Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FRONT BLOWER MOTOR RELAY SUPPLY VOLTAGE

Disconnect front blower motor relay.

Check voltage between front blower motor relay connector and ground.

Front blower motor relay

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

J-4

Ignition: OFF

Battery voltage

Is the inspection result normal?

YES

GO TO 2.

Repair or replace harness or connectors.

CHECK FRONT BLOWER MOTOR RELAY CONTROL SIGNAL VOLTAGE

Check voltage between front blower motor relay connector and ground.

Front blower motor relay		Ground	Condition	Voltage (Approx.)
Connector	Terminal
J-4	2	--	Ignition: OFF	0V
			Ignition: ON	Battery voltage

Is the inspection result normal?

YES

GO TO 4.

GO TO 3.

CHECK FRONT BLOWER MOTOR RELAY CONTROL SIGNAL CIRCUIT

Turn the push-button ignition switch OFF.
Disconnect BCM connector M19.

Check continuity between BCM connector and front blower motor relay connector.

BCM		Front blower motor relay		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M19	66	J-4	2	Yes

Check continuity between BCM connector and ground.

BCM		Ground	Continuity
Connector	Terminal
M19	66	--	No

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

Repair or replace harness or connectors.

CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT

Turn the push-button ignition switch OFF.

Check continuity between front blower motor relay connector and ground.

Front blower motor relay		Ground	Continuity
Connector	Terminal
J-4	1	--	Yes

Is the inspection result normal?

YES

Replace front blower motor relay.

Repair or replace harness or connectors.