Nissan Sentra B18 (2020-2025) Service Manual: Back-Up Lamp Relay Circuit

Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Exterior Lighting System :: Led Headlamp / Dtc/circuit Diagnosis / Back-Up Lamp Relay Circuit

Component Function Check

Component Function Check

CHECK BACK-UP LAMP OPERATION

Ignition switch ON.

With operating the shift selector, check that the back-up lamp is turned ON.

Shift selector R position	: Back-up lamp ON
Shift selector other than R position	: Back-up lamp OFF

Is the inspection result normal?

YES >>

Back-up lamp circuit is normal.

NO >>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

Check if the following fuse is not blown:

Signal name	Location	Fuse No.	Capacity
Battery power supply (back-up lamp relay)	IPDM E/R	89	10 A

Is the fuse blown (open)?

YES >>

Replace the blown fuse after repairing the affected circuit.

NO >>

GO TO 2.

CHECK BACK-UP LAMP RELAY POWER

Disconnect back-up lamp relay connector.
Ignition switch ON.

Check voltage between back-up lamp relay harness connector and ground.

Back-up lamp relay	—	Voltage (Approx.)
F61	7	Ground	Battery voltage
8

Back-up lamp relay

—

Voltage

(Approx.)

Connector

Terminal

F61

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness or connectors.

CHECK BACK-UP LAMP RELAY CONTROL SIGNAL VOLTAGE

Connect back-up lamp relay connector.

Check voltage between TCM harness connector and ground.

+		—	Condition		Voltage (Approx.)
TCM
Connector	Terminal
F23	29	Ground	Shift selector	R position	0 V
F23	29	Ground	Shift selector	Other than R position	Battery voltage

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

GO TO 4.

CHECK BACK-UP LAMP RELAY CONTROL SIGNAL CIRCUIT

Ignition switch OFF.
Disconnect TCM connector and back-up lamp relay connector.

Check continuity between TCM harness connector and back-up lamp relay harness connector.

TCM		Back-up lamp relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F23	29	F61	9	Yes

Check continuity between TCM harness connector and ground.

TCM		Ground	Continuity
Connector	Terminal
F23	29		No

Is the inspection result normal?

YES >>

Replace TCM. Refer to Removal and Installation.

NO >>

Repair or replace harness or connectors.

CHECK BACK-UP LAMP RELAY
1. Check back-up lamp relay. Refer to Component Inspection.
Is the inspection result normal?
YES >>
GO TO 6.
NO >>
Replace back-up lamp relay.

CHECK BACK-UP LAMP POWER SUPPLY CIRCUIT

Ignition switch OFF.
Disconnect back-up lamp relay connector, rear combination lamp LH (trunk lid side) connector and rear combination lamp RH (trunk lid side) connector.

Check continuity between back-up lamp relay harness connector and rear combination lamp (trunk lid side) harness connector.

Back-up lamp relay			Rear combination lamp (trunk lid side)		Continuity
Connector		Terminal	Connector	Terminal	Continuity
RH	F61	6	B75	2	Yes
LH	F61	6	B88	2	Yes

Check continuity between back-up lamp relay harness connector and ground.

Back-up lamp relay		Ground	Continuity
Connector	Terminal
F61	6		No

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace harness or connectors.

CHECK BACK-UP LAMP GROUND CIRCUIT

Check continuity between rear combination lamp (trunk lid side) harness connector and ground.

Rear combination lamp (trunk lid side)			—	Continuity
Connector		Terminal	—	Continuity
RH	B75	4	Ground	Yes
LH	B88	4	Ground	Yes

Is the inspection result normal?

YES >>

Replace corresponding rear combination lamp (trunk lid side) bulb. Refer to Bulb Replacement.

NO >>

Repair or replace harness or connectors.

Component Inspection

Component Inspection

CHECK BACK-UP LAMP RELAY

Ignition switch OFF.
Disconnect back-up lamp relay connector.
Check continuity between back-up lamp relay terminals.

Back-up lamp relay		Condition	Continuity
Terminals		Condition	Continuity
7	8	12 V direct current supply between terminals 8 and 9.	Yes
7	8	No current supply	No

Is the inspection result normal?

YES >>

Inspection End.

NO >>

Replace back-up lamp relay.

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