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Inspection Procedure

  1. DRIVING TEST 
    1. Start the engine.
    2. Turn the ECT SNOW switch "OFF" (Normal drive mode).
    3. Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal (*1).
    4. Turn the ECT SNOW switch "ON" and perform the same check as (*1).

      Confirm that there is a difference between ECT SNOW switch "ON" and "OFF".

      HINT:

      • Driving test should be done on a paved road (a nonskid road).
      • Make sure not to use the TRAC system when testing a vehicle equipped with one.

      Standard: There is a difference in acceleration between "ON" and "OFF". 

    NG: Go to step 2 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. CHECK HARNESS AND CONNECTOR (NO.1 PATTERN SELECT SWITCH ASSEMBLY BODY GROUND) 
    1. Disconnect the connector of pattern select switch (ECT SNOW switch).
    2. Measure the resistance according to the value (s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      4 - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Pattern Select Switch Connector Terminals
    G05268687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. INSPECT NO.1 PATTERN SELECT SWITCH ASSEMBLY 
    1. Measure the resistance according to the value (s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATION

      Switch Condition Tester Connection Specified Condition
      Press continuously Pattern select switch 3-4 Below 1 Ω
      Release Pattern select switch 10 kΩ or higher

    NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY NO.1 

    Fig 2: Identifying Pattern Select Switch Connector Terminals
    G05268688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (NO.1 PATTERN SELECT SWITCH ASSEMBLY - MULTIPLEX NETWORK BODY) 
    1. Connect the connector of pattern select switch (ECT SNOW switch).
    2. Disconnect the instrument panel junction block assembly (multiplex network body ECU) connector.
    3. Measure the resistance between terminals SNOW of instrument panel junction block assembly (multiplex network body ECU) and body ground.
      Fig 3: Identifying Instrument Panel Junction Block Assembly Connector Terminals
      G05268689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Resistance 

      RESISTANCE SPECIFICATION

      Switch Condition Tester Connection Specified Condition
      Press continuously Pattern select switch B5 -17 (SNOW) - Body ground Below 1 Ω
      Release Pattern select switch 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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