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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSECURITY CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS)DTC/CIRCUIT DIAGNOSISHORN FUNCTIONDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION 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 
    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 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

      E18

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  5. CHECK HORN CONTROL CIRCUIT 2 
    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

      Theft warning horn relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E6

      45

      E18

      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

    Replace IPDM E/R. Refer to Removal and Installation .

    NO

    Repair or replace harness.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.