TSRM/MK4 Supra/Repair Manual
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BE/Body Electrical Systems — Seat Heater Inspection, page 59

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Seat Heater Inspection — MK4 Supra Body Electrical Systems, page 59
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Page text (OCR transcript)
BODY ELECTRICAL SYSTEM – SEAT HEATER SYSTEM
BE–59

Connector "A"
BE1417 e-2-2-A
Connector "B" 209261

SEAT HEATER INSPECTION
1. INSPECT SEAT CUSHION CONTINUITY
(a) Heat the thermostat with a light.
(b) Inspect the seat heater continuity between terminals.

Tester connection to terminal number | Condition | Specified condition
A1–A2 | Constant | Continuity
A1–B2 | Constant | Continuity
A2–B2 | Constant | Continuity
A3–A4 | Seat heater temperature below 25°C(77°F) | Continuity
A4–B1 | Seat heater temperature below 25°C(77°F) | Continuity
A3–A4 | Seat heater temperature above 45°C(113°F) | No Continuity
A4–B1 | Seat heater temperature above 45°C(113°F) | No Continuity

If continuity is not as specified, replace the seat cushion pad.

Seat Back Side
e-4-1
209052

2. INSPECT SEAT BACK CONTINUITY
Inspect the seat heater continuity between terminals, as shown.

Tester connection to terminal number | Condition | Specified condition
1–3 | Constant | Continuity
2–4 | Constant | Continuity

If continuity is not as specified, replace the seat back pad.