Inspection Procedure

HINT

When the power switch is OFF, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU.

With the power switch OFF, open the driver door Then (with the power switch still OFF) open and close any door several times at 1.5 second intervals

1. CHECK DTC OUTPUT (B2785) 
   1. Check the DTCs.

      OK: DTC B2782 is output, but DTC B2785 is not output. 

   NG: GO TO LIN COMMUNICATION SYSTEM (B2785)  (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN )

   OK: Go to Next Step 

2. INSPECT STEERING LOCK ECU 
   1. Measure the voltage according to the value(s) in the table below

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      L33-3 (IGE) - L33-1 (GND)	Power switch ON (IG) Steering lock motor is operating	Below 1 V
      L33-3 (IGE) - L33-1 (GND)	Power switch ON (IG) Steering lock motor is not operating	11 to 14 V

      HINT:

      When the steering lock is activated and the power switch is turned ON (IG), the steering lock motor activates to release the steering lock. The motor operation occurs for 2 to 15 seconds.

      Fig 1: Inspecting Steering Lock ECU

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 3 

   OK: REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)  (See DISASSEMBLY  )

3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU AND BODY GROUND) 
   Fig 2: Checking Harness And Connector (Steering Lock ECU - Main Body ECU And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the L33 steering lock ECU connector.
   2. Disconnect the L13 main body ECU connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      L33-3 (IGE) - L13-19 (SLR+)	Always	Below 1 Ω
      L33-1 (GND) - Body ground	Always	Below 1 Ω
      L33-3 (IGE) or L13-19 (SLR+) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE MAIN BODY ECU