Circuit/System Description

WARNING: This page is about a different car, the 2015 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The haptic seats, also known as Active Safety Seats, provide a vibration to alert the driver in certain circumstances. There are two motors in the driver's seat cushion. Either the right or left motor can run or both depending on the alert. The K40D Seat Memory Control Module - Driver provides the output voltage for the motors. The K40D Seat Memory Control Module - Driver receives serial data requests from other modules to activate the appropriate seat motors with the number of pulses requested. While the motors are activated, the K40D Seat Memory Control Module - Driver checks for either shorts to voltage or shorts to ground. Due to the nature of the PWM signal, if a motor circuit is open, it may be reported as either a short to voltage or short to ground.