Nissan Sentra B18 (2020-2025) Service Manual: Push-Button Ignition Switch Circuit

Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Power Control System :: Power Distribution System / Dtc/circuit Diagnosis / Push-Button Ignition Switch Circuit

Component Function Check

Component Function Check

CHECK FUNCTION

CONSULT

Ignition switch ON
Select “Push SW” in “Data Monitor” mode of “HANDS FREE MODULE”.
Check the push-button ignition switch signal under the following conditions:

Test item	Condition	Status
Push SW	Push-button ignition switch is pressed	On
Push SW	Push-button ignition switch is not pressed	Off

Is the indication normal?

YES>>

Push-button ignition switch circuit is normal.

NO>>

Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL OUTPUT VOLTAGE

Ignition switch OFF.
Disconnect push-button ignition switch connector.

Check voltage between push-button ignition switch harness connector and ground.

+	-	Voltage (Approx.)
M25	8	Ground	Battery voltage

Voltage

(Approx.)

Push-button ignition switch

Connector

Terminal

M25

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

GO TO 2.

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL CIRCUIT (OPEN)

Disconnect Intelligent Key unit connector.

Check continuity between push-button ignition switch harness connector and Intelligent Key unit harness connector.

Push-button ignition switch		Intelligent Key unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M25	8	M155	9	Yes

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH SIGNAL CIRCUIT (SHORT TO GROUND)

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal	—	Continuity
M25	8	Ground	No

Is the inspection result normal?

YES >>

Replace Intelligent Key unit. Refer to Removal and Installation.

NO >>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal	—	Continuity
M25	4	Ground	Yes

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Repair the harness or connector.

CHECK PUSH-BUTTON IGNITION SWITCH
1. Check push-button ignition switch. Refer to Component Inspection.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Replace push-button ignition switch. Refer to Removal and Installation.

Component Inspection

Component Inspection

CHECK PUSH-BUTTON IGNITION SWITCH

Ignition switch OFF.
Disconnect push-button ignition switch connector.

Check continuity between push-button ignition switch terminals.

Push-button ignition switch		Condition	Continuity
Terminals		Condition	Continuity
4	8	Pressed	Yes
4	8	Not pressed	No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace push-button ignition switch. Refer to Removal and Installation.

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