5 - 112 ANTI-LOCK 6 BRAKE SYSTEM

²System relay voltage.

²Ground.

²Pump/Motor Relay Monitor

²Diagnostics Communications

CONTROLLER ANTI-LOCK BRAKE (OUTPUTS)

²6 modulator valves, 4 Build/Decay and 2 isolation valves.

²Anti-Lock warning lamp.

²System relay actuation.

²Diagnostic communication.

²Pump motor relay actuation

DIAGNOSTIC CONNECTOR

On the AA, AG and AJ bodies, the Bendix Anti-Lock System diagnostic connector is located under the fuse panel access cover. The access cover is located on the lower section of the instrument panel on the left side of the steering column. The diagnostics connector is a blue 6 way connector see (Fig. 8).

Fig. 8 A.B.S. Diagnostic Connector Location

ANTI-LOCK SYSTEM RELAYS AND WARNING LAMPS

SYSTEM RELAY

The (ABS) Modulator Valves and Anti-Lock Warning Lamp Relay. Are powered through a System Relay located on a bracket mounted to the (CAB) see (Fig. 9) for location of the relay. The System Relay provides power to the (CAB) for modulator valve operation (pins 47 and 41) after the startup cycle when the ignition is turned on.

ANTI-LOCK WARNING LAMP RELAY

The Amber Anti-Lock Warning Lamp is controlled by the Anti-Lock Warning Lamp relay The relay is

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mounted to the same bracket as the system relay at the (CAB) see (Fig. 9). With the relay de-energized, the lamp is lit. When the System Relay is energized by the (CAB), the Anti-Lock warning lamp relay is energized, and the lamp is turned off. Thus, the lamp will be lit if the (CAB) is disconnected or if a system fault causes the (ABS) function to be turned off.

Fig. 9 System Relay/Warning Lamp Relay

PUMP/MOTOR RELAY

Pump/Motor power is supplied by the Pump/Motor Relay. The Pump/Motor Relay is either mounted on the left front inner fender shield, or the front of the left shock tower. The mounting location is dependent on whether the vehicle is or is not equipped with a power distribution center. See (Figs. 10 and 11) for specific mounting locations.

ANTI-LOCK WARNING LAMP OFF

System Relay and Anti-Lock Warning Lamp Relay Energized

From pin 57 the (CAB) energizes the system relay coil. The electrical current flow in the coil closes the system relay, electrical current is then provided to pins 47 and 41 of the (CAB) to provide power to the modulator valves. This electrical current also energizes the Amber Anti-Lock Warning Lamp Relay coil.The current flow in the Anti-Lock Warning Lamp Relay opens the Anti-Lock Warning Lamp Relay switch. This breaks the ground path to the Amber Anti-Lock Warning Lamp and the light is turned off.