TSRM/MK3 Supra/Repair Manual
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BE/Body Electrical System — Inspection of Ignition Switch Circuit., page 89

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Inspection of Ignition Switch Circuit. — MK3 Supra Body Electrical System, page 89
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Page text (OCR transcript)
B    INSPECTION OF IGNITION SWITCH CIRCUIT.

Turn ignition switch to
ON or ACC position.

Is CIG fuse normal?

No → Replace fuse.
         Is operation
         normal?

                    No → Short circuit in wire
                           harness between fuse and
                           terminal 4 of computer.

                    Yes ↓

         Yes → Fuse faulty.

COMPUTER

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

INSPECT IGNITION SWITCH CIRCUIT
Is there battery voltage between terminal 4 and
ground with ignition switch turned to ON or
ACC.

No → Open circuit in wire harness between fuse
      and terminal 4 of computer.

Yes ↓

Replace computer.