Sedan, Wagon
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 (Sedan, Wagon)
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 power seat switches are pressed, they send a 12 V signal through the switch signal circuits to the memory seat module (MSM). The MSM then commands the driver seat and lumbar motors to move in response to the switch signals.
Conditions for Running the DTC
The MSM must be powered.
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 voltage 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 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
Ignition ON, observe all scan tool Memory Seat Module seat switch parameters while pressing and releasing each seat directional switch. The readings should change between Inactive and Active.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Verify all scan tool seat switch parameters listed below are Inactive.
* Front Vertical Upward Switch
* Front Vertical Downward Switch
* Rear Vertical Upward Switch
* Rear Vertical Downward Switch
* Horizontal Forward Switch
* Horizontal Rearward 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)
* Horizontal forward switch terminal D
* Horizontal rearward switch terminal C
* 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
1. Ignition OFF, disconnect the harness connector at the 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 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 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)
* Control Module References Control Module References for MSM replacement, setup, and programming