Circuit Operation

CIRCUIT OPERATION

Circuit F87 provides power for the ABS warning lamp at the instrument cluster.

Ground for the ABS warning lamp is provided by either the Controller, Anti-Lock Brakes (CAB) or by the ABS main relay when the relay is not energized. The CAB illuminates the lamp by providing ground on circuit B205.

Circuit B205 splices to connect to circuit B235 through a diode. When the ABS main relay is not energized, it connects circuit B235 to circuit Z12.
The ground path for the warning lamp is through the diode to circuit B235, through the ABS main relay to ground on circuit Z12.

The diode between circuit B205 and B235 prevents voltage from flowing to the CAB when the ABS main relay switches to supply power on circuit B235.