B2878
DTC B2853, B2858, B2873, or B2878
Circuit Description
The memory seat module (MSM) receives ground inputs from contacts inside the tilt/telescoping switch. The MSM then supplies battery voltage to the tilt motor up or down circuit, or the telescope motor in or out circuit depending on which direction of movement is requested. Both motors are reversible and voltage is applied to either circuit to accomplish movement in opposite directions.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
^ DTC 2853 Telescope Forward Switch Circuit High
^ DTC 2858 Telescope Rearward Switch Circuit High
^ DTC 2873 Tilt Up Switch Circuit High
^ DTC 2878 Tilt Down Switch Circuit High
Conditions for Running the DTC
The MSM is ON.
Conditions for Setting the DTC
The MSM detects a switch input for more than 30 consecutive seconds after movement of the motor in the requested direction has stopped.
Action Taken When the DTC Sets
^ The motor that is being driven by the failed switch will be deactivated.
^ Memory recall functions will be disabled.
Conditions for Clearing the DTC
^ A current DTC will clear when the failed switch input is no longer active.
^ A history DTC will clear after 100 ignition cycles.
Diagnostic Aids
An intermittently stuck switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
