DTC Descriptors
DTC B2853: Telescope Forward Switch Circuit HighDTC B2858: Telescope Rearward Switch Circuit High
DTC B2873: Tilt Up Switch Circuit High
DTC B2878: Tilt Down Switch Circuit High
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Steering Column Tilt Up Switch Signal | 5 | 1 | B2873 | -- |
Steering Column Tilt Down Switch Signal | 5 | 2 | B2878 | -- |
Steering Column Telescope Reverse Switch Signal | 5 | 3 | B2858 | -- |
Steering Column Telescope Forward Switch Signal | 5 | 4 | B2853 | -- |
1. Tilt up inoperative 2. Tilt down inoperative 3. Telescope reverse inoperative 4. Telescope forward inoperative 5. All tilt/telescope functions inoperative - HUD fuse open | ||||
Circuit/System Description
The instrument panel module (IPM) receives voltage inputs from the tilt/telescoping switch. The IPM sends a signal to the memory seat module (MSM) over the serial data line. The MSM supplies battery voltage to the telescoping actuator or tilt actuator depending on the movement requested. The telescope and tilt motors are bi-directional operating.
Conditions for Running the DTC
Ignition ON
Conditions for Setting the DTC
The IPM detects a switch input for more than 30 consecutive seconds.
Action Taken When the DTC Sets
| • | The applicable motor will be disabled for the duration of the ignition cycle. |
| • | Memory recall function will be disabled for the duration of the ignition cycle. |
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| • | A current DTC will clear when the failed switch input is no longer active.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 these DTCs to set.
Reference Information
Schematic Reference
Tilt/Telescoping Steering Column Schematics
Connector End View Reference
Steering Wheel and Column Connector End Views
Description and Operation
Steering Wheel and Column Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool tilt/telescope parameters while individually pressing each tilt/telescope of the switches. The reading should change between active and inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the tilt/telescope switch.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal F and ground.
- Verify the scan tool parameter for the appropriate switch is inactive.
- Install a 3-amp fused jumper wire between the appropriate signal circuit terminal and the B+ circuit terminal F. Verify the scan tool parameter is active.
- If all circuits test normal, test or replace the tilt/telescope switch.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the signal circuits for short to ground. |
| ⇒ | If not the specified value, test the signal circuit terminal for a short to voltage. If the circuit tests normal, replace the IPM. |
| ⇒ | If not the specified value, test the appropriate signal circuit for an open/high resistance. If the circuit tests normal, replace the IPM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPM and MSM replacement, setup, and programming |
