Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FRONT BLOWER MOTOR RELAY CONTROL SIGNAL VOLTAGE
- Remove front blower motor relay.
- Check voltage between front blower motor relay connector J-4 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 3
NO
GO TO 2
- CHECK FRONT BLOWER MOTOR RELAY CONTROL SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect BCM connector M20.
- Check continuity between BCM connector M20 and front blower motor relay connector J-4.
BCM
Front blower motor relay
Continuity
Connector
Terminal
Connector
Terminal
M20
66
J-4
2
Yes
- Check continuity between BCM connector M20 and ground.
BCM
Ground
Continuity
Connector
Terminal
M20
66
-
No
Is the inspection result normal?
YES
Replace BCM. Refer to Removal and Installation .
NO
Repair or replace harness or connectors.
- CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT
- Turn ignition switch OFF.
- Check continuity between front blower motor relay connector J-4 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.
NO
Repair or replace harness or connectors.