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.
4. Turn the ECT SNOW switch "ON" and perform the same check as (c).

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

• 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.

OK: 

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.
2. Measure the resistance according to the value(s) in the table below.
Fig 1: Identifying Pattern Select Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
Fig 2: Inspecting Pattern Select Switch Assy No. 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

Fig 3: Pattern Select Switch Reference Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE PATTERN SELECT SWITCH ASSY NO. 1 

OK: Go to next step 

1. Connect the connector of pattern select switch.
2. Disconnect the passenger side junction block assy (multiplex network body ECU) connector.
3. Measure the resistance between terminal SNOW of passenger side junction block assy (multiplex network body ECU) and body ground.

Standard: 

Fig 4: Pattern Select Switch Reference Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Identifying Passenger Side Junction Block Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

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