Door Mirror Defogger Power Supply Circuit Check

WARNING: This page is about a different car, the 2008 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE

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

FUSE REFERENCE

COMPONENT PARTS	TERMINAL NO. (SIGNAL)	AMPERE	FUSE NO.
Fuse block (J/B)	5N (Battery power supply)	10A	8

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 SUPPLY ROUTING CIRCUIT ".

CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT 1

Turn ignition switch ON.

Check voltage between fuse block (J/B) connector and ground.

TERMINAL VOLTAGE CONDITION CHART

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
E30	2Q	Ground	Rear window defogger switch ON	Battery voltage
E30	2Q	Ground	Rear window defogger switch OFF	0

Fig 1: Checking Voltage Between Fuse Block (J/B) Connector Terminal 20 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Repair or replace harness.

CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT 2

Check voltage between fuse block (J/B) connector and ground.

TERMINAL VOLTAGE CONDITION CHART

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M3	5N	Ground	Rear window defogger switch ON	Battery voltage
M3	5N	Ground	Rear window defogger switch OFF	0

Fig 2: Checking Voltage Between Fuse Block (J/B) Connector Terminal 5N And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 4.

NG: Replace fuse block (J/B).

CHECK DOOR MIRROR DEFOGGER CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuse block (J/B) and door mirror LH or RH.
3. Check continuity between fuse block (J/B) connector M3 terminal 5N and door mirror connector D13 (LH) or D113 (RH) terminal 6.
  5N - 6 : Continuity should exist.
OK or NG

OK: GO TO 5.

NG: Repair or replace harness.

Fig 3: Checking Continuity Between Fuse Block (J/B) Terminal 5N And Door Mirror Terminal 6
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK DOOR MIRROR DEFOGGER GROUND CIRCUIT
Check continuity between each door mirror connector D13 (LH) or D113 (RH) terminal 5 and ground.

5 - Ground : Continuity should exist.

OK or NG

OK: GO TO 6.

NG: Repair or replace harness.

Fig 4: Checking Continuity Between Door Mirror Connector Terminal 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK DOOR MIRROR DEFOGGER
Check continuity between each door mirror terminals 5 and 6.

6 - 5 : Continuity should exist.

OK or NG

OK: Repair or replace harness.

NG: Replace malfunctioning door mirror LH or RH. Refer to "DOOR MIRROR ASSEMBLY ".

Fig 5: Checking Continuity Between Each Door Mirror Terminals 5 And 6
Courtesy of NISSAN MOTOR CO., U.S.A.