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Home › Infiniti › 2013 › M35h › Repair and Diagnosis › Body & Frame › Door Locks › Security Control System › DTC/Circuit Diagnosis › Horn Function › Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START 

    Perform inspection in accordance with procedure that confirms malfunction.

    Which procedure confirms malfunction? 

    Component Function Check 1: GO TO 2.

    Component Function Check 2: GO TO  4.

  2. CHECK HORN FUNCTION 

    Check horn function using horn switch.

    Do the horn sound? 

    YES: GO TO 3.

    NO: Check horn circuit. Refer to "WIRING DIAGRAM ".

  3. CHECK HORN CONTROL CIRCUIT 
    1. Disconnect horn relay.
    2. Disconnect IPDM E/R connector.
    3. Check continuity between IPDM E/R harness connector and horn relay harness connector.
      IPDM E/R Horn relay Continuity
      Connector Terminal Connector Terminal
      E6 44 E11 1 Existed
    4. Check continuity between IPDM E/R harness connector and ground.
      IPDM E/R Ground Continuity
      Connector Terminal
      E6 44 Not existed

      Is the inspection result normal? 

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

      NO: Repair or replace harness.

  4. CHECK VEHICLE SECURITY HORN RELAY CONTROL SIGNAL 
    1. Turn power switch ON.
    2. Select "VEHICLE SECURITY HORN" in "ACTIVE TEST" mode of "THEFT ALM" of "BCM" using CONSULT.
    3. Check voltage between IPDM E/R harness connector and ground under the following conditions.
      (+) (-) Condition Voltage (V) (Approx.)
      IPDM E/R VEHICLE SECURITY HORN
      Connector Terminal
      E6 45 Ground ON 0
      OFF Battery voltage

      Is the operation normal? 

      YES: GO TO  8.

      NO: GO TO 5.

  5. CHECK VEHICLE SECURITY HORN RELAY POWER SUPPLY 
    1. Disconnect vehicle security horn relay.
    2. Check voltage between vehicle security horn relay harness connector and ground.
      (+) (-) Voltage (V) (Approx.)
      Vehicle security horn relay
      Connector Terminal
      M141 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO 6.

      NO-1: Check 10 A fuse [No. 38 located in the fuse block (J/B)].

      NO-2: Check harness for open or short between vehicle security horn relay and fuse.

  6. CHECK VEHICLE SECURITY HORN CONTROL CIRCUIT 
    1. Disconnect IPDM E/R connector.
    2. Check continuity between IPDM E/R harness connector and vehicle security horn relay harness connector.
      IPDM E/R Vehicle security horn relay Continuity
      Connector Terminal Connector Terminal
      E6 45 M141 3 Existed
    3. Check continuity between IPDM E/R harness connector and ground.
      IPDM E/R Ground Continuity
      Connector Terminal
      E6 45 Not existed

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace harness.

  7. CHECK VEHICLE SECURITY HORN RELAY 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

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

    NO: Replace vehicle security horn relay.

  8. CHECK VEHICLE SECURITY HORN CIRCUIT 
    1. Disconnect vehicle security horn relay.
    2. Disconnect vehicle security horn connector.
    3. Check continuity between vehicle security horn relay harness connector and vehicle security horn harness connector.
      Vehicle security horn relay Vehicle security horn Continuity
      Connector Terminal Connector Terminal
      M141 2 E61 1 Existed
    4. Check continuity between vehicle security horn relay harness connector and ground.
      Vehicle security horn relay Ground Continuity
      Connector Terminal
      M141 2 Not existed
    5. Check continuity between vehicle security horn harness connector and ground.
      Vehicle security horn Ground Continuity
      Connector Terminal
      E62 2 Existed

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Repair or replace harness.

  9. CHECK VEHICLE SECURITY HORN RELAY 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Replace vehicle security horn.

    NO: Replace vehicle security horn relay.

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