GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Chevy Suburban - 4WD 🢒 Seats 🢒 Power Seats 🢒 DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

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 01: Driver Seat Front Up Switch Circuit Short to Battery

DTC B1740 01: Driver Seat Front Down Switch Circuit Short to Battery

DTC B1745 01: Driver Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01: Driver Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01: Driver Seat Assembly Horizontal Forward Switch Circuit Short to Battery

DTC B1760 01: Driver Seat Assembly Horizontal Rearward Switch Circuit Short to Battery

DTC B1815 01: Driver Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01: Driver Seat Recline Rearward Switch Circuit Short to Battery

Circuit Description

When the power seat switches are pressed, they send a 12-volt signal through the switch signal circuits to the memory seat module (MSM). The MSM then commands the driver seat motors to move in response to the switch signals.

Conditions for Running the DTC

The memory seat module 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.
    • Multiple DTCs will set if one of the switch signal circuits is shorted to voltage.

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.
    • A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.

Reference Information

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Power Seat Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Scan Tool Data List

Circuit/System Verification

Ignition ON, observe the scan tool seat switch parameters while pressing the appropriate seat directional switches. The reading should change between Inactive and Active.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
  2. Test for infinite resistance between each seat direction signal terminal and the switch B+ terminal with the switch in the open position.
    3. ⇒If not Inactive, test the signal circuit that displays Active for a short to voltage. If the circuit tests normal, replace the MSM.
  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 each seat direction signal terminal and the switch B+ terminal with the switch in the open position.
    3. ⇒If less than infinite resistance, replace the switch.
  3. Test for less than 1 ohm of resistance between each seat direction signal terminal and the B+ terminal with the switch in the closed position.
    4. ⇒If greater than 1 ohm, replace the switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Power Seat Switch Replacement
    •  Control Module References for memory seat module replacement, setup, and programming