B2875
DTC B2850, B2855, B2870, or B2875
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)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* A current DTC will clear when the failed switch input is no longer active.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.
Reference Information
Schematic Reference
Tilt/Telescoping Steering Column Schematics (Tilt/Telescoping Steering Column Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Steering Wheel and Column Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
Ignition ON, view the appropriate scan tool Tilt or Telescope Switch parameter while cycling the appropriate switch between states.The parameter should change between Active and Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the tilt/telescope switch.
2. Ignition ON, verify a test lamp illuminates between terminal 4 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Verify with the scan tool that the appropriate switch parameter is Inactive.
• If not the specified value, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Install a 3A fused jumper wire between the appropriate circuit terminal 1, 2, 3, or 5 and terminal 4. Verify with the scan tool that the appropriate switch parameter is Active.
• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
5. If all circuit test normal, test or replace the tilt/telescope switch.
Component Testing
Tilt/Telescope Switch
1. Ignition OFF, disconnect the harness connector at the tilt/telescope switch.
2. Test for infinite resistance between terminals 1, 2, 3, and 5 with the switch in the neutral position:
• If less than the specified range, replace the tilt/telescope switch.
3. Test for less than 1 ohm between terminal 4 and terminals 1, 2, 3, and 5 with the switch in each appropriate position.
• If greater than the specified value, replace the tilt/telescope switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Column Replacement (Steering Column Replacement)
* Control Module References (Programming and Relearning)for MSM replacement, setup, and programming