Door Mirror Defogger Power Supply Circuit Check

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE

Turn ignition switch OFF.

Check if the following fuse for Fuse block (J/B) is blown.

FUSE CONDITION INSPECTION CHART

COMPONENT PARTS	TERMINAL NO. (SIGNAL)	AMPERE	FUSE NO.
Fuse block (J/B)	3A (BAT power supply)	10A	#4

NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

OK or NG

OK: GO TO 2.
NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to POWER DISTRIBUTION .

DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT INSPECTION 1
1. Disconnect door mirror defogger relay connector.
2. Turn ignition switch ON.
3. push the rear window defogger switch.
4. Check voltage between door mirror defogger relay connector and ground.
  
  Fig 1: Checking Door Mirror Defogger Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Identifying Terminals Connector Voltage Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace between harness rear window defogger and door mirror defogger relay and door mirror defogger relay.
DOOR MIRROR DEFOGGER RELAY INSPECTION
1. Turn ignition switch OFF.
2. Remove door mirror defogger relay.
3. Check continuity between terminals 3 and 5.
  
  Fig 3: Checking Door Mirror Defogger Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Identifying Terminal Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Replace door mirror defogger relay.
DOOR MIRROR DEFOGGER RELAY GROUND HARNESS INSPECTION
Check continuity between door mirror defogger relay connector B10 terminal 1 (B) and ground.
1. 1 (B) - ground: Continuity should exist.
Fig 5: Checking Door Mirror Defogger Relay Ground Harness
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace harness between door mirror defogger relay and ground.
DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT INSPECTION
Check voltage between door mirror defogger relay connector B10 terminal 5 (P/B) and ground.
1. 5 (P/B) - Ground: Battery voltage
Fig 6: Checking Door Mirror Defogger Power Supply Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the harness for open or short between door mirror defogger relay and door mirror.
2. NG: Repair or replace harness between fuse block (J/B) No.1 and door mirror defogger relay.