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.
Section 1014 (Seat Heater System): Inspection
- INSPECT SEAT HEATER SWITCH CONTINUITY SWITCH POSITION AND SPECIFIED CONDITION
Switch position Tester connection Specified condition ON 2-3-6 Continuity OFF - No continuity Illumination circuit 1-4 Continuity If continuity is not as specified, replace the switch.
- INSPECT SEAT HEATER INDICATOR LIGHT OPERATION
- Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 2.
- Push the seat heater switch ON that the indicator light lights up.
If operation is not as specified, replace the switch and inspect the circuits connected to other parts.
- INSPECT SEAT HEATER CUSHION REAR SIDE CONTINUITY
- Heat the thermostat with a light.
- Inspect the seat heater cushion continuity between terminals, as shown in Fig 3 .
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TESTER CONNECTION AND SPECIFIED CONDITIONTester connection Condition Specified condition A1-B2 Seat heater temperature below 25°C (77°F) Continuity A1-B2 Seat heater temperature above 45°C (113°F) No continuity A2-B1 Always Continuity A2-C1 Always Continuity B2-C2 Always Continuity If continuity is not as specified, replace the seat cushion pad.
- INSPECT SEAT HEATER CUSHION CIRCUIT
Disconnect the connector from the seat heater cushion and inspect the connector on wire harness side, as shown in Fig 4 .
TESTER CONNECTION AND SPECIFIED CONDITIONTester connection Condition Specified condition 2 - Body ground Seat heater switch ON Battery Positive Voltage If circuit is not as specified, inspect the wire harness.
- INSPECT SEAT CUSHION FRONT SIDE CONTINUITY
Inspect the seat cushion front side continuity between terminals, as shown in Fig 5 .
TESTER CONNECTION AND SPECIFIED CONDITIONTester connection Condition Specified condition 1-2 Always Continuity If continuity is not as specified, replace the seat cushion pad.
- INSPECT SEAT BACK CONTINUITY
Inspect the seat back continuity between terminals, as shown in Fig 6 .
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TESTER CONNECTION AND SPECIFIED CONDITIONTester connection Condition Specified condition 1-2 Always Continuity If continuity is not as specified, replace the seat back pad.
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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.