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Home >> Toyota >> 2007 >> Highlander Limited, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - U151F >> Automatic Transaxle System >> Pattern Select Switch Circuit >> Inspection Procedure

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 (PATTERN SELECT SWITCH ASSEMBLY NO.1 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.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      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 (ECT SNOW Switch)
    G05239767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

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

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Switch Condition Tester Connection Specified Condition
      Press continuously Pattern select switch 3-4 Below 1 Ω
      Release Pattern select switch ↑ 10 kΩ or higher
      Fig 2: Identifying Pattern Select Switch Assembly No.1 Connector Terminals
      G05239768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY NO.1 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY NO.1 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 Pattern Select Switch Assembly No.1 Connector Terminals
      G05239769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Switch Condition Tester Connection Specified Condition
      Press continuously Pattern select switch B9-15 (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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