Power Seat System Buick Regal V

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Symptoms - Power Seats

Note. The following steps must be completed before using the symptom tables.

Review the system operation in order to familiarize yourself with the system functions. Refer to the following system descriptions

1. «Lumbar Support Description and Operation»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
2. «Power Seats System Description and Operation»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system__power-seats-system-description-and-operation)

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the power seat system. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Inspect the power seat for proper mechanical operation.

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

1. «Lumbar Support Malfunction»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
2. «Power Seat Malfunction»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

Battery voltage is supplied at all times to the driver and passenger seat lumbar support switches through 15 A fuses located in the instrument panel fuse block. When a lumbar switch is pressed to inflate the lumbar support, battery voltage is applied through the switch contacts and the inflate control circuit to the seat lumbar adjuster valve assembly. In response to this signal, the lumbar adjuster valve assembly energizes its internal inflate solenoid and applies battery voltage through the seat lumbar support pump control circuit to the pump. The pump runs to inflate the appropriate lumbar bladder until the switch is released. When the switch is pressed to deflate the lumbar support, battery voltage is applied through the switch contacts and the deflate signal circuit to the lumbar adjuster valve assembly. The lumbar adjuster valve assembly energizes its internal deflate solenoid and air is released from the bladder until the switch is released.

Reference Information

Schematic Reference

1. «Driver Seat Schematics»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
2. «Passenger Seat Schematics»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Lumbar Support Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Circuit/System Verification

1. Ignition ON, press and hold the S65 seat lumbar support switch in the FORWARD direction. The A14 lumbar support pump should run and the upper and lower lumbar support bladders should inflate until the bladders are 100% inflated or the switch is released.
2. Press the S65 lumbar support switch in the REARWARD direction. The upper and lower lumbar support bladders should deflate until the bladders are 100% deflated or the switch is released.
3. Press the S65 lumbar support switch in the UP direction. The A14 lumbar support pump should run and the upper lumbar support bladder should inflate until the bladder is 100% inflated or switch is released.
4. Press and hold the S65 lumbar support switch in the DOWN direction. The upper lumbar bladder should start to deflate while the lower lumbar bladder inflates until the upper lumbar is 100% deflated and the lower lumbar is 100% inflated or the switch is released.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate S65 seat lumbar support switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the harness connector at the S65 seat lumbar support switch and disconnect the harness connector at the Q51 seat lumbar adjuster valve assembly.
4. Test for less than 5 ohms between the ground circuit terminal 5 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
5. Connect a test lamp between the signal circuit terminals listed below and ground: Lumbar up switch signal terminal 1 Lumbar rearward switch signal terminal 2 Lumbar down switch signal terminal 3 Lumbar forward switch signal terminal 4
6. Ignition ON, press and release the S65 seat lumbar support switch in the appropriate direction. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the S65 seat lumbar support switch. If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S65 seat lumbar support switch.
7. Ignition OFF, connect the harness connector at the Q51 seat lumbar adjuster valve assembly and disconnect the harness connector at the A14 lumbar support pump.
8. Test for less than 5 ohms between the ground circuit terminal 3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
9. Connect a test lamp between the control circuit terminal 1 and ground.
10. Ignition ON, command the A14 lumbar support pump ON and OFF by pressing and releasing the lumbar support switch in either the UP or FORWARD direction. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the Q51 seat lumbar adjuster valve assembly. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the Q51 seat lumbar adjuster valve assembly.
11. If all circuits test normal, test or replace the A14 lumbar support pump.

Component Testing

Lumbar Support Switch

1. Ignition OFF, disconnect the harness connector at the appropriate S65 seat lumbar support switch.
2. Test for infinite resistance between the B+ terminal G and each signal terminal with the switch in the open position. If not the specified value, replace the S65 seat lumbar support switch.
3. Test for less than 1 ohms between the B+ terminal G and each signal terminal with the appropriate switch in the closed position. If greater than the specified range, replace the S65 seat lumbar support switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Driver or Passenger Seat Lumbar Control Switch Replacement (Driver/Passenger Seat 6-Way Hybrid)

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The driver seat without memory and the passenger seat are completely controlled through their respective seat adjuster switch. Battery voltage is supplied at all times to the seat switch through a 25 A circuit breaker located in the instrument panel fuse block. When the seat switches are in an inactive state, the switch contacts are closed to the switch ground circuit.

All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, B+ is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. With the horizontal motor rearward switch contacts closed to the switch ground circuit, the motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.

Schematic Reference

1. «Driver Seat Schematics»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
2. «Passenger Seat Schematics»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Seats System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

1. If the inoperative seat is the passenger 2-way power seat, refer to the 2-way Power Seat Circuit Testing in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system) .
2. Operate the appropriate driver or passenger seat switches for the seat directional motors listed below in both directions. The seat should move in the commanded direction. M51 Horizontal Motor M50 Front Vertical Motor M55 Rear Vertical Motor M56 Recline Motor

1. If the power seat is inoperative in all directions, refer to the S64 Seat Adjuster Switch Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system) .
2. If 1 or more of the seat adjuster motors operate, refer to the Seat Motor Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system) .

2-Way Power Seat Circuit Test

1. Ignition OFF, disconnect the harness connector at the S64P passenger seat adjuster switch.
2. Test for less than 5.0 ohms between the ground circuit terminals listed below and ground: Terminal A Terminal C If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the harness connector at the S64P seat adjuster switch and disconnect the harness connector at the M55P passenger seat vertical motor.
5. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5.
6. Ignition ON, command the seat motor in both directions using the S64P seat adjuster switch. The test lamp should turn ON when commanding the motor in both directions. If the test lamp remains OFF during either of the commands, test both control circuits for a short to ground or an open/high resistance. If the circuits tests normal, test or replace the S64P seat adjuster switch.
7. If all circuits test normal, test or replace the M55P passenger seat vertical motor.

S64 Seat Adjuster Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate S64 seat adjuster switch.
2. Test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, test or replace the S64 seat adjuster switch.

Seat Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below: M50 seat front vertical motor M55 seat rear vertical motor M51 seat horizontal motor M56 seat recline motor
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5.
3. Ignition ON, command the seat motor Up and Down or Forward and Rearward using the seat switch. The test lamp should turn ON when commanding the up and down or forward and rearward states. If the test lamp remains OFF for either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the S64 seat adjuster switch.
4. If all circuits test normal, test or replace the seat motor.

Seat Adjuster Switch Test (2-Way)

1. Ignition OFF, disconnect the harness connector at the S64P passenger seat adjuster switch.
2. Test for less than 1 ohms between the B+ terminal D and each control terminal with the appropriate switch in the open position. If greater than the specified range, replace the S64P seat adjuster switch.
3. Test for infinite resistance between terminal A and terminal E with the switch in the open position. If less than the specified value, replace the S64P seat adjuster switch.
4. Test for infinite resistance between terminal C and terminal B with the switch in the open position. If less than the specified value, replace the S64P seat adjuster switch.
5. Test for less than 1 ohms between terminal A and terminal E with the appropriate switch in the closed position. If greater than the specified range, replace the S64P seat adjuster switch.
6. Test for less than 1 ohms between terminal C and terminal B with the appropriate switch in the closed position. If greater than the specified range, replace the S64P seat adjuster switch.

Seat Adjuster Switch Test (8-Way)

1. Ignition OFF, disconnect the harness connector at the S64 seat adjuster switch.
2. Test for less than 1 ohms between the ground terminal B and each control terminal with the appropriate switch in the open position. If greater than the specified range, replace the S64 seat adjuster switch.
3. Test for infinite resistance between the B+ terminal B and each control terminal with the switch in the open position. If less than the specified value, replace the S64 seat adjuster switch.
4. Test for less than 1 ohms between the B+ terminal E and each control terminal with the appropriate switch in the closed position. If greater than the specified range, replace the S64 seat adjuster switch.

Seat Motor

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below: M50 seat front vertical motor M55 seat rear vertical motor M51 seat horizontal motor M56 seat recline motor
2. Install a 30 A fused jumper wire between control terminal 1 and 12 V. Momentarily install a jumper wire between control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/REARWARD/UP/DOWN function. If the function does not perform as specified, replace the seat motor.
3. Reverse the polarity of jumper wires. The a seat motor should perform in the opposite direction. If the function does not perform as specified, replace the seat motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Driver or Passenger Seat Adjuster Switch Replacement (Driver/Passenger Seat 4-Way Hybrid)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
2. «Front Seat Tilt Adjuster Actuator Replacement (Driver/Passenger Seat 6-Way Hybrid)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system) , «Front Seat Tilt Adjuster Actuator Replacement (Driver/Passenger Seat 8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
3. «Driver or Passenger Seat Vertical Adjuster Actuator Replacement (4/6/8-Way)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
4. «Front Seat Adjuster Actuator Replacement (8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
5. «Front Seat Adjuster Motor Replacement (Driver or Passenger Seat 8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)
6. «Front Seat Recliner Actuator Motor Replacement (Driver or Passenger Seat 8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system)

Scheme 63

Driver or Passenger Seat Adjuster Switch Replacement (Driver/Passenger Seat 4-Way Hybrid)

Scheme 64

Front Seat Tilt Adjuster Actuator Replacement (Driver/Passenger Seat 6-Way Hybrid)

Scheme 65

Front Seat Tilt Adjuster Actuator Replacement (Driver/Passenger Seat 8-Way Power)

Scheme 66

Front Seat Recliner Actuator Shaft Replacement (Lower - 8-Way-Power)

Scheme 67

Driver or Passenger Seat Vertical Adjuster Actuator Replacement (4/6/8-Way)

Scheme 68

Front Seat Adjuster Actuator Replacement (8-Way Power)

Scheme 69

Front Seat Adjuster Motor Replacement (Driver or Passenger Seat 8-Way Power)

Scheme 70

Driver or Passenger Seat Lumbar Control Switch Replacement (Driver/Passenger Seat 6-Way Hybrid)

Scheme 71

Front Seat Recliner Actuator Motor Replacement (Driver or Passenger Seat 8-Way Power)

Lumbar Support Components

The driver and front passenger pneumatic lumbar support system consists of the following components

1. Seat Lumbar support switch
2. Seat lumbar adjuster valve assembly
3. Seat lumbar support pump

Circuit Description

Battery voltage is supplied at all times to the driver and passenger seat lumbar support switches through 15 A fuses located in the underhood fuse block. When a lumbar switch is pressed to inflate the lumbar support, battery voltage is applied through the switch contacts and the inflate control circuit to the seat lumbar adjuster valve assembly. In response to this signal, the lumbar adjuster valve assembly energizes its internal inflate solenoid and applies battery voltage through the seat lumbar support pump control circuit to the pump. The pump runs to inflate the appropriate lumbar bladder until the switch is released. When the switch is pressed to deflate the lumbar support, battery voltage is applied through the switch contacts and the deflate signal circuit to the lumbar adjuster valve assembly. The lumbar adjuster valve assembly energizes its internal deflate solenoid and air is released from the bladder until the switch is released.

Description of Operation

The following describes the lumbar support operation and how the lumbar adjuster valve assembly responds to each of the lumbar support switch inputs

1. When the lumbar support switch pressed in the FORWARD direction, the lumbar adjuster valve assembly will command the lumbar support pump ON and the upper and lower lumbar support bladders should inflate until the bladders are 100% inflated or the switch is released.
2. When pressing the lumbar support switch in the REARWARD direction, the lumbar adjuster valve assembly will slowly deflate the upper and lower lumbar support bladders until the switch is released or both bladders are 100% deflated.
3. When the lumbar support switch is pressed in the UP direction, the lumbar adjuster valve assembly will slowly inflate the upper lumbar support bladder until the switch is released or the bladder is 100% inflated.
4. When the lumbar support switch is pressed in the DOWN direction, the lumbar adjuster valve assembly will slowly deflate the upper lumbar bladder while it inflates the lower lumbar bladder. The lumbar adjuster valve assembly will continue this operation until the switch is released or the upper lumbar bladder is 100% deflated and the lower lumbar bladder is 100% inflated.

Power Seats System Description and Operation

The driver and passenger power seat systems each consist of the following components

1. Seat adjuster switch
2. Seat horizontal motor
3. Seat front vertical motor
4. Seat rear vertical motor
5. Seat back recline motor
6. 25 A circuit breaker

Seat Switch

The seat switches provide both power and ground to the selected seat motors. Battery positive voltage is supplied at all times to the driver and passenger seat switches through a 25 A circuit breaker located in the instrument panel fuse block. Ground for the driver seat switch is provided at G305 while ground for the passenger seat switch is provided at G302.

Seat Motors

All of the seat motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit. There are four seat position motors and one lumbar motor. These are the horizontal motor, front vertical motor, rear vertical motor, and the seat back recline motor. The seat horizontal motor moves the entire seat forward and rearward. The seat vertical motors may operate independently to tilt the front or rear of the seat cushion up or down. Both motors can also run simultaneously to move the entire seat up or down. The recline motor moves the angle of the seat back forward or rearward.

Seat Operation

All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, ground is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. With the horizontal motor rearward switch contacts closed to the switch B+ circuit, the motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.

See also:
• Checking Aftermarket Accessories
• Testing for Intermittent Conditions and Poor Connections
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Circuit Testing
• Connector Repairs
• Wiring Repairs
• Diagnostic Repair Verification
• Driver or Passenger Seat Adjuster Finish Cover Replacement (8-Way-Power)
• Fastener Caution
• Battery Negative Cable Disconnection and Connection
• SIR Disabling and Enabling
• Lumbar Support Description and Operation
• Power Seats System Description and Operation