Rear Blower Motor Inoperative/On At All Times

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSES
Check 10A fuse [No. 19 (Located in the fuse block J/B)].

Fuse is good.

Is the inspection result normal?

YES: GO TO 2.

NO: GO TO 6.
CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY
1. Disconnect rear air control (front) harness connector.
2. Turn ignition switch ON.
3. Check voltage between rear air control (front) harness connector R108 terminal 1 and ground.
  Battery voltage should exist.
  
  Fig 1: Checking Voltage Between Rear Air Control (Front) Harness Connector R108 Terminal 1 And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: GO TO 3.
  
  NO: Repair harness or connector.
CHECK REAR AIR CONTROL (FRONT) LIN BUS VOLTAGE
Check voltage between rear air control (front) harness connector R108 terminal 5 and ground.

Battery voltage should exist.

Fig 2: Checking Voltage Between Rear Air Control (Front) Harness Connector R108 Terminal 5 And Ground
Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: GO TO 4.

NO: Repair harness or connector.
CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear air control (front) harness connector R108 terminal 6 and ground.
  Continuity should exist.
  
  Fig 3: Checking Continuity Between Rear Air Control (Front) Harness Connector R108 Terminal 6 And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: GO TO 5.
  
  NO: Repair harness or connector.
CHECK REAR AIR CONTROL (FRONT) LIN BUS CIRCUIT FOR OPEN
1. Disconnect A/C auto amp. connector.
2. Check continuity between A/C auto amp. harness connector M50 (A) terminal 48 and rear air control (front) harness connector R108 (B) terminal 5.
  Continuity should exist.
  
  Fig 4: Checking Continuity Between A/C Auto Amp. Connector M50 Terminal 48 And Rear Air Control (Front) Connector R108 Terminal 5
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".
  
  NO: Repair harness or connector.
REPLACE FUSE
1. Replace fuse.
2. Activate the rear blower motor.
  Does the fuse blow?
  
  YES: GO TO 7.
  
  NO: Inspection End.
CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect rear air control (front), (rear), and A/C auto amp. connectors.
3. Check continuity between rear air control (front) harness connector R108 terminal 1 and ground.
  1 - Ground: Continuity should not exist.
  
  Fig 5: Checking Continuity Between Rear Air Control (Front) Harness Connector R108 Terminal 1 And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: Repair harness or connector for a short.
  
  NO: System OK.