Check Steering Lock Unit

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STEERING LOCK UNIT POWER SUPPLY
1. Turn ignition knob LOCK position.
2. Disconnect steering lock unit connector.
3. Check voltage between steering lock unit connector M26 terminal 1 (L/R) and ground.
  1. 1 (L/R) - Ground : Battery voltage
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace steering lock unit power supply circuit.
Fig 1: Checking Voltage Between Steering Lock Unit Connector M26 Terminal 1 (L/R) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK STEERING LOCK UNIT GROUND CIRCUIT
Check continuity between steering lock unit connector M26 terminal 4 (Y/B) and ground.
1. 4 (Y/B) - Ground : Continuity should exist.
OK or NG
1. OK : GO TO 3.
2. NG : GO TO 4.
Fig 2: Checking Continuity Between Steering Lock Unit Connector M26 Terminal 4 (Y/B) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK STEERING LOCK COMMUNICATION CIRCUIT
1. Connect steering lock unit connector.
2. Check voltage between Intelligent Key unit connector M34 terminal 1 (R/W) and ground.
  1. 1 (R/W) - Ground : Approx. 5V
  Fig 3: Checking Voltage Between Intelligent Key Unit Connector M34 Terminal 1 (R/W) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Immediately after pushing ignition knob, use an oscilloscope to check voltage waveform between Intelligent Key unit connector M34 terminal 32 (R/B) and ground.
  
  Fig 4: Terminal Condition Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Voltage Waveform Between Intelligent Key Unit Connector M34 Terminal 32 (R/B) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 4.
2. NG : Replace Intelligent Key unit.
CHECK STEERING LOCK UNIT COMMUNICATION CIRCUIT
1. Disconnect Intelligent Key unit and steering lock unit connectors.
2. Check continuity between Intelligent Key unit connector M34 terminals 1, 31, 32 and steering lock unit connector M26 terminals 2, 3, 4.
  1. 1 (R/W) - 2 (R/W) : Continuity should exist.
  2. 31 (Y/B) - 4 (Y/B) : Continuity should exist.
  3. 32 (R/B) - 3 (R/B) : Continuity should exist.
  Fig 6: Checking Steering Lock Unit Communication Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between steering lock unit connector M26 terminals 2, 3, 4 and ground.
  1. 2 (R/W) - Ground : Continuity should not exist.
  2. 3 (R/B) - Ground : Continuity should not exist.
  3. 4 (Y/B) - Ground : Continuity should not exist.
OK or NG
1. OK : Replace steering lock unit.
  - After replacing steering lock unit, perform registration procedure. Refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".
2. NG : Repair or replace harness between steering lock unit and Intelligent Key unit.