The mobility seat module uses inputs from 4 limit switches in order to determine the seat position. The limit switch signal circuits are referenced from battery voltage within the module. The limit switches will open or close the switch signal circuits to ground in order for the module to determine them to be active or inactive. The lift lower limit switch signal circuit is considered to be active when the circuit reference voltage is low or closed to ground by the switch.

This diagnostic procedure supports the following DTC:

DTC 052 Lift Lower Limit Switch Remains Active After Start of Ascend

After seat ascend operation has been in progress for 1 second from the out of vehicle position the lift lower limit switch signal to the module remains low or active.

While the fault is current the module will allow the seat to be ascended to the in vehicle outward facing position and not allow the seat to descend to the out of vehicle position.

The DTC may be cleared by removing the main power supply or ground from the seat module.

Inspect the limit switch for any physical damage or obstructions to its mechanical operation which may cause the condition.