Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
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
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
B+, TILT / TELE SW / MEM SEAT MOD Fuse | Open TILT / TELE SW / MEM SEAT MOD Fuse | Tilt / telescope inoperative | -- |
Steering Column Tilt Up Switch Signal | Open TILT / TELE SW / MEM SEAT MOD Fuse | Tilt up inoperative | B2873 |
Steering Column Tilt Down Switch Signal | Open TILT / TELE SW / MEM SEAT MOD Fuse | Tilt down inoperative | B2878 |
Steering Column Telescope Reverse Switch Signal | Open TILT / TELE SW / MEM SEAT MOD Fuse | Telescope reverse inoperative | B2858 |
Steering Column Telescope Forward Switch Signal | Open TILT / TELE SW / MEM SEAT MOD Fuse | Telescope forward inoperative | B2853 |
Circuit/System Description
The memory seat module - driver receives voltage inputs from contacts inside the tilt/telescoping switch. The memory seat module - driver then supplies battery voltage to the tilt actuator up or down circuit, or the telescoping drive motor forward or reverse 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. The memory seat module - driver monitors the position and movement of the tilt actuator and telescoping drive motor on the sensor signal circuits.
Conditions for Running the DTC
Ignition ON
Conditions for Setting the DTC
The memory seat module - driver 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| • | A current DTC will clear when the failed switch input is no longer active.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. Also, the driver can cause this DTC to set by holding the switch for 30 seconds after the column reaches the end of its travel.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Steering Wheel and Column Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Tilt Up Switch, Tilt Down Switch, Telescope Forward Switch, and Telescope Rearward Switch parameters in the Driver Position Module Data Display. The reading should be Inactive for all 4 parameters when the switch is not pressed.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector X2 at the memory seat module - driver.
- Ignition OFF, test for less than 1 volt on each of the switch signal circuits terminals E9, E10, E11, and E12.
- If all circuits test normal, test or replace the memory seat module - driver.
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the tilt/telescope switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for memory seat module - driver replacement, setup, and programming |
