Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pattern Select Switch Snow Mode Circuit: Procedure
- DRIVING TEST
- Start the engine.
- Turn the ECT SNOW switch "OFF" (Normal drive mode).
- Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.
- Turn the ECT SNOW switch "ON" and perform the same check as above.
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.
OK
There is a difference in acceleration between "ON" and "OFF".
NG → See step 2
OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE
- CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND)
- Disconnect the connector of pattern select switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Specified Condition 3 - Body ground Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- INSPECT PATTERN SELECT SWITCH ASSEMBLY
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Switch Condition Tester Connection Specified Condition Press continuously Pattern select switch
(SNOW)1 - 3 Below 1 Ω Release Pattern select switch
(SNOW)↑ 10 kΩ or higher
NG → REPLACE PATTERN SELECT SWITCH ASSEMBLY
OK: Go to next step
- Measure the resistance according to the value(s) in the table below.
- CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - MAIN BODY ECU)
- Connect the connector of pattern select switch.
- Disconnect the cowl side junction block (main body ECU RH) connector.
- Measure the resistance between terminal SNOW of the cowl side junction block (main body ECU RH) and body ground.
Standard resistance
Switch Condition Tester Connection Specified Condition Press continuously Pattern select switch
(SNOW)J75-17 (SNOW) - Body ground Below 1 Ω Release Pattern select switch
(SNOW)↑ 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE
- Connect the connector of pattern select switch.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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