Chevrolet Trax: DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, OR B1820: Driver seat switch

DIAGNOSTIC CODE INDEX

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 Descriptors

DTC B1735 02

Driver Seat Front Up Switch Circuit Short to Ground

DTC B1740 02

Driver Seat Front Down Switch Circuit Short to Ground

DTC B1745 02

Driver Seat Rear Up Switch Circuit Short to Ground

DTC B1750 02

Driver Seat Rear Down Switch Circuit Short to Ground

DTC B1755 02

Driver Seat Assembly Forward Switch Circuit Short to Ground

DTC B1760 02

Driver Seat Assembly Rearward Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The seat memory control module supplies a reference voltage to each signal circuit of the driver seat adjuster switch. When the power seat switches are pressed, the appropriate signal circuit from the seat memory control module is pulled low through the switch contacts indicating the power seat command. The seat memory control module then commands the driver seat to move in response to the switch signals.

Conditions for Running the DTC

• DTC B1325 must not be present.
• Module battery voltage must be between 9-16 V.

Conditions for Setting the DTC

• If a seat switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.
• A short to ground on a switch signal circuit.

Action Taken When the DTC Sets

• A motor output driven in response to a switch considered failed, is deactivated for both directions.

  All memory recall commands are ignored.

• The seat memory control module will respond to any other switch signal that has not set a DTC.

Conditions for Clearing the DTC

• The current DTC will clear and set the code to history, when the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.
• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

• If one of the switch signal circuits is shorted to ground, multiple codes will set.
• If a switch is stuck in one direction and the switch is pressed in the opposite direction, a single code will set.

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 the scan tool seat switch parameters listed below change between Inactive and Forward/Rearward or UP/Down when pressing the appropriate seat directional switch.

• Driver Seat Cushion Front Vertical Switch
• Driver Seat Cushion Rear Vertical Switch
• Driver Seat Horizontal Switch

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the S64D Seat Adjuster Switch - Driver, Ignition ON.
2. Verify that all scan tool driver seat switch parameters listed below are Inactive:

• Driver Seat Cushion Front Vertical Switch
• Driver Seat Cushion Rear Vertical Switch
• Driver Seat Horizontal Switch

If not Inactive

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

• Front vertical up switch terminal G
• Front vertical down switch terminal E
• Rear vertical up switch terminal H
• Rear vertical down switch terminal A
• Horizontal forward switch terminal F
• Horizontal rearward switch terminal C

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

If infinite resistance, replace the K40 Seat Memory Control Module.

If Inactive

3. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and the ground circuit terminal D.

• Front vertical up switch terminal G
• Front vertical down switch terminal E
• Rear vertical up switch terminal H
• Rear vertical down switch terminal A
• Horizontal forward switch terminal F
• Horizontal rearward switch terminal C

4. Verify the scan tool seat switch parameter is Forward/Rearward or UP/Down.

If not Forward/Rearward or UP/Down

1. Ignition OFF, disconnect the harness connector at the K40 Seat Memory Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V

3. Ignition OFF.
4. 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 Forward/Rearward or UP/Down

5. Test or replace the S64D Seat Adjuster Switch - Driver.

Component Testing

Seat Adjuster Switch Test

1. Ignition OFF, disconnect the harness connector at the Seat Adjuster Switch - Driver.
2. Test for infinite resistance between the ground terminal D and each signal terminal with the switch in the open position.

If less than infinite resistance

Replace the Seat Adjuster Switch - Driver.

If infinite resistance

3. Test for less than 2 ohms between the ground terminal D and each signal terminal with the appropriate switch in the closed position.

If 2 ohms or greater

Replace the Seat Adjuster Switch - Driver.

If less than 2 ohms

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Driver or Passenger Seat Adjuster Switch Replacement
• Control Module References for K40 Seat Memory Control Module replacement, programming and setup

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