TSRM/MK3 Supra/Repair Manual
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BE/Body Electrical System — Light Retractor Control System, page 23

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Light Retractor Control System — MK3 Supra Body Electrical System, page 23
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Page text (OCR transcript)
Light Retractor Control System

1. INSPECT LIGHT RETRACTOR CONTROL RELAY
(Relay Operation)
(a) Turn the light control switch off.
(b) With connector connected, ground the terminal 14.
(c) Check that the headlights rise with the light lit.

(d) Quickly ground terminal 3. The light will go out, but the headlight should remain up.

(e) When terminal 3 is taken off ground, the headlights should flip down.
If operation is not as specified, replace the relay.

(Relay Circuit)
Disconnect the relay and inspect the connector on the wire harness side as shown in the chart below.
HINT: This circuit includes the diode, if the circuit shows no continuity change the positive and negative probes and recheck the circuit.

Wire Harness Side

Check For | Tester Connection | Condition | Specified Value
Voltage | 8 - Ground | — | Battery voltage
Continuity | 18 - Ground | — | Continuity
 | 4 - Ground | Ignition switch position | LOCK or ACC | No voltage
 | | | ON | Battery voltage
Voltage | 2 - Ground | — | Battery voltage
 | 10 - Ground | — | Battery voltage
 | 15 - Ground | Door position | Closed (Courtesy switch OFF) | Battery voltage
 | | | Opened (Courtesy switch ON) | No voltage