Rear Blower Motor
REAR BLOWER MOTOR
Diagnosis Procedure
Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.
REAR BLOWER MOTOR 1
1. CHECK FUSE
Check 20A fuse [No. 70, located in the fuse block (J/B)].
Is the inspection result normal?
YES- GO TO 2.
NO- Replace the blown fuse after repairing the affected circuit.
2. CHECK POWER SUPPLY FOR BLOWER MOTOR
1.Turn ignition switch ON.
2.Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 7.
3. CHECK POWER SUPPLY FOR REAR BLOWER MOTOR RESISTOR 1
Check voltage between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 8.
4. CHECK BLOWER MOTOR CONTROL SIGNAL
1.Turn mode control to VENT.
2.Turn fan control to 1st speed.
3.Check voltage between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES- GO TO 5.
NO-1- Less than approximately 2.5 V: GO TO 9.
NO-2- More than approximately 10 V: Replace auto amp.
5. CHECK REAR BLOWER MOTOR RESISTOR 1 GROUND CIRCUIT
1.Disconnect rear blower motor resistor 1 connector.
Revision: March 20122013 Infiniti JX
2.Check continuity between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.
6. CHECK BLOWER MOTOR FEEDBACK SIGNAL
1.Reconnect rear blower motor resistor 1 connector.
2.Turn ignition switch ON.
3.Turn fan control to 1st speed.
4.Check voltage between auto amp. harness connector and ground.
Is the inspection result normal?
YES- Replace auto amp.
NO- Repair harness or connector.
7. CHECK POWER SUPPLY OF BLOWER RELAY
1.Turn ignition switch OFF.
2.Remove blower relay.
3.Turn ignition switch ON.
4.Check voltage between rear blower relay connector terminals and ground.
Is the inspection result normal
YES- Check rear blower motor relay. Refer to "Component Inspection (Rear Blower Motor Relay)" .
NO- Repair harness or connector.
8. CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND REAR BLOWER MOTOR RESISTOR
1
1.Turn ignition switch OFF.
2.Disconnect rear blower motor resistor 1 connector.
3.Check continuity between blower motor harness connector and rear blower motor resistor 1 harness connector.
Is the inspection result normal?
Revision: March 20122013 Infiniti JX
YES- Replace blower motor.
NO- Repair harness or connector.
9. CHECK REAR BLOWER MOTOR RESISTOR 1
Check rear blower motor resistor 1 Refer to "Component Inspection (Rear Blower Motor Relay)" .
Is the inspection result normal?
YES- Replace auto amp.
NO- Replace rear blower motor resistor 1.
REAR BLOWER MOTOR 2
1. CHECK FUSE
Check 20A fuse [Nos. 71, located in the fuse block (J/B)].
Is the inspection result normal?
YES- GO TO 2.
NO- Replace fuse after repairing the affected circuit.
2. CHECK POWER SUPPLY FOR BLOWER MOTOR
1.Turn ignition switch ON.
2.Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 7.
3. CHECK POWER SUPPLY FOR REAR BLOWER MOTOR RESISTOR 2
Check voltage between rear blower motor resistor 2 harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 8.
4. CHECK BLOWER MOTOR CONTROL SIGNAL
1.Turn mode control to VENT.
2.Turn fan control to 1st speed.
3.Check voltage between rear blower motor resistor 2 harness connector and ground.
Is the inspection result normal?
YES- GO TO 5.
NO-1- Less than approximately 2.5 V: GO TO 9.
NO-2- More than approximately 10 V: Replace auto amp.
Revision: March 20122013 Infiniti JX
5. CHECK REAR BLOWER MOTOR RESISTOR 2 GROUND CIRCUIT
1.Disconnect rear blower motor resistor 2 connector.
2.Check continuity between rear blower motor resistor 2 harness connector and ground.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.
6. CHECK BLOWER MOTOR FEEDBACK SIGNAL
1.Reconnect rear blower motor resistor 2 connector.
2.Turn ignition switch ON.
3.Turn fan control to 1st speed.
4.Check voltage between auto amp. harness connector and ground.
Is the inspection result normal?
YES- Replace auto amp.
NO- Repair harness or connector.
7. CHECK POWER VOLTAGE OF BLOWER RELAY
1.Turn ignition switch OFF.
2.Remove blower relay.
3.Turn ignition switch ON.
4.Check voltage between rear blower relay connector terminals and ground.
Is the inspection result normal
YES- Check rear blower motor relay. Refer to "Component Inspection (Rear Blower Motor Relay)" .
NO- Repair harness or connector.
8. CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND REAR BLOWER MOTOR RESISTOR
2
1.Turn ignition switch OFF.
2.Disconnect rear blower motor resistor 2 connector.
3.Check continuity between blower motor harness connector and rear blower motor resistor 2 harness connector.
Revision: March 20122013 Infiniti JX
Is the inspection result normal?
YES- Replace blower motor.
NO- Repair harness or connector.
9. CHECK REAR BLOWER MOTOR RESISTOR 2
Check rear blower motor resistor 2. Refer to "Component Inspection (Rear Blower Motor Resistor)" .
Is the inspection result normal?
YES- Replace auto amp.
NO- Replace rear blower motor resistor 2.
Component Inspection (Rear Blower Motor)
1. CHECK FRONT BLOWER MOTOR
1.Connect battery voltage to terminal 1 of front blower motor.
2.Connect ground to terminal 2 of front blower motor.
Does the front blower fan operate?
YES- Intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace front blower motor. Refer to "FRONT BLOWER MOTOR : Removal and Installation" Front Blower Motor.
Component Inspection (Rear Blower Motor Relay)
1. CHECK REAR BLOWER RELAY
1.Remove rear blower relay. Refer to "Terminal Arrangement" Fuse, Fusible Link and Relay Box.
2.Check continuity between rear blower relay terminals 3 and 5, then 6 and 7 when voltage is supplied between terminals 1 and
2.
Is the inspection result normal?
YES- Inspection End.
NO- Replace rear blower relay.
Component Inspection (Rear Blower Motor Resistor)
1. CHECK FAN CONTROL AMP.
1.Turn ignition switch OFF.
2.Remove rear blower motor resistor. Refer to "Removal and Installation" Service and Repair.
3.Check continuity between the rear blower motor resistor terminals using analog circuit tester.
Is the inspection result normal?
Revision: March 20122013 Infiniti JX
YES- Inspection End.
NO- Replace rear blower motor resistor.
Revision: March 20122013 Infiniti JX