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 Descriptor
DTC B2870 01: Tilt Up Switch Circuit Short to BatteryDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Steering Column Tilt Up Switch Signal | 1 | 1 | B2870 01 | -- |
Steering Column Tilt Down Switch Signal | 1 | 1 | B2875 01 | -- |
Steering Column Telescope Reverse Switch Signal | 2 | 2 | B2855 01 | -- |
Steering Column Telescope Forward Switch Signal | 2 | 2 | B2850 01 | -- |
1. Tilt Malfunction 2. Telescope Malfunction | ||||
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 up switch input for more than 30 consecutive seconds after up movement of the motor has stopped.
Action Taken When the DTC Sets
| • | The tilt 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| • | A current DTC will clear when the failed switch input is no longer active.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 switch may cause this DTC to set. |
| • | The power column features such as the power tilt/telescope switch, tilt/telescope actuator, and tilt/actuator assembly are internal to the steering column and only replaced as a complete unit. So any power actuator or switch replacement can only be done as a complete unit. |
Reference Information
Schematic Reference
Tilt/Telescoping Steering Column Schematics
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, view the scan tool Tilt Up Switch parameter while cycling the tilt/telescope switch between the neutral and TILT UP position. The parameter should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the tilt/telescope switch.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
- Verify the scan tool Tilt Up Switch parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 2 and the B+ circuit terminal 1. Verify the scan tool Tilt Up Switch parameter is Active.
- If all circuit test normal, test or replace the steering column.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM. |
| ⇒ | 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. |
Component Testing
Tilt/Telescope Switch
- Ignition OFF, disconnect the harness connector at the tilt/telescope switch.
- Test for infinite resistance between the following terminals with the switch in the neutral position:
- Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 2 with the switch in the TILT UP position.
- Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 6 with the switch in the TILT DOWN position.
- Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 3 with the switch in the TELESCOPE OUT position.
- Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 5 with the switch in the TELESCOPE IN position.
| • | B+ terminal 1 and signal terminal 5 |
| • | B+ terminal 1 and signal terminal 6 |
| • | B+ terminal 1 and signal terminal 2 |
| • | B+ terminal 1 and signal terminal 3 |
| ⇒ | If less than the specified range, replace the steering column. |
| ⇒ | If greater than the specified range, replace the steering column. |
| ⇒ | If greater than the specified range, replace the steering column. |
| ⇒ | If greater than the specified range, replace the steering column. |
| ⇒ | If greater than the specified range, replace the steering column. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for MSM replacement, setup, and programming |
