B4000 DS Cab Plus 4 2WD V6-4.0L SOHC (2002)
Acceleration/Deceleration Sensor: Description and Operation
G-Switch
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The G-switch is used on 4x4 vehicles only.
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The G-switch detects and indicates to the 4WABS control module that the vehicle is moving.
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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.