THEFT DETERRENT SYSTEM, Diagnostic DTC:B2485

DESCRIPTION

This DTC is output when one of the following occurs: 1) security horn is malfunctioning; 2) front light ECU (front controller) is malfunctioning; or 3) the wire harness between the front light ECU and security horn is open or shorted.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY HORN)

   
   

   1. Operate the intelligent tester according to the steps on the display and select "Active Test".

      
      

      1. Intelligent tester

         Body No. 5

         Tester Display	Test Part	Control Range
         Security Horn	Security horn	ON / OFF

         OK
         Security horn operates normally.

   
   

   NG

   INSPECT SECURITY HORN ASSEMBLY Click here

   OK

   REPLACE FRONT LIGHT ECU

2. INSPECT SECURITY HORN ASSEMBLY

   
   

   1. 

      for LHD:

      
      

      1. Remove the security horn Click here.

      2. Check operation of the horn.

         OK
         Measurement Condition Specified Condition Battery positive (+) → Terminal 1 Battery negative (-) → Horn bracket Horn sounds

   2. 

      for RHD:

      
      

      1. Remove the security horn Click here.

      2. Check operation of the horn.

         OK
         Measurement Condition Specified Condition Battery positive (+) → Terminal 1 Battery negative (-) → Horn bracket Horn sounds

   
   

   NG

   REPLACE SECURITY HORN ASSEMBLY

   OK

3. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - SECURITY HORN)

   
   

   1. 

      Disconnect the A52 ECU connector.

   2. Disconnect the A29 horn connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition A52-4 (SH-) - A29-1 Always Below 1 Ω A52-4 (SH-) or A29-1 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE FRONT LIGHT ECU