Nissan Sentra. Manual - part 451

COMPONENT PARTS

EXL-7

< SYSTEM DESCRIPTION >

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Component Description

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1.

IPDM E/R, (Headlamp high relay, 
Headlamp low relay, Taillamp relay 
and Front fog lamp relay (if equipped)) 

2.

Stop lamp switch

3.

Parking brake switch

4.

Combination meter

5.

Combination switch
(lighting and turn signal switch) 

6.

BCM (view with combination meter re-
moved)

7.

Optical sensor

8.

Front door switch LH (Other doors 
similar)

9.

Hazard switch

10. Daytime light relay (if equipped)

Part

Description

BCM

Controls the exterior lighting system.

Combination switch
(Lighting & turn signal switch)

Refer to 

BCS-9, "COMBINATION SWITCH READING SYSTEM : System Description"

 (with Intelligent 

Key system) or 

BCS-80, "COMBINATION SWITCH READING SYSTEM : System Description"

 (with-

out Intelligent Key system).

IPDM E/R

Controls the integrated relays and supplies voltage to the load according to the request from the BCM 
via CAN communication.

Stop lamp switch

Transmits power when the brake pedal is pressed to operate stop lamps.

Combination meter

Refer to 

MWI-8, "METER SYSTEM : System Description"

.

Daytime light relay
(if equipped)

Sends power to the daytime lamp when operated by the IPDM E/R.

Front door switch LH/RH

Transmits the door open signal to the BCM.

Rear door switch LH/RH

Optical sensor

Optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal 
to BCM to operate the autolight system.

Parking brake switch

Transmits the parking brake switch signal to the combination meter to operate the autolight system.

Hazard switch

Inputs the hazard switch signal to BCM.

EXL-8

< SYSTEM DESCRIPTION >

SYSTEM

SYSTEM

HEADLAMP SYSTEM
HEADLAMP SYSTEM : System Diagram

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HEADLAMP SYSTEM : System Description

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LOW BEAM OPERATION

When the lighting switch is in 2nd position, the BCM receives input requesting the headlamps to illuminate.

This input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R

controls the headlamp low relay coil which supplies power to the low beam headlamps. 

HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION

With the lighting 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 across the CAN communication lines. The CPU of the

combination meter controls the ON/OFF status off the HIGH BEAM indicator. The CPU of the IPDM E/R con-

trols the headlamp high relay coil which supplies power to the high beam headlamps.

The combination meter receives a high beam request signal (ON) through 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 a period of time, unless the lighting switch position

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

AUTO LIGHT SYSTEM

AWLIA1980GB

SYSTEM

EXL-9

< SYSTEM DESCRIPTION >

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AUTO LIGHT SYSTEM : System Diagram

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AUTO LIGHT SYSTEM : System Description

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

switch and ignition switch.

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

lamps and headlamps according to CAN communication signals from BCM.

• Optical sensor detects ambient brightness of 800 to 2,500 lux. And optical sensor converts light (lux) to volt-

age, then sends the optical sensor signal to BCM.

OUTLINE

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

When the lighting switch is in AUTO position, it automatically turns ON/OFF the parking, license plate, tail,

front fog lamps and headlamps in accordance with the ambient light. Sensitivity can be adjusted. For the

details of the setting, Refer to 

EXL-19, "HEADLAMP : CONSULT Function (BCM - HEAD LAMP)"

.

DAYTIME RUNNING LIGHT SYSTEM
DAYTIME RUNNING LIGHT SYSTEM : System Diagram

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DAYTIME RUNNING LIGHT SYSTEM : System Description

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System Description

The daytime light system is equipped with a daytime light control that activates the daytime lights when the

engine is operating. If the parking brake is applied, the daytime lights will turn OFF. The daytime lights will turn

ON when the parking brake is released. 

AWLIA1981GB

AWLIA2058GB

EXL-10

< SYSTEM DESCRIPTION >

SYSTEM

OPERATION 

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

switch) to determine when to operate 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 daytime lights.   

FRONT FOG LAMP SYSTEM
FRONT FOG LAMP SYSTEM : System Diagram

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FRONT FOG LAMP SYSTEM : System Description

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The front fog lamps are activated with the combination switch (lighting and turn signal switch). The lighting

switch signal to the BCM is monitored with the BCM combination switch reading function. When the fog lamps

are turned ON with the lighting switch, the BCM sends a front fog lamp request signal via CAN communication

lines to the IPDM E/R. The IPDM E/R grounds the front fog lamp relay coil to activate the front fog lamps.

FRONT FOG LAMP OPERATION

When the lighting switch is in front fog lamp ON position and also in 1st or 2nd position or AUTO position

(headlamp is ON), the BCM detects FR FOG ON and the HEAD LAMP 1, 2 ON or the AUTO LIGHT ON. The

BCM sends a front fog lamp request ON signal via the CAN communication lines to the IPDM E/R. The IPDM

E/R then turns ON the front fog lamp relay sending power to the front fog lamps.

TURN SIGNAL AND HAZARD WARNING LAMPS
TURN SIGNAL AND HAZARD WARNING LAMPS : System Diagram

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TURN SIGNAL AND HAZARD WARNING LAMPS : System Description

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TURN SIGNAL OPERATION

AWLIA1719GB

AWLIA1721GB