B1815
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820
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 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
DTC B1815 02
- Driver Seat Recline Forward Switch Circuit Short to Ground
DTC B1820 02
- Driver Seat Recline 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 (Driver Seat Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Seat Memory Control Module seat switch parameters listed below while pressing and releasing the appropriate seat directional switch. The readings should change between Inactive and Forward/Rearward or UP/Down.
* Driver Seat Cushion Front Vertical Switch
* Driver Seat Cushion Rear Vertical Switch
* Driver Seat Horizontal Switch
* Driver Seat Back Switch
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the S64D driver seat adjuster switch.
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
* Driver Seat Back Switch
• If not the specified value, test the appropriate signal circuit listed below for a short to ground. If the circuit tests normal, replace the K40 seat memory control module.
* Front vertical upward switch terminal A
* Front vertical downward switch terminal K
* Rear vertical upward switch terminal F
* Rear vertical downward switch terminal J
* 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 S64D driver seat adjuster switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the S64D driver seat adjuster switch.
2. Test for infinite resistance between the ground terminal E and each seat direction signal terminal with the switch in the open position.
• If not the specified value, replace the S64D driver seat adjuster switch.
3. Test for less than 2 Ohms between the ground terminal E and each signal terminal with the appropriate switch in the closed position.
• If greater than the specified value, replace the S64D driver seat adjuster switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver Seat Adjuster Switch Replacement (Driver Seat Adjuster Switch Replacement)
* Control Module References (Programming and Relearning) for seat memory control module replacement, setup, and programming