B1750

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

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




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM 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 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.

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 are Inactive.
- If not the specified value, 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 (A-D F-K) and the switch B+ terminal E with the switch in the open position.
- If less than the specified value, replace the switch.
3. Test for less than 1 ohm of resistance between each seat direction signal terminal (A-D F-K) and the switch B+ terminal E with the switch in the closed position.
- If greater than the specified value, replace the switch.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Seat Switch Replacement - Power
- Control Module References for memory seat module replacement, setup, and programming Programming and Relearning