Buick Regal: Symptoms - Power Seats
NOTE: The following steps must be completed before using the symptom
tables.
1. Perform the Diagnostic System Check - Vehicle before using the Symptom
Tables in order to
verify that all of the following are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the
system functions. Refer to
the following system descriptions:
- Lumbar Support Description and Operation (With Memory Seat A44/A45)
or Lumbar
Support Description and Operation (Without Memory Seat A44/A45)
- Memory Seats Description and Operation
- Power Seats System Description and Operation
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the
system. Refer to Checking Aftermarket Accessories.
- Inspect the easily accessible or visible system components for obvious
damage or conditions
which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent
conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to
diagnose the symptom:
- Lumbar/Bolster/Massage Malfunction (AVK with AF6 or AVU with AKE),
Lumbar/Bolster/Massage Malfunction (AVK without AF6 or AVU without AKE), or
Lumbar/Bolster/Massage Malfunction (AL9 or AT9)
- Memory Seat Feature Malfunction
- 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)
- Power Folding Seat Malfunction
Lumbar/Bolster/Massage Malfunction (AVK with AF6 or AVU with AKE)
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. The lumbar, bolster, and massage functions are inoperative
Circuit/System Description
Ground is supplied to the driver and passenger seat lumbar support and the
seat back side bolster
switches. Each switch is also supplied with a 5 V reference and signal circuits
from the seat memory
control module. The reference voltage is applied to a resistive network internal
to the switches. When a
switch is pressed, the output of the resistive network results in a voltage drop
on the signal circuit to the
seat memory control module indicating the lumbar, bolster, or massage request.
In response to this
signal, the seat memory control module sends a LIN serial data message to the
seat massage valve
assembly commanding it to perform the required pneumatic movements.
The seat massage valve assembly contains the electronic circuitry for executing
the commanded
pneumatic seat adjustments, air direction solenoids, pressure sensors for
storing air bladder pressures,
and outputs which supplies battery power and a low side drive pulse width
modulated (PWM) signal to
the external seat air pump motor when any of the air bladders require inflating.
Reference Information
Schematic Reference
- Driver Seat Wiring Schematics
- Passenger Seat Wiring Schematics
Connector End View Reference
Component Connector End View Index
Description and Operation
Lumbar Support Description and Operation (With Memory Seat A44/A45) or
Lumbar Support
Description and Operation (Without Memory Seat A44/A45)
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 the appropriate scan tool Driver or Passenger Lumbar Support
Horizontal Switch parameter
changes between Inactive and Forward/Rearward when pressing the lumbar
horizontal switch in
the Forward and Rearward directions.
- If the parameter does not change in either direction
Refer to DTC B183B or B183C.
- Go to next step: If the parameter changes for both directions
3. Verify the scan tool Lumbar Support Vertical Switch parameter changes
between Inactive and
Up/Down when pressing the lumbar vertical switch in the Up and Down directions.
- If the parameter does not change
Test or replace the S65 Seat Lumbar Support Switch.
- Go to next step: If the parameter changes
4. Verify the scan tool Seat Back Side Bolster Switch parameter changes
between Inactive and
Inflate/Deflate when pressing the bolster switch in both directions.
- If the parameter does not change
Refer to DTC B183B or B183C.
- Go to next step: If the parameter changes
5. Verify the scan tool Seat Massage Switch parameter changes between
Inactive and Active when
pressing the seat massage switch.
- If the parameter does not change
Test or replace the S66 Seat Back Side Bolster Adjuster Switch.
- Go to next step: If the parameter changes
6. Refer to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF, all vehicle systems OFF, disconnect the harness connector at
the appropriate seat
bolster memory control module listed below. It may take up to 2 min for all
vehicle systems to
power down.
- K134D Seat Bolster Memory Control Module - Driver
- K134P Seat Bolster Memory Control Module - Passenger
2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 10 Ω
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
- If the test lamp does not illuminate
- Ignition OFF, remove the test lamp.
- Test for infinite resistance between the B+ 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 B+ circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, verify the fuse is not open and there is voltage
at the fuse.
- Go to next step: If the test lamp illuminates
5. Ignition OFF, connect the harness connector at the K134 Seat Bolster
Memory Control Module
and disconnect the harness connector at the G31 Seat Lumbar/Bolster Pump.
6. Test for less than 10 Ω between the low reference circuit terminal 2 and
ground.
- Ignition OFF.
- 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 K134 Seat Bolster Memory Control
Module.
- Go to next step: If less than 10 Ω
7. Connect a test lamp between the control circuit terminal 1 and ground,
ignition ON.
8. Verify the test lamp turns ON when pressing the lumbar forward switch.
- If the test lamp remains OFF
- Ignition OFF, remove the teat lamp, disconnect the harness connector at
the K134 Seat
Bolster Memory Control Module.
- Test for infinite resistance between the control 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 control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit
- If less than 2 Ω, replace the K134 Seat Bolster Memory Control
Module.
- If the test lamp remains ON
- Ignition OFF, remove the teat lamp, disconnect the harness connector at
the K134 Seat
Bolster Memory Control Module, ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K134 Seat Bolster Memory Control
Module.
- Go to next step: If the test lamp turns ON and OFF
9. Test or replace the G31 Seat Lumbar/Bolster Pump.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Driver or Passenger Seat Lumbar Control Switch Replacement
- Front Seat Back Lumbar Replacement (2 Way) or Front Seat Back Lumbar
Replacement
(GS) or Front Seat Back Lumbar Replacement (4 Way)
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:
Airbags affect how the vehicle
should be serviced. There are parts
of the airbag system in several
places around the vehicle. Your
dealer and the service manual have
information about servicing the
vehicle and the airbag system. To
purchase a service manual.
Warning:
For up to 10 seconds after the
v
Special Tools
BO-38185 Hose Clamp Pliers
GE-47622 Hose Clamp Pliers.
Equivalent regional tools: Special Tools
Spring Type Hose Clamp Replacement Guidelines
Vehicles utilize spring type hose clamps (1) to secure joints in which
fluids, gases, or engine vacuum can
travel to various vehicle syste