Circuit/System Description

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The driver shift request, also known as the TAP Up/Downshift manual shift function, allows the driver to select the desired range of gears for current driving conditions. The driver shift request shift system is activated when the gear selector is in the manual position. The driver shift request system is deactivated in all other range positions. When driver shift request is selected, a signal is sent to the Body Control Module and the also to the Transmission Control Module. Each time a signal is sent, an internal counter in the Body Control Module and Transmission Control Module increments. Both counters must have the same value. This code sets when the rolling count value of the Transmission Control Module does not match the same rolling count value sent from the Body Control Module.