TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
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BE/Body Electrical Systems27 / 203
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TROUBLESHOOTING — MK4 Supra Body Electrical Systems, page 27
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TROUBLESHOOTING The table below will be useful for you in troubleshooting these electrical problems. The most likely causes of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and replace the part when it is found to be faulty. Trouble | Parts name | (See page) Only one light does not light up. 1. Bulb 2. Wire Harness Interior light does not light up (All). 1. DOME Fuse | (BE–5) 2. Integration Relay | (BE–29) 3. Wire Harness "Illuminated Entry System" does not operate. 1. Integration Relay | (BE–29) 2. Door Courtesy Switch | (BE–28) 3. Door Key Lock and Unlock Switch | (BE–158) 4. Door Unlock Detection Switch | (BE–145) 5. Wire Harness Front personal light does not light up. 1. Bulb 2. Front Personal Light | (BE–27) 3. Wire Harness Luggage room light does not light up. 1. Bulb 2. Luggage Room Light Switch | (BE–28) PERSONAL LIGHT SWITCH INSPECTION 1. INSPECT INTERIOR LIGHT CONTINUITY Switch position | Tester connection to terminal number | Specified condition DOOR | 1–3 | Continuity OFF | – | No continuity 2. INSPECT PERSONAL LIGHT CONTINUITY Switch position | Tester connection to terminal number | Specified condition OFF | – | No continuity *ON | 1–2 | Continuity * Set the interior light switch to OFF or DOOR. If continuity is not as specified, replace the light assembly or bulb.