Inspection Procedure

1. Delete the DTCs (See DTC CHECK / CLEAR ).
2. Check for DTC B2289 and B2785.

   Result 

   RESULT REFERENCE
   
   

   Display (DTC output)	Proceed to
   "DTC B2289" only	A
   "DTC B2785" only	B
   No DTC	C

   HINT:

   If DTC B2785 is output, perform troubleshooting for DTC B2785 first (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).

   B:  Go to DTC B2785

   C: CHECK INTERMITTENT PROBLEMS 

   A: Go to Next Step 

1. Disconnect the E58 and IR ECU connectors.
   Fig 1: Identifying Wire Harness (Main Body ECU - Certification ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   IR-9 (LIN1) - E58-10 (LIN)	Always	Below 1 Ω
   IR-9 (LIN1) or E58-10 (LIN) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

1. After replacing the main body ECU with a normally functioning ECU, check that the power source mode to change on (READY).

   OK: 

   Power switch on (READY). 

   HINT:

   If power mode change to on (READY), refer to problem symptoms table of the smart key system (entry) (matching for the inside of the cabin cannot be performed) (See PROBLEM SYMPTOMS TABLE ).

NG:  Go to SMART KEY SYSTEM  (ENTRY)

OK: END (MAIN BODY ECU DEFECTIVE)