Circuit Description
The memory seat and telescoping steering column position settings are stored in the LH Seat Control Module (SCM). The SCM measures and stores the steering column position by using a position sensor, which is an internal part of the telescoping actuator. The SCM provides the position sensor with a 5 volt power supply, and ground. The SCM monitors the position sensor signal voltage, which ranges from 0.1-4.78 volts depending on the steering column position. The steering column position sensor becomes active only when the SCM detects a steering column switch input.
Conditions for Setting the DTC
The steering column position sensor signal, to the SCM, is less than 0.1 volt or greater than 4.78 volts for 2 seconds or more.
Action Taken When the DTC Sets
| • | A history DTC B2860 is stored in the SCM memory. |
| • | This DTC can only be set as a history code even if the malfunction is current. |
| • | No driver warning message will be displayed for this DTC. |
| • | The memory operation/function of the faulted position sensor is disabled. |
Conditions for Clearing the DTC
| • | The steering column position sensor input, to the SCM, is within 0.1 volt to 4.78 volts for 2 seconds or more. |
| • | Using a scan tool. |
Diagnostic Aids
| • | If the DTC does not reset after the code is cleared the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | The following conditions may also cause an intermittent malfunction: |
| - | There is an intermittent open, short to ground, or short to voltage in steering column telescope motor signal circuit. |
| - | The steering column position sensor is open or shorted internally. |
| • | If the SCM is unable to determine the correct steering column position, limited manual operation of the telescoping steering column will be functional, but the SCM will be unable to recall the correct memory settings. |
| • | Using a scan tool, select SCM data display and monitor the Column Position Fdbk data. Operate the steering column in both directions while monitoring the position sensor data. The voltage should range from 0.1 volt to 4.78 volts depending on the steering column position. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests for the proper operation of the circuit in the high voltage range.
-
Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
-
Tests for a short to ground in the 5 volt reference circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Tilt/Telescoping Steering Column Schematics | ||||
1 | Did you perform the Steering Wheel and Column Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Steering Wheel and Column - Tilt |
2 |
Does the scan tool indicate that the Column Position Feedback data parameter is within the specified range? | 0.1-4.78 V | Go to Diagnostic Aids | Go to Step 3 |
Does the scan tool indicate that the Column Position Feedback data parameteris greater than the specified value? | 4.78 V | Go to Step 4 | Go to Step 8 | |
Does the scan tool indicate that the Column Position Feedback data parameter is less than the specified value? | 0.1 V | Go to Step 5 | Go to Step 9 | |
Does the scan tool indicate that the Column Position Feedback data parameter is greater than the specified value? | 4.78 V | Go to Step 7 | Go to Step 6 | |
6 | Test the 5 volt reference circuit of the Telescoping Sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 |
7 | Test the 5 volt reference circuit of the Telescoping Sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 |
8 | Test the signal circuit of the Telescoping Sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 |
9 | Test the signal circuit of the Telescoping Sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 10 |
10 | Test the low reference circuit of the Telescoping Sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the Telescoping Sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 |
12 | Inspect for poor connections at the harness connector of the Seat Control Module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14 |
13 | Replace the Telescoping Sensor. Refer to Telescope Actuator Switch Replacement - On Vehicle . Did you complete the replacement? | -- | Go to Step 15 | -- |
14 |
Important: Perform the set up procedure for the Seat Control Module. Replace the Seat Control Module. Refer to Memory Seat Control Module Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
15 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
