Check Steering Lock Unit

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK STEERING LOCK UNIT POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect steering lock unit connector.
3. Check voltage between steering lock unit harness connector M311 terminal 1 and ground.
  1 (Y) - Ground: Battery voltage
OK or NG

OK: GO TO 2.

NG: Repair or replace steering lock unit power supply circuit.

Fig 1: Identifying Voltage Between Steering Lock Unit Connector M311 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK STEERING LOCK UNIT GROUND CIRCUIT
Check continuity between steering lock unit harness connector M311 terminal 4 and ground.

4 (G/R) - Ground: Continuity should exist .

OK or NG

OK: GO TO 3.

NG: GO TO 6.

Fig 2: Identifying Continuity Between Steering Lock Unit Connector M311 Terminal 4 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect steering lock unit connector.
2. Check voltage between Intelligent Key unit harness connector M75 terminal 1 and ground.
  1 (L/Y) - Ground: Approx. 5V
OK or NG

OK: GO TO 4.

NG: Replace Intelligent Key unit.

Fig 3: Identifying Voltage Between Intelligent Key Unit Connector M75 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK STEERING LOCK COMMUNICATION SIGNAL

Check signal between Intelligent Key unit connector M75 terminal 32 and ground with oscilloscope.

TERMINALS SIGNALS REFERENCE

Connector	Terminal (Wire color)		Condition	Signal (V) (Reference value)
Connector	(+)	(-)	Condition	Signal (V) (Reference value)
M75	32 (L/OR)	Ground	Ignition switch is pushed	Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Identifying Signal Between Intelligent Key Unit Connector M75 Terminal 32 And Ground

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

OK or NG

OK: GO TO 5.

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 harness connector M75 terminals 1, 31, 32 and steering lock unit connector M311 terminals 2, 3, 4.
  1 (L/Y) - 2 (L/Y): Continuity should exist .
  
  31 (G/R) - 4 (G/R): Continuity should exist .
  
  32 (L/OR) - 3 (L/OR): Continuity should exist .
3. Check continuity between steering lock unit harness connector M311 terminals 2, 3, 4 and ground.
  2 (L/Y) - Ground: Continuity should not exist .
  
  3 (L/OR) - Ground: Continuity should not exist .
  
  4 (G/R) - Ground: Continuity should not exist .
  
  Fig 5: Identifying Continuity Between Steering Lock Unit Connector M311 Terminals 2, 3, 4 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: Replace steering lock unit.
- After replacing steering lock unit, perform registration procedure. Refer to "CONSULT-II Operation Manual NATS".
NG: Repair or replace harness between steering lock unit and Intelligent Key unit.
CHECK STEERING LOCK UNIT COMMUNICATION CIRCUIT
1. Disconnect Intelligent Key unit connector.
2. Check continuity between Intelligent Key unit harness connector M75 terminal 31 and steering lock unit connector M311 terminal 4.
  31 (G/R) - 4 (G/R): Continuity should exist .
3. Check continuity between steering lock unit harness connector M311 terminal 4 and ground.
  4 (G/R) - Ground: Continuity should not exist .
OK or NG

OK: Replace Intelligent Key unit.

NG: Repair or replace harness between steering lock unit and Intelligent Key unit.

Fig 6: Identifying Continuity Between Steering Lock Unit Connector M311 Terminal 4 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.