Chevrolet Trax: Memory seat feature malfunction

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.

Diagnostic Fault Information

Circuit/System Description

Low reference is supplied to the driver seat memory switch from the seat memory control module. When a memory switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.

Diagnostic Aids

The seat memory control module must be awake when measuring voltage from either one of the memory seat switch signal circuits. Voltage readings of 0.0 V or 5 V are possible if the module is not fully awake and result in misdiagnosing the circuit.

Reference Information

Schematic Reference

Driver Seat Schematics (Encore), Driver Seat Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Memory Seats Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify that all manual driver power seat functions operate when being controlled by the power seat adjuster switches.

If any seat function does not operate

Refer to Power Seat Malfunction (Without Memory A45), Power Seat Malfunction (With Memory A45).

If all seat functions operate

3. Verify that the memory recall personalization option is ON. Refer to the owners manual.

If the memory recall personalization option is not ON

Turn ON the option, refer to the Owners Manual.

If the memory recall personalization option is ON

4. Refer to Circuit/System Testing.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver.
2. Test for less than 20 ohms between the low reference circuit terminal 1 and ground.

If 20 ohms or greater

1. Ignition OFF, disconnect the X2 harness connector at the K40 Seat Memory Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K40 Seat Memory Control Module.

If less than 20 ohms

3. Ignition ON, press a power seat switch in order to wake up the K40 Seat Memory Control Module.
4. Test for 9 V or greater between each signal circuit terminal listed below and ground:

• Memory set switch signal terminal 5
• Memory switch signal terminal 6

If less than 9 V

1. Ignition OFF, disconnect the X2 harness connector at the K40 Seat Memory Control Module.
2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K40 Seat Memory Control Module.

If 9 V or greater

5. Ignition OFF, disconnect the X2 harness connector at the K40 Seat Memory Control Module, ignition ON.
6. Test for less than 1 V between each signal circuit terminal listed below and ground:

• Memory set switch signal terminal 5
• Memory switch signal terminal 6

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

7. Test or replace the S47D Seat Memory Switch - Driver.

Component Testing

Driver Seat Memory Switch

1. Ignition OFF, disconnect the harness connector at the S47D Seat Memory Switch - Driver.
2. Test for infinite resistance between each signal terminal listed below and the low reference terminal 5 with the switch in the open position.

• Terminal 1
• Terminal 6

If less than infinite resistance

Replace the S47D Seat Memory Switch - Driver.

If infinite resistance

3. Test for less than 2 ohms between the signal terminal 1 and the low reference terminal 5 while pressing the memory MEM button.

If 2 ohms or greater

Replace the S47D Seat Memory Switch - Driver.

If less than 2 ohms

4. Test for 570-698 ohms between the signal terminal 6 and the low reference terminal 5 while pressing the memory 1 button.

If not between 570-698 ohms

Replace the S47D Seat Memory Switch - Driver.

If between 570-698 ohms

5. Test for 1800-2209 ohms between the signal terminal 6 and the low reference terminal 5 while pressing the memory 2 button.

If not between 1800-2209 ohms

Replace the S47D Seat Memory Switch - Driver.

If between 1800-2209 ohms

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Driver Seat Adjuster Memory Switch Replacement (Encore)
• Control Module References for K40 Seat Memory Control Module replacement, programming and setup

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