Circuit Description
The 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 signal circuit under 0.1 volt or over 4.78 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. |
| • | The memory functions of the adjuster motor for which the DTC has set will be disabled for 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
Operate the adjuster motor through the full range of adjustment while monitoring the position sensor parameter on the scan tool. If the problem is intermittent refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests for the proper operation of the signal circuit in the high voltage range.
-
Tests for the proper operation of the signal 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: Memory Seats Schematics | ||||
1 | Did you perform the Power Seats Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the position sensor 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 position sensor parameter is greater than the specified value? | 4.5 V | Go to Step 4 | Go to Step 8 | |
Does the scan tool indicate that the position sensor parameter is less than the specified value? | 0.5 V | Go to Step 5 | Go to Step 9 | |
Does the scan tool indicate that the position sensor parameter is greater than the specified value? | 4.5 V | Go to Step 7 | Go to Step 6 | |
6 | Test the 5 volt reference circuit 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 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 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 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 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 position 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 memory seat 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 position sensor for which the DTC has set. Refer to Front Seat Adjuster Motor Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- |
14 | Replace the memory seat 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 |
