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Home >> Infiniti >> 2013 >> M35h >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Security Control System) >> DTC/Circuit Diagnosis >> Horn Function >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Infiniti M35h. However, it is still accessible from the selected car via links, so may be relevant.
  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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