TSRM/MK2 Supra/Repair Manual
Repair ManualWiring Diagrams
p.091

BE/Body Electrical System, page 92

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p.093
Body Electrical System — MK2 Supra Body Electrical System, page 92
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INSPECT LH DOOR LOCK SOLENOID CIRCUIT
Disconnect connector from computer.
Is there continuity between terminal 1 of wire harness side connector and body ground with LH door unlocked?

No → Open circuit in wire harness between terminal 1 of computer and terminal 2 of door lock solenoid.

Yes ↓

INSPECT RH DOOR LOCK SOLENOID CIRCUIT
Disconnect connector from computer.
Is there continuity between terminal 2 of wire harness side connector and body ground with RH door unlocked?

No → Open circuit in wire harness between terminal 2 of computer and terminal 2 of door lock solenoid.

Yes ↓

INSPECT LH DOOR LOCK SWITCH CIRCUIT
Close LH Door.
Is there continuity between terminal 6 and body ground with LH door closed?

Yes → Short circuit in wire harness between terminal 6 of computer and terminal 2 of LH door lock switch.

No ↓

INSPECT RH DOOR LOCK SWITCH CIRCUIT
Close RH door.
Is there continuity between terminal 6 and body ground with RH door closed?

Yes → Short circuit in wire harness between terminal 6 of computer and terminal 2 of RH door lock switch.

No ↓

INSPECT HORN, TAILLIGHT AND HEAD-LIGHT CIRCUIT
Is there battery voltage between terminal 12 and body ground.

No → Open circuit in wire harness between terminal 12 of computer and horn or taillight control relay or headlight control relay.

Yes ↓

Replace computer.