Gear Selector Module (GSM)

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Fig 1: Gear Selector Module

Courtesy of VOLVO CARS CORPORATION

The gear selector assembly is in the tunnel console. It is mechanically connected to the gearbox by a cable which moves the gear valve in the gearbox control system. The gear selector module (GSM) is positioned on the top panel of the gear selector assembly. The gear selector module (GSM) uses serial communication to communicate with the transmission control module (TCM) to light the gear position indicator. The indication occurs via LEDs in the top panel.

The gear selector control module (GSM) communicates with the central electronic module (CEM) to activate the shift-lock. The shift-lock solenoid power supply and ground is directly connected to the gear selector module (GSM).

The "W" switch in the gear selector assembly top panel is positioned on the printed circuit board for the gear selector module (GSM) and activates Winter mode.

There are diagnostics for the gear selector module (GSM). Diagnostic trouble codes (DTCs) are stored in the transmission control module (TCM) in the event of a fault.