Nissan Sentra. Manual - part 474

TURN SIGNAL LAMP CIRCUIT

EXL-99

< DTC/CIRCUIT DIAGNOSIS >

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TURN SIGNAL LAMP CIRCUIT

Description

INFOID:0000000009757522

The BCM monitors inputs from the combination switch to determine when to activate the turn signals. The

BCM outputs voltage direction to the left and right turn signals during turn signal operation or both during haz-

ard warning operation. The BCM sends a turn signal indicator request to the combination meter via the CAN

communication lines. 

The BCM performs the fast flasher operation (fail-safe) if any bulb or harness of the turn signal lamp circuit is

open.

NOTE:

Turn signal lamp blinks at normal speed when using the hazard warning lamp.

Component Function Check

INFOID:0000000009757523

1.

CHECK TURN SIGNAL LAMP

CONSULT

1. Select FLASHER of BCM (FLASHER) active test item.

2. With operating the test items, check that the turn signal lamp blinks.

Does the turn signal lamp blink?

YES

>> Turn signal lamp circuit is normal.

NO

>> Refer to 

EXL-99, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009757524

Regarding Wiring Diagram information, refer to 

EXL-58, "Wiring Diagram"

.

1.

CHECK TURN SIGNAL LAMP BULB

Check the applicable lamp bulb to be sure the proper bulb standard is in use and the bulb is not open.
Is the bulb OK?

YES

>> GO TO 2.

NO

>> Replace the bulb.

2.

CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE

1. Turn the ignition switch OFF.

2. Disconnect the front or rear combination lamp harness connector or the door mirror harness connector (if

equipped with turn signal in mirror) in question.

3. Turn the ignition switch ON.

4. Operate the turn signal switch.

5. While the turn signal is operating, check the voltage between the front combination lamp harness connec-

tor and ground.

LH

: Turn signal lamps (LH) ON 

RH

: Turn signal lamps (RH) ON 

OFF

: The turn signal lamps OFF

(+)

(

−)

Voltage

(Approx.)

Connector

Terminal

EXL-100

< DTC/CIRCUIT DIAGNOSIS >

TURN SIGNAL LAMP CIRCUIT

6. While the turn signal is operating, check the voltage between the rear combination lamp harness connec-

tor and ground.

7. While the turn signal is operating, check the voltage between the door mirror harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK TURN SIGNAL LAMP CIRCUIT FOR OPEN 

1. Turn the ignition switch OFF.

2. Disconnect BCM harness connector in question.

3. Check continuity between the BCM harness connector and the front combination lamp harness connector.

With Intelligent Key

Without Intelligent Key

RH

E20 

4

Ground

LH

E21 

PKID0926E

(+)

(

−)

Voltage

(Approx.)

Connector

Terminal

RH

B42 

4

Ground

LH

B25 

(+)

(

−)

Voltage

(Approx.)

Connector

Terminal

RH

D106 

10

Ground

LH

D7 

PKID0926E

PKID0926E

BCM

Front combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

M85

85

E21

4

Yes

RH

84

E20

BCM

Front combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

B57

41

E21

4

Yes

RH

42

E20

TURN SIGNAL LAMP CIRCUIT

EXL-101

< DTC/CIRCUIT DIAGNOSIS >

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4. Check continuity between the BCM harness connector and the rear combination lamp harness connector. 

With Intelligent Key

Without Intelligent Key

5. Check continuity between the BCM harness connector and the door mirror harness connector in question.

With Intelligent Key

Without Intelligent Key

Is the inspection results normal?

YES

>> GO TO 4.

NO

>> Repair or replace the harness or connectors.

4.

CHECK TURN SIGNAL LAMP SHORT CIRCUIT 

1. Check continuity between the BCM harness connector and ground.

Are the inspection results normal?

YES

>> Replace BCM. Refer to 

BCS-73, "Removal and Installation"

 (with Intelligent Key system) or 

BCS-

126, "Removal and Installation"

 (without Intelligent Key system).

NO

>> Repair or replace the harness or connectors.

5.

CHECK TURN SIGNAL LAMP GROUND CIRCUIT

1. Turn the ignition switch OFF.

2. Check continuity between the front combination lamp harness connector or the rear combination lamp

harness connector or the door mirror harness connector in question and ground.

BCM

Rear combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

M85

85

B25

4

Yes

RH

84

B42

BCM

Rear combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

B57

41

B25

4

Yes

RH

42

B42

BCM

Rear combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

M85

85

D7

10

Yes

RH

84

D106

BCM

Rear combination lamp

Continuity

Connector

Terminal

Connector

Terminal

LH

B57

41

D7

10

Yes

RH

42

D106

BCM

Ground

Continuity

Connector

Terminal

M85 (with Intelligent 

Key)

84

No

85

B57 (without Intelli-

gent Key)

41

42

Front combination lamp

(

−)

Continuity

Connector

Terminal

EXL-102

< DTC/CIRCUIT DIAGNOSIS >

TURN SIGNAL LAMP CIRCUIT

3. Check continuity between the rear combination lamp harness connector and ground.

4. Check continuity between the door mirror harness connector and ground.

Are the inspection results normal?

YES

>> Replace the malfunctioning lamp.

NO

>> Repair or replace the harness or connectors.

LH

E21

7

Ground

Yes

RH

E20

Rear combination lamp

(

−)

Continuity

Connector

Terminal

LH

B25

6

Ground

Yes

RH

B42

Door mirror

(

−)

Continuity

Connector

Terminal

LH

D7

8

Ground

Yes

RH

D106