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Coupe




DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 (Coupe)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC B1735 01
- Seat Front Up Switch Circuit Short to Battery

DTC B1740 01
- Seat Front Down Switch Circuit Short to Battery

DTC B1745 01
- Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01
- Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01
- Seat Assembly Forward Switch Circuit Short to Battery

DTC B1760 01
- Seat Assembly Rearward Switch Circuit Short to Battery

DTC B1815 01
- Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01
- Seat Recline Rearward Switch Circuit Short to Battery

Diagnostic Fault Information






Circuit/System Description

When the driver seat adjuster switch is pressed, battery voltage is applied through the switch signal circuit to the memory seat module (MSM). The MSM then commands the appropriate driver seat motor to move in response to the switch signal. When a driver rear seat easy entry switch is pressed, battery voltage is applied through the switch signal circuit to the MSM. The MSM then commands the driver seat horizontal motor to move in response to the switch signal.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

B1755 01
* If the driver rear seat easy entry forward switch is stuck or the circuit is shorted to voltage, and the driver seat horizontal forward or rearward switch is pressed, this DTC will set.
* If the driver seat horizontal forward switch is stuck or the circuit is shorted to voltage, and the driver seat horizontal rearward switch is pressed, or, the driver rear seat easy entry forward or rearward switch is pressed, this DTC will set.

B1760 01
* If the driver rear seat easy entry rearward switch is stuck or the circuit is shorted to voltage, and the driver seat horizontal forward or rearward switch is pressed, this DTC will set.
* If the driver seat horizontal rearward switch is stuck or the circuit is shorted to voltage, and the driver seat horizontal forward switch is pressed, or, the driver rear seat easy entry forward or rearward switch is pressed, this DTC will set.

DTC B1735 01, B1740 01, B1745 01, B1750 01, B1815 01, or B1820 01
* 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 voltage on a switch signal circuit will set multiple DTCs.

Action Taken When the DTC Sets

B1755 01
* The rear seat easy entry forward switch input commands for the driver front seat are ignored.
* The MSM will respond to any other switch signal that has not set a DTC.

B1760 01
* The rear seat easy entry rearward switch input commands for the driver front seat are ignored.
* The MSM will respond to any other switch signal that has not set a DTC.

DTC B1735 01, B1740 01, B1745 01, B1750 01, B1815 01, or B1820 01
* A motor output driven in response to a switch considered failed, is deactivated for both directions.
* All memory recall commands are ignored for that motor.
* The MSM 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, 3 seconds after the fault is no longer present and the ignition is cycled OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

* If one of the switch signal circuits is shorted to voltage, 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 Driver Seat Schematics
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Memory Seats Description and Operation Memory Seats
Electrical Information Reference

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

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe all scan tool Seat 1 Inputs seat switch parameters while pressing and releasing the appropriate driver seat directional switch. The readings should change between Active and Inactive.
2. Observe the scan tool Seat 1 Inputs seat switch parameters listed below while pressing and releasing the appropriate driver rear seat easy entry forward and rearward switch. The readings should change between Active and Inactive.

* Horizontal/Easy Entry Forward Sw
* Horizontal/Easy Entry Rearward Sw

Circuit/System Testing

DTC B1755 01
1. Ignition ON, observe the scan tool Seat 1 Inputs Horizontal/Easy Entry Forward Sw parameter while pressing the driver rear seat easy entry FORWARD switch. The reading should be Active.

• If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the rear seat easy entry switch.

2. Ignition ON, observe the scan tool Horizontal/Easy Entry Forward Sw parameter while pressing the driver seat adjuster switch in the FORWARD direction. The reading should be Active.

• If not the specified value, test the signal circuit terminal D for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the driver seat adjuster switch.

3. If all circuits test normal, replace the memory seat module.

DTC B1760 01
1. Ignition ON, observe the scan tool Seat 1 Inputs Horizontal/Easy Entry Rearward Sw parameter while pressing the driver rear seat easy entry REARWARD switch. The reading should be Active.

• If not the specified value, test the signal circuit terminal B for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the rear seat easy entry switch.

2. Ignition ON, observe the scan tool Horizontal/Easy Entry Rearward Sw parameter while pressing the driver seat adjuster switch in the REARWARD direction. The reading should be Active.

• If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the driver seat adjuster switch.

3. If all circuits test normal, replace the memory seat module.

DTC B1735 01, B1740 01, B1745 01, B1750 01, B1815 01, or B1820 01
1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Verify all scan tool Seat 1 Inputs seat switch parameters listed below are Inactive.

* Front Vertical Upward Switch
* Front Vertical Downward Switch
* Rear Vertical Upward Switch
* Rear Vertical Downward Switch
* Recline Forward Switch
* Recline Rearward Switch

• If not the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.

* Front vertical upward switch terminal A (LHD)
* Front vertical upward switch terminal K (RHD)
* Front vertical downward switch terminal K (LHD)
* Front vertical downward switch terminal A (RHD)
* Rear vertical upward switch terminal F (LHD)
* Rear vertical upward switch terminal J (RHD)
* Rear vertical downward switch terminal J (LHD)
* Rear vertical downward switch terminal F (RHD)
* Recline forward switch terminal H
* Recline rearward switch terminal G

3. If all circuits test normal, test or replace the seat adjuster switch.

Component Testing

Rear Seat Easy Entry Switch
1. Ignition OFF, disconnect the harness connector at the rear seat easy entry switch.
2. Test for infinite resistance between the B+ terminal A and each seat direction signal terminal with the switch in the open position.

• If not the specified value, replace the rear seat easy entry switch.

3. Test for less than 1 Ohms between the B+ terminal A and each seat direction signal terminal with the appropriate switch in the closed position.

• If greater than the specified value, replace the rear seat easy entry switch.

Driver Seat Adjuster Switch
1. Ignition OFF, disconnect the harness connector at the driver seat adjuster switch.
2. Test for infinite resistance between the B+ terminal E and each seat direction signal terminal with the switch in the open position.

• If not the specified value, replace the driver seat adjuster switch.

3. Test for less than 1 Ohms between the B+ terminal E and each seat direction signal terminal with the appropriate switch in the closed position.

• If greater than the specified value, replace the driver seat adjuster switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Front Seat Adjuster Switch Replacement - Driver Side (AQ9) Front Seat Adjuster Switch Replacement - Driver Side (AQ9)Front Seat Adjuster Switch Replacement - Driver Side (W2E) Front Seat Adjuster Switch Replacement - Driver Side (W2E)
* Driver or Passenger Seat Back Cushion Latch Release Handle Replacement (Coupe) Driver or Passenger Seat Back Cushion Latch Release Handle Replacement (Coupe)
* Control Module References Control Module References for MSM replacement, setup, and programming

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