Inspection Procedure

HINT:

Start the engine before inspection. Check the IG1 NO 1 relay or battery if the starting system does not start.

1. INSPECT FUSE (ECU-IG No. 1, PSB) 
   1. Remove the ECU-IG No. 1 and PSB fuses from the cowl side junction block LH.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      ECU-IG No. 1 fuse	Always	Below 1 Ω
      PSB fuse

   NG: REPLACE FUSE 

   OK: Go to next Step 

2. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND) 
   1. Disconnect the E41 and E42 seat belt control ECU connectors.
   2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Switch Condition	Specified Condition
      E42-8 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V
      	Engine switch off	Below 1 V
      E41-7 (+B) - Body ground	Always	11 to 14 V

   3. Measure the resistance according to the value (s) in the table below.
      Fig 1: Identifying E41 And E42 Seat Belt Control ECU Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      E41-8 (PGND) - Body ground	Always	Below 1 Ω

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE SEAT BELT CONTROL ECU  (See REMOVAL  )