B3000 DS Regular Cab 2WD V6-3.0L OHV (2002)
Acceleration/Deceleration Sensor: Description and Operation
The G-switch is used on 4x4 vehicles only.
The G-switch detects and indicates to the 4WABS control module that the vehicle is moving.
Without the G-switch, the control module would have no data to compare and would react as if the vehicle were stopped when in fact it is moving.