B2755
DTC B2755 or B2765
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 B2755 00
- Driver Memory Select Switch Circuit
DTC B2755 01
- Driver Memory Select Switch Circuit Short to Battery
DTC B2755 02
- Driver Memory Select Switch Circuit Short to Ground
DTC B2765 02
- Driver Memory Set Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
Low reference is supplied to the driver seat memory switch from the seat memory control module. When a memory switch is pressed, the signal circuit from the seat memory control module is pulled low through the switch contacts and series of resistors indicating the memory recall request. In response to this signal, the seat memory control module commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.
Conditions for Running the DTC
* DTC B1327 must not be present.
* Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
B2755 01
If the seat memory control module detects a short to voltage on the memory switch signal circuit this DTC will set.
B2755 02
If the seat memory control module detects a short to voltage on the memory set switch signal circuit this DTC will set.
B2765 02
If the memory set switch signal is active for greater than 30 seconds, the module will set this DTC.
Actions Taken When the DTC Sets
* Current and history codes are set.
* All memory recall commands and are ignored.
Conditions for Clearing the DTCs
* The DTC automatically clears when the switch circuit setting the DTC is no longer active.
* A history DTC will clear once 50 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Driver Seat Schematics Driver Seat Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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.
2. Verify the scan tool Seat Memory Control Module Memory Recall Switches parameter changes between Inactive and Memory 1 when pressing the memory 1 switch.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
3. Verify the scan tool Seat Memory Control Module Memory Recall Switches parameter changes between Inactive and Memory 2 when pressing the memory 2 switch.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
4. Verify the scan tool Memory Recall Switches parameter changes between Inactive and Exit when pressing the EXIT switch.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
5. Verify the scan tool Memory Recall Switches parameter changes between Inactive and Set when pressing the SET switch.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
6. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the S47D Driver Seat Memory Switch.
2. Ignition ON, press a power seat switch in order to wake up the K40 Seat Memory Control Module.
3. Test for 9 V or greater between each signal circuit terminal listed below and ground:
* Memory set switch signal terminal 5
* Memory switch signal terminal 6
• If less than 9 V
1. Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K40 Seat Memory Control Module.
• If 9 V or greater
4. Ignition OFF, disconnect the X3 harness connector at the K40 Seat Memory Control Module, ignition ON.
5. Test for less than 1 V between each signal circuit terminal listed below and ground:
* Memory set switch signal terminal 5
* Memory switch signal terminal 6
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
6. Test or replace the S47D Driver Seat Memory Switch.
Component Testing
Driver Seat Memory Switch
1. Ignition OFF, disconnect the harness connector at the S47D Driver Seat Memory Switch.
2. Test for infinite resistance between each signal terminal listed below and the low reference terminal 1 with the switch in the open position.
* Terminal 5
* Terminal 6
• If less than infinite resistance
Replace the S47D Driver Seat Memory Switch.
• If infinite resistance
3. Test for less than 4 ohms between the signal terminal 5 and the low reference terminal 1 while pressing the memory SET button.
• If 4 ohms or greater
Replace the S47D Driver Seat Memory Switch.
• If less than 4 ohms
4. Test for 573-701 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 1 button.
• If not between 573-701 ohms
Replace the S47D Driver Seat Memory Switch.
• If between 573-701 ohms
5. Test for 1800-2201 ohms between the signal terminal 6 and the low reference terminal 1 while pressing the memory 2 button.
• If not between 1800-2201 ohms
Replace the S47D Driver Seat Memory Switch.
• If between 1800-2201 ohms
6. Test for 5.52k-6.73 kohms between the signal terminal 6 and the low reference terminal 1 while pressing the Exit button.
• If not between 5.52k-6.73 kohms
Replace the S47D Driver Seat Memory Switch.
• If between 5.52k-6.73 kohms
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Driver Seat Adjuster Memory Switch Replacement Service and Repair
* Control Module References Control Module References for K40 Seat Memory Control Module replacement, programming and setup