Check Horn Function

First perform the "SELF-DIAG RESULTS" of "BCM" with CONSULT-III, then perform the trouble diagnosis of malfunction system indicated in "SELF-DIAG RESULTS" of "BCM". Refer to "CAN COMMUNICATION UNIT ".

1. CHECK HORN OPERATION 

   Check if horn sounds with horn switch.

   Does horn operate? 

   Yes: GO TO 2.

   No: Check horn circuit. Refer to "HORN ".

2. CHECK IPDM E/R INPUT SIGNAL 

   Check voltage between IPDM E/R connector and ground.

   TERMINAL VOLTAGE CHART
   
   

   Terminals			Voltage (V) (Approx.)
   (+)		(-)
   IPDM E/R connector	Terminal
   E9	48	Ground	Battery voltage

   OK or NG 

   OK: Replace IPDM E/R.

   NG: GO TO 3.

   Fig 1: Checking Voltage Between IPDM E/R Connector Terminal 48 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
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 connector and horn relay connector.
      TERMINAL CONTINUITY CHART
      
      

      A		B		Continuity
      IPDM E/R connector	Terminal	Horn relay connector	Terminal
      E9	48	E20	1	Yes

   OK or NG 

   OK: Check harness connection.

   NG: Repair or replace harness.

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

   Courtesy of NISSAN MOTOR CO., U.S.A.