Horn Function Check

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

1. CHECK HORN FUNCTION 

   Does horn sound with horn switch?

   OK or NG 

   OK: GO TO 2.

   NG: Check horn circuit. Refer to "HORN ".

2. CHECK IPDM E/R INPUT SIGNAL 

   Check voltage between IPDM E/R connector and ground.

   CONNECTOR TERMINAL VOLTAGE SPECIFICATION
   
   

   Terminals			Voltage (V) (Approx.)
   (+)		(-)
   IPDM E/R connector	Terminal
   E43	13	Ground	Battery voltage

   OK or NG 

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

   NG: GO TO 3.

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

   
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.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION
      
      

      A		B		Continuity
      IPDM E/R connector	Terminal	Horn relay connector	Terminal
      E43	13	H-1	1	Yes

   4. Check continuity between IPDM E/R harness connector and ground.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION
      
      

      A		Ground	Continuity
      IPDM E/R connector	Terminal
      E43	13		No

   OK or NG 

   OK: Check condition of harness and connector.

   NG: Repair or replace harness.

   Fig 2: Checking Continuity Between IPDM E/R Harness Connector And Ground