Symptom 2. 4WD Warning Lamp Does Not Turn ON

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Although ignition switch is turned "ON", 4WD warning lamp does not turn ON.

CHECK TRANSFER CONTROL UNIT POWER SOURCE

Fig 1: Identifying 4WD Warning Lamp (Meter) Connection With Transfer Control Unit
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Turn ignition switch to "OFF" position and disconnect transfer control unit harness connector.
2. Turn ignition switch to "ON" position. (Do not start engine.)
3. Check voltage between transfer control unit harness connector terminals 16, 22 and body ground.
  Voltage: Battery voltage
  
  Fig 2: Checking Voltage Between Transfer Control Unit And Body Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG:
  Check the following.
  - Continuity between ignition switch and transfer control unit
  - Ignition switch and No. 18 fuse (10A)
CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to "OFF" position.
2. Disconnect transfer control unit harness connector.
3. Measure resistance between transfer control unit harness connector terminals 6, 45 and body ground.
  Resistance: 0Ω.
  
  Fig 3: Checking Transfer Control Unit Ground Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Check continuity between transfer control unit and body ground.
CHECK 4WD WARNING LAMP CIRCUIT
Check the following.
- 4WD warning lamp
- Continuity between ignition switch and 4WD warning lamp
- Continuity between 4WD warning lamp and transfer control unit
OK or NG
1. OK: GO TO 4.
2. NG:
  - Repair or replace harness or connector.
  - Replace 4WD warning lamp.
CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.

OK or NG
1. OK: INSPECTION END
2. NG:
  1. Perform transfer control unit input/output signal inspection. Refer to "TRANSFER CONTROL UNIT INSPECTION TABLE ", "TROUBLE DIAGNOSIS - GENERAL DESCRIPTION".
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.