON and the power switch ON 

- Lighting switch PASS

HEADLAMP (HI) OPERATION

• BCM transmits the high beam request signal to IPDM E/R and the combination meter with CAN communica-

tion according to the headlamp (HI) ON condition. 

Headlamp (HI) ON condition:

- Lighting switch HI with the lighting switch 2ND or AUTO (auto light function ON judgment)

- Lighting switch PASS

- Lighting switch AUTO, with the front fog lamp switch ON, the power switch ON and lighting switch HI

• Combination meter turns the high beam indicator lamp ON according to the high beam request signal. 

• IPDM E/R turns the integrated headlamp high relay ON, and turns the headlamp ON according to the high

beam request signal.

HEADLAMP SYSTEM : Fail-Safe

INFOID:0000000010121422

CAN COMMUNICATION CONTROL

When CAN communication with BCM is impossible, IPDM E/R performs fail-safe control. After CAN communi-

cation recovers normally, it also returns to normal control.

If No CAN Communication Is Available With BCM

ALLIA1444GB

EXL-156

< SYSTEM DESCRIPTION >

[HALOGEN HEADLAMP]

SYSTEM

AUTO LIGHT SYSTEM (EXCEPT FOR CANADA)
AUTO LIGHT SYSTEM (EXCEPT FOR CANADA) : System Description

INFOID:0000000010121423

SYSTEM DIAGRAM

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

- Wiper linked auto lighting function

- Auto light adjustment system

Control by IPDM E/R:

- Relay control function

• Auto light system has the auto light function (with twilight lighting function), wiper linked auto lighting function

and delay timer function.

- Auto light function automatically turns ON/OFF the exterior lamps* and each illumination automatically,

depending on the outside brightness.

- Wiper linked auto lighting function automatically turns ON/OFF the exterior lamps* and each illumination

when the light switch is in the AUTO position, according to a front wiper operation.

- When auto light system turns the exterior lamps ON with the power 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, front fog lamp and side marker lamp (Headlamp HI and front fog

lamp depend on the combination switch condition.)

NOTE:

The settings of the twilight lighting function and the wiper linked auto lighting function can be changed with

CONSULT. Refer to 

BCS-17, "HEADLAMP : CONSULT Function (BCM - HEAD LAMP)"

.

AUTO LIGHT FUNCTION (WITH TWILIGHT LIGHTING FUNCTION)

Description

• BCM detects the combination switch condition with the combination switch reading function.

• BCM supplies voltage to the optical sensor when the power switch is turned ON or ACC.

Control part

Fail-safe operation

Headlamp

• Turns ON the headlamp low relay when the power switch is turned ON
• Turns OFF the headlamp low relay when the power switch is turned OFF
• Headlamp high relay OFF

JMLIA1254GB