Inspection Procedure

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 

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 

Fig 1: Identifying Pattern Select Switch Connector Terminals

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

Resistance 

Fig 2: Identifying Pattern Select Switch Connector Terminals - Switch Side

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NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY NO. 1 

OK: Go to next step 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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