2010 Cadillac CTS Sedan AWD V6-3.6L Page 533
DTC B2850, B2855, B2870, or B2875
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category
DTC Descriptor
DTC B2850 01
- Telescope Forward Switch Circuit Short to Battery
DTC B2855 01
- Telescope Rearward Switch Circuit Short to Battery
DTC B2870 01
- Tilt Up Switch Circuit Short to Battery
DTC B2875 01
- Tilt Down Switch Circuit Short to Battery
Diagnostic Fault Information
Circuit Description
The memory seat module (MSM) receives voltage inputs from the tilt/telescope switch based on the position of the switch. The MSM then supplies
battery voltage and a ground to the tilt or telescope motor control circuits depending on which direction of movement is requested.
Conditions for Running the DTC
The ignition ON.
Conditions for Setting the DTC
The MSM detects a tilt or telescope switch input for more than 30 consecutive seconds after the tilt or telescope motor movement has stopped.
Action Taken When the DTC Sets
* The tilt or telescope motor 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* A current DTC will clear when the failed switch input is no longer active.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 tilt or telescope switch may cause a DTC to set.
