Acceleration/Deceleration Sensor: Description and Operation

The Controller monitors the acceleration switch at all times. The switch assembly contains three mercury switches that monitor vehicle deceleration rates (G force). Sudden, rapid changes in vehicle and wheel deceleration rate trigger the switch, sending a signal to the CAB. The switch assembly provides three deceleration rates; two for forward braking and one for rearward braking.

During four-wheel drive operation, the acceleration switch provides deceleration data to the ABS control module.

Circuits B21, B22 and B23 connect the acceleration sensor to the ABS control module. Circuits B21 and B22 provide switch states while circuit B23 provides ground. At the ABS control module circuit B21 connects to cavity 25, circuit B22 connects to cavity 43 and circuit B23 connects to cavity 26.