Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

The S64 Front Seat Adjuster Switch supplies the S65 Front Seat Lumbar Support Switch with a signal and low reference circuits. When a lumbar support switch is pressed, the signal circuit from the S64 Front Seat Adjuster Switch is pulled low through the switch contacts and series of resistors indicating the lumbar support request. In response to this request, the S64 Front Seat Adjuster Switch sends a LIN serial data message to the K40 Seat Adjuster Memory Module indicating the requested lumbar, bolster, or massage request. The K40 Seat Adjuster Memory Module then sends a LIN serial data message to the K134 Front Seat Bolster Memory Module commanding it to perform the required pneumatic movements.

The K134 Seat Bolster Memory Module contains the electronic circuitry for executing the commanded pneumatic seat adjustments, air direction solenoids, pressure sensors for storing air bladder pressures, and outputs which supplies battery power and a low side drive pulse width modulated (PWM) signal to the external seat air pump motor when any of the air bladders require inflating.