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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Security Control System (With Intelligent Key System) >> DTC/Circuit Diagnosis >> DTC P1614: Chain Of IMMU-Key >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check that the following fuse in IPDM E/R is not blown.
      Signal name Fuse No.
      Battery power supply 51

      Is the fuse fusing? 

      YES: Replace the blown fuse after repairing the cause of blowing.

      NO: GO TO 2.

  2. CHECK NATS ANTENNA AMP. POWER SUPPLY 
    1. Disconnect NATS antenna amp. connector.
    2. Check voltage between NATS antenna amp. harness connector and ground.
      (+) (-) Voltage (V) (Approx.)
      NATS antenna amp.
      Connector Terminal
      M130 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. CHECK NATS ANTENNA AMP. POWER SUPPLY CIRCUIT 
    1. Disconnect IPDM E/R connector.
    2. Check continuity between IPDM E/R harness connector and NATS antenna amp. connector.
      IPDM E/R NATS antenna amp. Continuity
      Connector Terminal Connector Terminal
      E5 10 M130 1 Existed
    3. Check continuity between IPDM E/R harness connector and ground.
      IPDM E/R Ground Continuity
      Connector Terminal
      E5 10 Not existed

      Is the inspection result normal? 

      YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

  4. CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 1 
    1. Connect NATS antenna amp. connector.
    2. Disconnect BCM connector.
    3. Check voltage between BCM harness connector and ground.
      (+) (-) Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M120 21 Ground 12

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 1 
    1. Disconnect NATS antenna amp. connector.
    2. Check continuity between BCM harness connector and NATS antenna amp. connector.
      BCM NATS antenna amp. Continuity
      Connector Terminal Connector Terminal
      M120 21 M130 2 Existed
    3. Check continuity between BCM harness connector and ground.
      BCM Ground Continuity
      Connector Terminal
      M120 21 Not existed

      Is the inspection result normal? 

      YES: Replace NATS antenna amp. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

  6. CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 1 
    1. Connect NATS antenna amp. connector.
    2. Connect BCM connector.
    3. Check voltage between BCM harness connector and ground using analog tester.
      (+) (-) Condition Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M120 21 Ground Contact Intelligent Key backside to push-button ignition switch, then turn ignition switch ON. Just after pressing push-button ignition switch, pointer of analog tester should move.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Replace NATS antenna amp. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK NATS ANTENNA AMP. OUTPUT SIGNAL 2 
    1. Disconnect BCM connector.
    2. Check voltage between BCM harness connector and ground.
      (+) (-) Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M120 25 Ground 12

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT 2 
    1. Disconnect NATS antenna amp. connector.
    2. Check continuity between BCM harness connector and NATS antenna amp. connector.
      BCM NATS antenna amp. Continuity
      Connector Terminal Connector Terminal
      M120 25 M130 3 Existed
    3. Check continuity between BCM harness connector and ground.
      BCM Ground Continuity
      Connector Terminal
      M120 25 Not existed

      Is the inspection result normal? 

      YES: Replace NATS antenna amp. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

  9. CHECK NATS ANTENNA AMP. COMMUNICATION SIGNAL 2 
    1. Connect NATS antenna amp. connector.
    2. Connect BCM connector.
    3. Check voltage between BCM harness connector and ground using analog tester.
      (+) (-) Condition Voltage (V) (Approx.)
      BCM
      Connector Terminal
      M120 25 Ground Contact Intelligent Key backside to push-button ignition switch, then turn ignition switch ON. Just after pressing push-button ignition switch, pointer of analog tester should move.

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Replace NATS antenna amp. Refer to "REMOVAL AND INSTALLATION ".

  10. CHECK NATS ANTENNA AMP. GROUND CIRCUIT 
    1. Disconnect NATS antenna amp. connector.
    2. Check continuity between NATS antenna amp. harness connector and ground.
      NATS antenna amp. Ground Continuity
      Connector Terminal
      M130 4 Existed

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair or replace harness.

  11. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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