Chart B8 - Power Loss From Cps To Other Components

Fig 1: Chart B8, Power Loss From CPS to Other Components Schematic

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

Fig 2: Flow Chart B8, Power Loss From CPS to Other Components

Fig 3: Flow Chart B8, Power Loss From CPS to Other Components