LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> RX 350 AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> U151F Automatic Transaxle >> Automatic Transaxle System >> Pattern Select Switch Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 VSC 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 pattern select switch (ECT SNOW switch) connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      4 - Body ground Below 1 Ω
      3. Fig 1: Identifying E4 Pattern Select Switch Connector
      G05268687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    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.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      3 - 4 Press continuously pattern select switch Below 1 Ω
      Release pattern select switch 10 kΩ or higher
      2. Fig 2: Identifying E4 Pattern Select Switch Connector
      G05271815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE NO. 1 PATTERN SELECT SWITCH ASSEMBLY 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (NO. 1 PATTERN SELECT SWITCH ASSEMBLY - BODY ECU) 
    1. Connect the pattern select switch (ECT SNOW switch) connector.
    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 (Multiplex Network Body ECU) Connector
      G05271816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      B5-17 (SNOW) -Body ground Press continuously pattern select switch 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  

scientia non olet · About LEMON Manuals