THEFT DETERRENT SYSTEM Horn Circuit

DESCRIPTION

When the theft deterrent system is changed from the armed state to the alarm sounding state, the theft warning ECU assembly turns on the HORN relay, causing the vehicle horn to sound at 0.4 seconds intervals.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HORN ASSEMBLY

   
   

   1. Press the horn switch and check if the horn sounds.

      Result

      Result	Proceed to
      Horn sounds	A
      Horn does not sound	B

   
   

   B

   Go to HORN SYSTEM Click here

   A

2. CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU - NO. 1 INTEGRATION RELAY [HORN RELAY])

   
   

   1. Disconnect the T36*1 or T39*2 theft warning ECU assembly connector.

      
      

      • *1: except 2 Step Unlock Function

      • *2: for 2 Step Unlock Function

   2. Disconnect the 1I driver side junction block assembly connector.

   3. Measure the resistance according to the value in the table below.

      Standard Resistance
      except 2 Step Unlock Function
      Tester Connection Condition Specified Condition T36-11 (HORN) - 1I-7 Always Below 1 Ω T36-11 (HORN) or 1I-7 - Body ground Always 10 kΩ or higher
      for 2 Step Unlock Function
      Tester Connection Condition Specified Condition T39-24 (HORN) - 1I-7 Always Below 1 Ω T39-24 (HORN) or 1I-7 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE THEFT WARNING ECU ASSEMBLY