B2855
DTC B2855
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 B2855 01
- Telescope Rearward 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 telescope rearward switch input for more than 30 consecutive seconds after rearward movement of the motor has stopped.
Action Taken When the DTC Sets
* The 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* A current DTC will clear when the failed switch input is no longer active.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 telescope switch may cause this 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
Programming and Relearning (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
Ignition ON, view the scan tool Telescope Rearward Switch parameter while cycling the tilt/telescope switch between the neutral and TELESCOPE OUT position. 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 the B+ circuit 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 the scan tool Telescope Rearward Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.
4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the B+ circuit terminal 4. Verify the scan tool Telescope Rearward 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 the following terminals with the switch in the neutral position:
* B+ terminal 4 and signal terminal 5
* B+ terminal 4 and signal terminal 1
* B+ terminal 4 and signal terminal 2
* B+ terminal 4 and signal terminal 3
• If less than the specified range, replace the tilt/telescope switch.
3. Test for less than 1 ohm between the B+ terminal 4 and the signal terminal 5 with the switch in the TILT UP position.
• If greater than the specified range, replace the tilt/telescope switch.
4. Test for less than 1 ohm between the B+ terminal 4 and the signal terminal 1 with the switch in the TILT DOWN position.
• If greater than the specified range, replace the tilt/telescope switch.
5. Test for less than 1 ohm between the B+ terminal 4 and the signal terminal 2 with the switch in the TELESCOPE OUT position.
• If greater than the specified range, replace the tilt/telescope switch.
6. Test for less than 1 ohm between the B+ terminal 4 and the signal terminal 3 with the switch in the TELESCOPE IN position.
• If greater than the specified range, 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)
* Programming and Relearning (Programming and Relearning) for MSM replacement, setup, and programming