Chart B-8, Power Loss From Cps To Other Components

You are at this chart because odometer, with key on, read all 8's, was blank, high beams would not cycle, courtesy lights would not turn on, or light on chime would not sound when test was attempted. These symptoms indicate a loss of 12 volts from Central Power Supply (CPS) to other components in system.

1. This checks whether battery voltage is feeding CPS.
2. This checks an open in circuit No. 640, CPS battery feed, poor terminal contact, or a faulty CPS.
3. This checks an intermittent short to ground condition on any of 12-volt circuits from CPS or in circuit No. 640 feed.
4. This checks a short to ground in circuit No. 640.
5. This checks each individual 12-volt circuit from CPS a short to ground, a faulty component, or a faulty CPS.

Fig 1: Chart B-8, Schematic, Power Loss From CPS To Other Components

Fig 2: Flow Chart B-8, Power Loss From CPS To Other Components