Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK HORN FUNCTION

   Check horn function with horn switch.

   Does the horn sound? 

   YES: GO TO 2.

   NO: Refer to "WIRING DIAGRAM ".

2. CHECK HORN RELAY POWER SUPPLY
   1. Turn ignition switch ON.
   2. Perform "ACTIVE TEST", "HORN" with CONSULT.
   3. Using an oscilloscope or analog voltmeter, check voltage between IPDM E/R connector E122 terminal 45 and ground.

   IPDM E/R		Ground	Test item		Voltage (V) (Approx.)
   Connector	Terminal
   E122	45	Ground	HORN	OFF → ON → OFF	Battery voltage → 0 → Battery voltage
   				Other than above	Battery voltage

   Fig 1: Checking Voltage Between IPDM E/R Connector E122 Terminal 45 And Ground

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: Refer to "INTERMITTENT INCIDENT ".

   NO: GO TO 3

3. CHECK HORN RELAY CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect IPDM E/R and horn relay 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
      A: E122	45	B: H-1	1	Yes

   4. Check continuity between IPDM E/R harness connector and ground.

   IPDM E/R		Ground	Continuity
   Connector	Terminal
   E122	45	Ground	No

   Fig 2: Checking Continuity Between IPDM E/R Harness Connector And Horn Relay Harness Connector Terminal

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: GO TO 4

   NO: Repair or replace harness.

4. CHECK INTERMITTENT INCIDENT

   Refer to "INTERMITTENT INCIDENT ".

   Is the inspection result normal? 

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

   NO: Repair or replace the malfunctioning part.