Nissan Frontier D40. Manual - part 637

TRAILER TOW

EXL-21

< FUNCTION DIAGNOSIS >

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Component Parts Location

INFOID:0000000005561509

Component Description

INFOID:0000000005561510

1.

Stop lamp switch E38 (manual trans-
mission) or E39 (automatic transmis-
sion) (view with lower instrument panel 
LH removed)

2.

Brake pedal

3.

BCM, M18, M19, M20 (view with lower 
instrument panel LH removed)

4.

Trailer turn relay LH E164

5.

IPDM E/R E121, E122, E124

6.

Trailer turn relay RH E165

7.

Trailer tow relay 2 E228

8.

Trailer tow relay 1 E227

9.

Combination switch (lighting and turn 
signal switch) M28

10. Combination meter M24

AWLIA1765GB

Part name

Description

BCM

• Receives lighting and turn signal requests from combination 

switch (lighting and turn signal switch).

• Receives stop lamp signal requests from combination meter via 

CAN communication.

• Sends lighting signal request to the IPDM E/R to control the tail 

lamp relay via CAN communication.

• Sends turn/hazard/brake control signal to the trailer turn relays.

IPDM E/R

Activates the tail lamp relay upon request from the BCM via CAN 
communication.

Combination meter

• Receives stop lamp switch signal from stop lamp switch.
• Sends stop lamp signal request to the BCM via CAN communi-

cation.

Combination switch (lighting and turn signal switch)

Outputs lighting and turn signal requests to the BCM.

EXL-22

< FUNCTION DIAGNOSIS >

COMBINATION SWITCH READING SYSTEM

COMBINATION SWITCH READING SYSTEM

System Diagram

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System Description

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OUTLINE

• BCM reads the status of the combination switch (light, turn signal, wiper and washer) and recognizes the

status of each switch.

• BCM is a combination of 5 output terminals (OUTPUT 1 - 5) and 5 input terminals (INPUT 1 - 5). It reads a

maximum of 20 switch status.

COMBINATION SWITCH MATRIX

LIIA1323E

COMBINATION SWITCH READING SYSTEM

EXL-23

< FUNCTION DIAGNOSIS >

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Combination switch circuit

Combination switch INPUT-OUTPUT system list

NOTE:

Headlamp has a dual system switch.

COMBINATION SWITCH READING FUNCTION

Description

• BCM reads the status of the combination switch at 10ms interval normally.

NOTE:
BCM reads the status of the combination switch at 20ms interval when BCM is controlled at low power con-
sumption control mode.

• BCM operates as follows and judges the status of the combination switch.
- INPUT 1 - 5 outputs the voltage waveforms of 5 systems simultaneously.
- It operates the transistor on OUTPUT side in the following order: OUTPUT 5 

→

 4 

→

 3 

→

 2 

→

 1.

System

OUTPUT 1

OUTPUT 2

OUTPUT 3

OUTPUT 4

OUTPUT 5

INPUT 1

—

FR WASHER

FR WIPER LOW

TURN LH

TURN RH

INPUT 2

FR WIPER HI

—

FR WIPER INT

PASSING

HEADLAMP 1

INPUT 3

INT VOLUME 1

—

—

HEADLAMP 2

HI BEAM

INPUT 4

—

INT VOLUME 3

AUTO LIGHT

—

TAIL LAMP

INPUT 5

INT VOLUME 2

—

—

FR FOG

—

LIIA1325E

JPMIA0067GB

EXL-24

< FUNCTION DIAGNOSIS >

COMBINATION SWITCH READING SYSTEM

- The voltage waveform of INPUT corresponding to the formed circuit changes according to the operation of

the transistor on OUTPUT side if any (1 or more) switches are ON.

- It reads this change of the voltage as the status signal of the combination switch.

Operation Example

In the following operation example, the combination of the status signals of the combination switch is replaced
as follows: INPUT 1 - 5 to “1 - 5” and OUTPUT 1 - 5 to “A - E”.

Example 1: When a switch (TURN RH switch) is turned ON

• The circuit between INPUT 1 and OUTPUT 5 is formed when the TURN RH switch is turned ON.

• BCM detects the combination switch status signal “1E” when the signal of OUTPUT 5 is input to INPUT 1.
• BCM judges that the TURN RH switch is ON when the signal “1E” is detected.

Example 2: When some switches (turn RH switch, front wiper LO switch) are turned ON

JPMIA0068GB

JPMIA0073GB