Diagnostic Procedure 2

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 Power Supply Circuit For Steering Lock Control Unit
- Turn ignition switch OFF.
- Disconnect steering lock control unit connector.
- Check voltage between steering lock control unit connector M69 terminal 1 (Y/G) and ground.
  
  Fig 1: Checking Power Supply Circuit For Steering Lock Control Unit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  1 (Y/G) - Ground : Battery voltage
OK or NG
1. OK : GO TO 2.
2. NG : Check the following.
  - 10A fuse [No. 6, located in the fuse block (J/B)]
  - Harness for open or short between fuse block and steering lock control unit
Check Ground Circuit For Steering Lock Control Unit
Check voltage continuity steering lock control unit connector M69 terminal 4 (B) and ground.

4 (B) - Ground : Continuity should exist.

OK or NG
1. OK : GO TO 3.
2. NG : Repair or replace harness.
  
  Fig 2: Checking Ground Circuit For Steering Lock Control Unit
  Courtesy of NISSAN MOTOR CO., U.S.A.
Check Electronic Key Insert Signal
1. Connect steering lock control unit connector.
2. Check voltage between steering lock control unit connector M69 terminal 2 (PU/W) and ground.
  
  Fig 3: Checking Electronic Key Insert Signal (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Electronic Key Insert Signal (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 4.
2. NG : Check the following.
  - Check harness for open or short between key switch and steering lock control unit.
Check Steering Lock Control Unit
Insert the electronic key into the ignition key cylinder, and immediately check voltage between steering control unit connector M69 terminal 3 (L) and ground.

Fig 5: Checking Steering Lock Control Unit (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 6: Checking Steering Lock Control Unit (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : Replace steering lock control unit.
2. NG :
  - Replace NATS IMMU.
  - Check harness for open or short between NATS IMMU and steering lock control unit.