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  1. Turn ignition off. Check stop light fuse. If fuse is blown, replace fuse and check operation of stop light switch circuit. If operation is not normal, check for short between terminal No. 16 of computer or terminal No. 1 of stop light switch and fuse.
  2. Disconnect stop light switch connector, check for continuity between terminal No. 3 (terminal No. 2 on Corolla, MR2 and Supra) of connector and body ground. If no continuity is present, check for open between terminal No. 3 and body ground. Test body ground circuit.
  3. If continuity is present, check stop light switch operation. If stop light switch is not operating properly, replace switch. If switch is operating properly, reconnect stop light switch connector.
  4. Disconnect computer connector, check for battery voltage between terminal No. 16 and body ground with brake pedal released. If no battery voltage is present, check for open between terminal No. 16 of computer and stop light fuse.
  5. If battery voltage is present, check for battery voltage between terminal No. 15 and ground with brake pedal depressed. If no battery voltage is present, check for open between terminal No. 3 (terminal No. 2 on Corolla, MR2 and Supra) of stop light switch. If battery voltage is present, replace cruise control computer.
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