TSRM/MK3 Supra/Repair Manual
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BE/Body Electrical System — Inspection of Back Door Key Unlock Switch Circuit., page 91

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p.092
Inspection of Back Door Key Unlock Switch Circuit. — MK3 Supra Body Electrical System, page 91
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Page text (OCR transcript)
D    INSPECTION OF BACK DOOR KEY UNLOCK SWITCH CIRCUIT.

Turn ignition switch off.

COMPUTER

Disconnect computer connector and inspect
connector on wire harness side as follows.

INSPECT BACK DOOR KEY UNLOCK
SWITCH CIRCUIT
Is there continuity between terminal 10 and
ground with key position is normal?

Yes → Short circuit in back door key unlock
switch circuit.

No ↓

Is there continuity between terminal 10 and
ground with back door unlocked with key?

No → Open circuit in back door key unlock
switch circuit.

Yes ↓

Replace computer.