Seat Heating System and Seat Cooling System Buick Regal V

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 54

Scheme 55

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

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

The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat heating element. The seat heating control module supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground through the low reference circuit to the sensor. The module monitors the voltage of the sensor signal circuit to determine the temperature of the seat. The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat reaches the set temperature, the module will then cycle the control circuit of the heating elements ON and OFF in order to maintain the desired seat temperature based on the feedback voltage from the sensor.

Conditions for Running the DTC

1. DTC B1325 must not be present.
2. The seat heating control module must be powered.

Conditions for Setting the DTC

B1925 02 or B2170 02

The temperature sensor voltage drops below 0.6 V for more than 1 second.

B1925 05 or B2170 05

The temperature sensor voltage is greater than 5 V for more than 1 second.

Action Taken When the DTC Sets

The heated seat function for the affected seat will be disabled.

Conditions for Clearing the DTC

1. The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to normal operating range and the ignition is cycled OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate E14B or E14D seat cushion heating element.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the K29 seat heating control module.
3. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 2 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K29 seat heating control module. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K29 seat heating control module.
4. If all circuits test normal, test or replace the E14 seat cushion heating element.

Component Testing

E14B or E14D Seat Cushion Heating Element

1. Ignition OFF, disconnect the harness connector at the appropriate E14B or E14D seat cushion heating element.
2. Test for 500 ohms - 300 kohms between the signal circuit terminal 2 and the low reference circuit terminal 1. If not within the specified range, replace the E14 seat cushion heating element.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Driver or Passenger Seat Cushion Heater Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system)
2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for seat heating control module replacement, setup, and programming

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 seat heating control module controls seat heating operation for the driver and front passenger seats. The heating elements are controlled through individual high side and low side control circuits. The low side control circuits for both seats are connected to a common reference point internal to the module. This reference point is biased to approximately 2.5 V. Before the seat heating control module will allow heated seat operation, it checks to see if this biased voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

1. Engine must be running.
2. The seat heating control module must be powered.

B2345 13

Any temperature sensor input that remains below 1.5 V for more than 1 second.

The heated seat function for both seats will be disabled.

1. The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to the normal operating range and the ignition is cycled OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the X2, X3 harness connectors at the K29 seat heating control module.
2. Test for greater than 3.0 kohms between the signal and the low reference circuit terminals listed below: Driver seat cushion terminal 3 X3 and terminal 13 X2 Passenger seat cushion terminal 4 X3 and terminal 14 X2 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate E14 seat cushion heating element.
3. If all circuits test normal, replace the K29 seat heating control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Driver or Passenger Seat Cushion Heater Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system)
2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for K29 seat heating control module replacement, setup and programming

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 and front passenger heated seats are controlled by the seat heating control module that is located under the driver seat cushion. When the heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.

1. DTC B1325 must not be present.
2. Engine must be running.
3. The seat heating control module must be powered and the heated seat must be enabled.

B2425 0D or B2430 0D

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is above the maximum resistance.

B2425 0B, B2425 0E, B2430 0B, or B2430 0E

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is below the minimum resistance.

The heated seat function for the affected seat will be disabled.

1. The current DTC clears when the malfunction is no longer present, and the power mode changes to OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

B2425 0B, B2425 0D, or B2425 0E

1. Ignition OFF, disconnect the harness connector at the E14B seat cushion heating element.
2. Test for 0.78 - 1.57 ohms between terminal 3 and terminal 4. If not within the specified range, replace the E14B seat cushion heating element.
3. Connect the harness connector at the E14B seat cushion heating element and disconnect the X2 harness connector at the E14A seat back heating element.
4. Test for 0.54 - 1.09 ohms between terminal 2 and terminal 3. If not within the specified range, replace the E14A seat back heating element.
5. Connect the harness connector at the E14A seat back heating element and disconnect the X2 harness connector at the K29 seat heating control module.
6. Test for 0.93 - 3.56 ohms between control circuit terminal 1 and control circuit terminal 3. If less than the specified range, test for a short between the control circuits. If greater than the specified range, test the control circuits for an open/high resistance.
7. If all circuits test normal, replace the K29 seat heating control module.

B2430 0B, B2430 0D, or B2430 0E

1. Ignition OFF, disconnect the harness connector at the E14D seat cushion heating element.
2. Test for 0.78 - 1.57 ohms between terminal 3 and terminal 4. If not within the specified range, replace the E14D seat cushion heating element.
3. Connect the harness connector at the E14D seat cushion heating element and disconnect the X2 harness connector at the E14C seat back heating element.
4. Test for 0.54 - 1.09 ohms between terminal 2 and terminal 3. If not within the specified range, replace the E14C seat back heating element.
5. Connect the harness connector at the E14C seat back heating element and disconnect the X2 harness connector at the K29 seat heating control module.
6. Test for 0.93 - 3.80 ohms between control circuit terminal 2 and control circuit terminal 5. If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14D seat cushion heating element. If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element.
7. If all circuits test normal, replace the K29 seat heating control module.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Cushion Heater Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system)
2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for seat heating control module replacement, setup, and programming

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 and front passenger heated seats are controlled by the seat heating control module that is located under the driver seat cushion. When the heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.

1. DTC B1325 must not be present.
2. Engine must be running.
3. The seat heating control module must be powered and the heated seat must be enabled.

B2425 0D or B2430 0D

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is above the maximum resistance.

B2425 0B, B2425 0E, B2430 0B, or B2430 0E

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is below the minimum resistance.

The heated seat function for the affected seat will be disabled.

1. The current DTC clears when the malfunction is no longer present, and the power mode changes to OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

B2425 0B, B2425 0D, or B2425 0E

1. Ignition OFF, disconnect the harness connector at the E14B seat cushion heating element.
2. Test for 0.75 - 1.98 ohms between terminal 3 and terminal 4. If not within the specified range, replace the E14B seat cushion heating element.
3. Connect the harness connector at the E14B seat cushion heating element and disconnect the X2 harness connector at the E14A seat back heating element.
4. Test for 0.41 - 1.10 ohms between terminal 2 and terminal 3. If not within the specified range, replace the E14A seat back heating element.
5. Connect the harness connector at the E14A seat back heating element and disconnect the X2 harness connector at the K29 seat heating control module.
6. Test for 1.09 - 3.73 ohms between control circuit terminal 1 and control circuit terminal 3. If less than the specified range, test for a short between the control circuits. If greater than the specified range, test the control circuits for an open/high resistance.
7. If all circuits test normal, replace the K29 seat heating control module.

B2430 0B, B2430 0D, or B2430 0E

1. Ignition OFF, disconnect the harness connector at the E14D seat cushion heating element.
2. Test for 0.75 - 1.98 ohms between terminal 3 and terminal 4. If not within the specified range, replace the E14D seat cushion heating element.
3. Connect the harness connector at the E14D seat cushion heating element and disconnect the X2 harness connector at the E14C seat back heating element.
4. Test for 0.41 - 1.10 ohms between terminal 2 and terminal 3. If not within the specified range, replace the E14C seat back heating element.
5. Connect the harness connector at the E14C seat back heating element and disconnect the X2 harness connector at the K29 seat heating control module.
6. Test for 1.09 - 3.96 ohms between control circuit terminal 2 and control circuit terminal 5. If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14D seat cushion heating element. If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element.
7. If all circuits test normal, replace the K29 seat heating control module.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Driver or Passenger Seat Cushion Heater Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system)
2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for seat heating control module replacement, setup, and programming

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 seat heating control module controls the seat heating operation for both the driver and front passenger seats. The module controls the heating elements through individual high side and low side control circuits. The low side control circuits for both seats are connected to a common reference point internal to the module. This reference point is biased to approximately 2.5 V. Before the seat heating control module will allow heated seat operation, it checks to see if this biased voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

1. DTC B1325 must not be present.
2. The seat heating control module must be powered.

B242A 01

The seat heating control module detects a short to voltage on the heater element control circuits.

B242A 02

The seat heating control module detects a short to ground on the heater element control circuits.

The heated seat function for both seats will be disabled.

1. The current DTC will clear and set a history code 3 seconds after the reference voltage returns to normal operating range and the ignition is cycled OFF then back to ACC or RUN.
2. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the X2 harness connector at the K29 seat heating control module.
2. Test for infinite resistance between the control circuit terminal 3 and ground. If not the specified value, test the control circuit for a short to ground.
3. Test for infinite resistance between the control circuit terminal 5 and ground. If not the specified value, test the control circuit for a short to ground.
4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
5. Verify that a test lamp does not illuminate between the control circuit terminal 5 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
6. If all circuits test normal, replace the K29 seat heating control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for seat heating control module replacement, setup, and programming

Symptoms - Seat Heating and Cooling

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

1. When diagnosing a heated seat system condition perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) , before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Heated Seats Description and Operation»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the power seats. 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 seat adjuster track for conditions which may cause binding or objects within the seat adjustment range which obstruct movement or interfere with wiring.

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 the Front Heated Seat Malfunction diagnostic procedure in order to diagnose the symptom.

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 and passenger heated seats are controlled by separate heated seat switches that are located in the HVAC control. When a heated seat switch is pressed, a serial data message is sent from the HVAC control to the HVAC control module indicating the heated seat command. The HVAC control module then serves as a gateway to transmit the message to the seat heating control module via the serial data line. In response to this message, the seat heating control module applies battery positive voltage through the element supply voltage circuit to the appropriate seat heating elements. The seat heating control module then sends a serial data message back to the HVAC control module to gateway the information to the HVAC control to either illuminate or turn off the appropriate temperature indicator.

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Heated Seats 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)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine ON, observe the scan tool Driver Seat Heating/Venting/Cooling Mode parameter while pressing the driver HEATED seat switch. The reading should change between Off and Back & Cushion Heat. If not the specified value, replace the A26 HVAC control.
2. Observe the scan tool Passenger Seat Heating/Venting/Cooling Mode parameter while pressing the passenger HEATED seat switch. The reading should change between Off and Back & Cushion Heat. If not the specified value, replace the A26 HVAC control.
3. If all scan tool parameter readings are normal, there are no DTCs set, and the driver and/or passenger heated seat is inoperative, replace the K29 seat heating control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heater and Air Conditioning Control Replacement»(/buick/regal/v-2009-2013/remont/automatic-hvac-system/#hvac-system-automatic)
2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for seat heating control module replacement, setup, and programming

Scheme 56

Front Seat Heater Control Module Replacement (Base)

Removal Procedure

1. Disable the SIR System. Refer to «SIR Disabling and Enabling»(/buick/regal/v-2009-2013/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Remove the driver or passenger seat. Refer to «Driver or Passenger Seat Replacement (Oshawa 2/4/6-Way Hybrid, 6-Way Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
3. Remove the front seat outer adjuster finish cover. Refer to «Driver or Passenger Seat Outer Adjuster Finish Cover Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Outer Adjuster Finish Cover Replacement (8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
4. Remove the driver or passenger seat recliner lever. Refer to «Driver or Passenger Seat Recliner Lever Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
5. Remove the tilt adjuster lever. Refer to «Front Seat Tilt Adjuster Lever Replacement (Driver or Passenger Seat 6-Way Hybrid)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
6. Remove the driver or passenger seat adjuster finish cover. Refer to «Driver or Passenger Seat Adjuster Finish Cover Replacement (8-Way-Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Adjuster Finish Cover Replacement (4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
7. Remove the driver or passenger seat inner recliner finish cover. Refer to «Driver or Passenger Seat Inner Recliner Finish Cover Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
8. Remove the driver or passenger seat head restraint. Refer to «Driver or Passenger Seat Head Restraint Replacement (without AHS)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
9. Remove the front seat head restraint guide bezel. Refer to «Front Seat Head Restraint Guide Bezel Replacement (8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Front Seat Head Restraint Guide Bezel Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
10. Remove the front seat head restraint adjust rod guide. Refer to «Front Seat Head Restraint Adjust Rod Guide Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
11. Clip out securing (1) of recliner control shaft (2).
12. Remove the recliner control (1) from the recliner shaft (2). Unhinge the cushion strap (3) at seat frame.
13. Loosen the front seat back cushion at backrest left side (1) and right side (2).
14. Clip out the front seat back cushion vent fan mat (3) of vent fan (4). Pull the cushion (5) in front to surface.
15. Loosen both nuts (1, 2) from the seat side inflatable restraint module (3).
16. Disconnect the wiring harness connector (2) from the seat side inflatable restraint module (1).
17. Disconnect the wiring harness connector (1) of the seat back cushion heater.
18. Remove the front seat back cushion with cushion pad (1) from the backrest frame (2).
19. Remove the seat side inflatable restraint module (1) out of the textile straps (2).
20. Remove the hog rings from the under side of the seat cushion (1), pull the cushion cover off of the pad (2).
21. Install the seat side inflatable restraint module (1) at cushion cover with the textile straps (2).
22. Label the position of the seat back cushion heater (1) with marker.
23. Remove the seat back cushion heater (1) from the seat back cushion pad (2).
24. Install seat back cushion heater (1) at cushion pad: Remove the foil from the new seat back cushion heater mat, and install the seat back cushion heater at cushion pad. Proof the correct position and gluing of the seat back cushion heater.
25. Install the front seat cushion cover (1) at the cushion pad (2) with hog rings.
26. Install the seat side inflatable restraint module (1) at cushion cover with the textile straps (2).
27. Install the front seat back cushion with cushion pad (1) at the backrest frame (2).
28. Connect the wiring harness connector (1) of the seat back cushion heater.
29. Connect the wiring harness connector (2) from seat side inflatable restraint module (1).
30. Position the seat side inflatable restraint module (3) the backrest frame. Screw both nuts (1, 2) from seat side inflatable restraint module (3) and tighten to 3.25 N.m (29 lb in).
31. Clip in the front seat back cushion vent fan mat (3) at the vent fan (4). Position the cushion (5).
32. Install the front seat back cushion at backrest left side (1) and right side (2).
33. Install the front seat head restraint adjust rod guide. Refer to «Front Seat Head Restraint Adjust Rod Guide Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
34. Install the front seat head restraint guide bezel. Refer to «Front Seat Head Restraint Guide Bezel Replacement (8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Front Seat Head Restraint Guide Bezel Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
35. Install the front seat head restraint. Refer to «Driver or Passenger Seat Head Restraint Replacement (without AHS)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
36. Close the cushion at backrest rear side.
37. Install the driver or passenger seat inner recliner finish cover. Refer to «Driver or Passenger Seat Inner Recliner Finish Cover Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
38. Install the driver or passenger seat adjuster finish cover. Refer to «Driver or Passenger Seat Adjuster Finish Cover Replacement (8-Way-Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Adjuster Finish Cover Replacement (4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
39. Install the tilt adjuster lever. Refer to «Front Seat Tilt Adjuster Lever Replacement (Driver or Passenger Seat 6-Way Hybrid)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
40. Install the driver or passenger seat recliner lever. Refer to «Driver or Passenger Seat Recliner Lever Replacement»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
41. Install the front seat outer adjuster finish cover. Refer to «Driver or Passenger Seat Outer Adjuster Finish Cover Replacement (2/4/6-Way Hybrid, 6-Way Hybrid Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) , «Driver or Passenger Seat Outer Adjuster Finish Cover Replacement (8-Way Power)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
42. Remove the driver or passenger seat. Refer to «Driver or Passenger Seat Replacement (Oshawa 2/4/6-Way Hybrid, 6-Way Sport)»(/buick/regal/v-2009-2013/remont/seats/#seat-hardware-seat-trim-and-upholstery) .

Scheme 57

Driver or Passenger Seat Cushion Heater Replacement

Heated Seat Components

The driver and passenger heated seats consist of the following components

1. Left heated seat switch
2. Right heated seat switch
3. HVAC control
4. Seat heating control module
5. Driver seat cushion heating element
6. Driver seat back heating element
7. Driver seat cushion temperature sensor
8. Passenger seat cushion heating element
9. Passenger seat back heating element
10. Passenger seat cushion temperature sensor

Power and Ground

Battery positive voltage is supplied at all times to the seat heating control module through a 30 A fuse located in the underhood fuse block. This voltage is used by the module to supply power to the seat heating elements. Ground for the module is provided at G307.

Heated Seat Operation

The driver and passenger heated seats are controlled by a single seat heating control module that is located under the driver seat cushion. Both heated seats are controlled by separate heated seat switches that are located in the HVAC control. When a heated seat switch is pressed, a serial data message is sent from the HVAC control to the HVAC control module indicating the heated seat command. The HVAC control module then serves as a gateway to transmit the message to the seat heating control module via the serial data line. In response to this signal, the seat heating control module applies battery positive voltage through the element supply voltage circuit to the appropriate seat heating elements. The seat heating control module then sends a serial data message back to the HVAC control module to gateway the information to the HVAC control to either illuminate or turn off the appropriate temperature indicator.

Temperature Regulation

When the engine ON, the heated seats will initialize in the OFF state. With each activation of the heated seat switch, the seat heating control module will cycle the temperature setting in the following manner: HIGH, MEDIUM, LOW, and OFF.

The seat heating control module monitors the seat temperature through the temperature sensor signal circuit and the temperature sensor (thermistor) that is located in the seat cushion. The temperature sensor is a variable resistor, it's resistance changes as the temperature of the seat changes. When the temperature sensor resistance indicates to the seat heating control module that the seat has reached the desired temperature, the module opens the ground path of the seat heating elements through the heated seat element control circuit. The module will then cycle the element control circuit open and closed in order to maintain the desired temperature.

Load Shed Management

The electrical power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high discharge condition. The heated seat system is one of the vehicle loads that is subject to reduction during a battery discharge condition. For more information on load management refer to Electrical Power Management Description and Operation .

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Checking Aftermarket Accessories
• Heater and Air Conditioning Control Replacement
• Fastener Caution
• Battery Negative Cable Disconnection and Connection
• SIR Warning
• SIR Disabling and Enabling
• Driver or Passenger Seat Replacement (Oshawa 2/4/6-Way Hybrid, 6-Way Sport)
• Driver or Passenger Seat Cushion Pad Replacement (6-Way Hybrid)
• DTC B1925 or B2170