Buick Regal: Memory Seat Feature Malfunction
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.
Diagnostic Fault Information
1. Memory seat feature is inoperative
Circuit/System Description
Low reference is supplied to the 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 prerecorded
seat positions stored in memory.
Diagnostic Aids
- The seat memory control module must be awake when measuring voltage from
either one of the
memory seat switch signal circuits. Voltage readings of 0.0 V or 5.0 V are
possible if the module
is not fully awake and result in misdiagnosing the circuit.
- When using remote keyless entry for vehicle access, the driver seat
memory functions will operate
only with transmitters 1 and 2. Transmitters 3 - 8 cannot be programmed for
memory seat
functions.
Reference Information
Schematic Reference
- Driver Seat Wiring Schematics
- Passenger Seat Wiring Schematics
Connector End View Reference
Component Connector End View Index
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Ignition ON.
2. Verify that all manual power seat functions operate when being controlled by
the power seat
adjuster switches.
- If any manual power seat function does not operate
Refer to Power Seat Malfunction (Driver or Passenger without Memory A44
or A45),
Power Seat Malfunction (Driver Seat with Memory A45), or Power Seat
Malfunction
(Passenger Seat with Memory A44)
- Go to next step: If all manual power seat functions operate
3. Refer to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate seat
memory switch listed
below:
- S47D Seat Memory Switch - Driver
- S47P Seat Memory Switch - Passenger
2. Test for less than 30 Ω between the low reference circuit terminal 1 and
ground.
- Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory
Control
Module.
- Test for less than 2 Ω in the low reference circuit end to end
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K40 Seat Memory Control Module.
- Go to next step: If less than 30 Ω
3. Ignition ON, press a power seat switch in order to wake up the K40 Seat
Memory Control
Module.
4. 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
- Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory
Control
Module.
- Test for infinite resistance between the signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K40 Seat Memory Control Module.
- Go to next step: If 9 V or greater
5. Ignition OFF, disconnect the X6 harness connector at the K40 Seat Memory
Control Module,
ignition ON.
6. 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.
- Go to next step: If less than 1 V
7. Test or replace the S47 Seat Memory Switch.
Component Testing
Seat Memory Switch
1. Ignition OFF, disconnect the harness connector at the S47 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 S47 Seat Memory Switch.
- Go to next step: If infinite resistance
3. Test for less than 4 Ω between the signal terminal 5 and the low reference
terminal 1 while
pressing the memory SET button.
Replace the S47 Seat Memory Switch.
- Go to next step: If less than 4 Ω
4. Test for 573 - 701 Ω between the signal terminal 6 and the low reference
terminal 1 while pressing
the memory 1 button.
- If not between 573 - 701 Ω
Replace the S47 Seat Memory Switch.
- Go to next step: If between 573 - 701 Ω
5. Test for 1800 - 2201 Ω between the signal terminal 6 and the low reference
terminal 1 while
pressing the memory 2 button.
- If not between 1800 - 2201 Ω
Replace the S47 Seat Memory Switch.
- Go to next step: If between 1800 - 2201 Ω
6. Test for 5.52k - 6.73 kΩ between the signal terminal 6 and the low
reference terminal 1 while
pressing the Exit button.
- If not between 5.52k - 6.73 kΩ
Replace the S47 Seat Memory Switch.
- Go to next step: If between 5.52k - 6.73 kΩ
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Front Seat Adjuster Memory Switch Replacement
- Control Module References for K40D Seat Memory Control Module - Driver
or K40P Seat Memory Control Module - Passenger replacement, programming and
setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
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
D
Special Tools
CH-230 - A Disc Gauge
Equivalent regional tools: Special Tools
WARNING: Refer to Brake Dust Warning.
1. If the inboard friction surface of the brake rotor is not accessible,
reposition and support the caliper
with the brake pads. Refer to Front Disc Brake Pads Replacement (J60)Front D