## Multiplex Control System

#### Multiplex Control Unit Input Test (cont'd)

22-279

Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
X8 | WHT/BLK | Under all conditions | Attach to ground: The ignition key light should come on. |

- Blown No. 3 (7.5A) fuse in the under-hood fuse/relay box
- Blown LED
- An open in the wire

O7 | GRN/RED | Ceiling light, spotlights switches in the middle position | Attach to ground: The ceiling light, spotlights should come on. |

- Blown No. 3 (7.5A) fuse in the under-hood fuse/relay box
- Faulty ceiling light or spotlights
- An open in the wire

C11 | BLU | Under all conditions | Attach to ground: Dash lights should come on. |

- Blown No. 2 (15A) fuse in the under-hood fuse/relay box
- Faulty taillight relay
- An open in the wire

F8 | GRN/RED | Brake fluid reservoir float in down position | Check for voltage to ground: There should be battery voltage. |

- Faulty brake fluid level switch
- An open in the wire

E10 | YEL | Under all conditions | Check for voltage to ground: there should be 3 - 8 volts in the sleep mode and battery voltage when awake. |

- An open or short in the wire

K10 | WHT/GRN | Under all conditions | Check for voltage to ground: There should be 3 - 8 volts in the sleep mode and battery voltage when awake. |

- An open or short in the wire