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Test No. 2

  1. Remove key from ignition switch. Open any door. Disconnect CPU 20-pin connector. SeeFigure . Ground terminal 2M (Red/Green wire) of CPU 20-pin connector. If security light comes on, replace CPU.
  2. If security light does not come on, check voltage at terminal 1I (Blue/Red wire) (1B (Blue Red Wire on 1992 models)) of instrument cluster harness connector No. 1 (White, 14-pin connector). SeeFigure . If battery voltage is present, repair wiring between ROOM fuse and instrument cluster.
  3. Measure voltage at terminal 1H (Red/Green wire) (1J (Red/Green wire on 1992 models)) of instrument cluster connector No. 1. If battery voltage is present, repair wiring between instrument cluster and CPU. If battery voltage is not present, replace security light.
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