Circuit Description
The telescoping steering column actuator and seat adjuster motors are equipped with position sensors. The position sensors are supplied with a common 5-volt reference circuit and low reference circuit from the memory seat module. The memory seat module receives a signal voltage from each position sensor whenever a memory seat module output function is active.
Conditions for Running the DTC
The memory seat module detects a switch signal active or a memory function request.
Conditions for Setting the DTC
| • | The memory seat module detects the position sensor 5-volt reference circuit under 4.0 volts or over 5.2 volts. |
| • | The condition must be present for 2 seconds. |
Action Taken When the DTC Sets
| • | A history DTC is stored in the memory seat module. |
| • | Memory seat module DTCs can only be set as history codes even if the malfunction is current. |
| • | Memory functions will be disabled as long as the fault is current. |
Conditions for Clearing the DTC
Memory seat module DTCs may be cleared only by using a scan tool or the IPC clearing DTCs feature.
Diagnostic Aids
| • | Monitor the position sensor reference parameter in the SCM data list, if the fault is current. Disconnecting position sensor connectors or the inline connector to the steering column may help to determine where the fault is occurring. |
| • | If the fault is not current and all the adjuster motors operate through the full range of adjustment, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Memory Seats Schematics Connector End View Reference: Power Seat Connector End Views | ||||
1 | Did you perform the Power Seat Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the position sensor reference voltage remain within the specified values? | 4.0-5.2 V | Go to Diagnostic Aids | Go to Step 3 |
Is the position sensor reference voltage within the specified values? | 4.0-5.2 V | Go to Step 5 | Go to Step 4 | |
4 | Test the position sensor 5-volt reference circuit for a short to ground or short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
5 | Test the position sensor low reference circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
6 | Test the position sensor signal circuits for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did You find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the memory seat module. Refer to Memory Seat Control Module Replacement . Is the repair complete? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
