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Home >> Nissan-Datsun >> 2019 >> Sentra SL >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Security Control System (Without Intelligent Key System) >> Without Intelligent Key System >> DTC/Circuit Diagnosis >> DTC B2190: NATS Antenna Amp. >> DTC Diagnosis Procedure
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DTC Diagnosis Procedure

  1. CHECK NATS ANTENNA AMP. INSTALLATION 

    Check NATS antenna amp. installation. Refer to Removal and Installation .

    Is the inspection result normal?

    YES

    GO TO 2 .

    NO

    Reinstall NATS antenna amp. correctly.

  2. CHECK NVIS (NATS) IGNITION KEY ID CHIP 

    Start engine with another registered NATS ignition key.

    Does the engine start?

    YES

    • Ignition key ID chip is malfunctioning.
    • Replace the ignition key.
    • Perform initialization with CONSULT.

      For initialization, refer to CONSULT Immobilizer mode and follow the on-screen instructions.

    NO

    GO TO 3 .

  3. CHECK POWER SUPPLY FOR NATS ANTENNA AMP. 
    1. Turn ignition switch ON.
    2. Check voltage between NATS antenna amp. connector M42 terminal 1 and ground.

    1 - Ground

    : Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4 .

    NO

    Repair or replace fuse or harness.

  4. CHECK NATS ANTENNA AMP. GROUND LINE CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect NATS antenna amp. connector.
    3. Check continuity between NATS antenna amp. connector M42 terminal 3 and ground.

      3 - Ground

      : Continuity should exist.

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    • Repair or replace harness.
      NOTE: If harness is OK, replace BCM, refer to Removal and Installation . Perform initialization with CONSULT. For initialization, refer to CONSULT Immobilizer mode and follow the on-screen instructions.
  5. CHECK NATS ANTENNA AMP. SIGNAL LINE- 1 
    1. Connect NATS antenna amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between NATS antenna amp. connector M42 terminal 2 and ground with analog tester.

    Terminals

    Position of ignition key cylinder

    Voltage (V)

    (Approx.)

    (+)

    (-)

    2

    Ground

    Before inserting ignition key

    Battery voltage

    After inserting ignition key

    Pointer of tester should move for approx. 30 seconds, then return to battery voltage

    Just after turning ignition switch ON

    Pointer of tester should move for approx. 1 second, then return to battery voltage

    Is the inspection result normal?

    YES

    GO TO 6 .

    NO

    • Repair or replace harness.
      NOTE: If harness is OK, replace BCM, refer to Removal and Installation . Perform initialization with CONSULT. For initialization, refer to CONSULT Immobilizer mode and follow the on-screen instructions.
  6. CHECK NATS ANTENNA AMP. SIGNAL LINE- 2 

    Check voltage between NATS antenna amp. connector M42 terminal 4 and ground with analog tester.

    Terminals

    Position of ignition key cylinder

    Voltage (V)

    (Approx.)

    (+)

    (-)

    4

    Ground

    Before inserting ignition key

    Battery voltage

    After inserting ignition key

    Pointer of tester should move for approx. 30 seconds, then return to battery voltage

    Just after turning ignition switch ON

    Pointer of tester should move for approx. 1 second, then return to battery voltage

    Is the inspection result normal?

    YES

    NATS antenna amp. is malfunctioning. Replace NATS antenna amp. Refer to Removal and Installation .

    NO

    • Repair or replace harness.
      NOTE: If harness is OK, replace BCM, refer to Removal and Installation . Perform initialization with CONSULT. For initialization, refer to CONSULT Immobilizer mode and follow the on-screen instructions.
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