Buick Regal: Seat Haptic Signal Motor Malfunction

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC B172E

Driver Seat Cushion Left Rear Haptic Movement

DTC B172F

Driver Seat Cushion Right Rear Haptic Movement

Symptom Byte Information: Symptom Byte List.

Diagnostic Fault Information

Circuit/System Description

For an overview of the component/system, refer to: Safety Alert Seat Description and Operation.

Conditions for Running the DTC

Ignition On

Conditions for Setting the DTC

B172E 01

Control module K40D detects: Left Rear Seat Haptic Movement Motor Control = Short to Voltage

B172E 02

Control module K40D detects: Left Rear Seat Haptic Movement Motor Control = Short to Ground

B172F 01

Control module K40D detects: Right Rear Seat Haptic Movement Motor Control = Short to Voltage

B172F 02

Control module K40D detects: Right Rear Seat Haptic Movement Motor Control = Short to Ground

Actions Taken When the DTC Sets

• Seat Cushion Haptic Motors = Inoperative
• Driver Information Center Display - Service Driver Assist

Conditions for Clearing the DTC

The conditions for setting the DTC no longer exist.

Diagnostic Aids

Verify the function: Seat Cushion Haptic Motors Disabled by Driver Personalization

Reference Information

Schematic Reference

Driver Assistance Systems Wiring Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Safety Alert Seat 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

Circuit/System Verification

1. Ignition - On/Vehicle - In Service Mode.

2. Perform the scan tool function: Driver Seat Cushion Left Rear Haptic Movement & Driver Seat Cushion Right Rear Haptic Movement - On and Off.

Verify the component produces a vibration that can be heard and felt.

• If the component does not activate

Refer to: Circuit/System Testing

• Go to next step: If the component activates

3. All OK.

Circuit/System Testing

1. Ignition/Vehicle & All vehicle systems - Off.

2. Disconnect the electrical connector: X5 @ K40D Seat Memory Control Module - Driver.

3. Ignition - On/Vehicle - In Service Mode.

4. Test for less than 1 V between the test points:

• Control circuit terminal 4 & Ground
• Control circuit terminal 5 & Ground
• If 1 V or greater

Repair the short to voltage on the circuit.

• Go to next step: If less than 1 V

NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

5. Ignition/Vehicle & All vehicle systems - Off.

6. Test for 27 to 51 ohms between the test points:

• Control circuit terminal 4 & Ground
• Control circuit terminal 5 & Ground
• If less than 27 ohms

Replace the appropriate component: P45LR Seat Haptic Movement Motor - Driver Left Rear or P45RR Seat Haptic Movement Motor - Driver Right Rear

• If greater than 51 ohms

1. Test or inspect for the following: Ground Connection - Clean & Secure
   • If not correct

   Repair as necessary

• Go to next step: If correct

2. Replace the appropriate component: P45LR Seat Haptic Movement Motor - Driver Left Rear or P45RR Seat Haptic Movement Motor - Driver Right Rear

7. Momentarily connect a 3 A fused jumper wire between the test points:

• Control circuit terminal 4 & B+
• Control circuit terminal 5 & B+

8. Verify the component turns On and Off when connecting and disconnecting the jumper wire: P45LR Seat Haptic Movement Motor - Driver Left Rear or P45RR Seat Haptic Movement Motor - Driver Right Rear

• If the component does not turn On and Off

Replace the appropriate component: P45LR Seat Haptic Movement Motor - Driver Left Rear or P45RR Seat Haptic Movement Motor - Driver Right Rear

• Go to next step: If the component turns On and Off

9. Ignition/Vehicle & All vehicle systems - Off.

10. Connect the electrical connector at all components.

11. Ignition - On/Vehicle - In Service Mode.

12. Perform the scan tool function: Driver Seat Cushion Left Rear Haptic Movement & Driver Seat Cushion Right Rear Haptic Movement - On and Off.

Verify the component produces a vibration that can be heard and felt.

• If the component does not activate

Replace the appropriate component: K40D Seat Memory Control Module - Driver

• Go to next step: If the component activates

13. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

• Remove Front Seat Lane Departure Warning Actuator - P45LR Seat Haptic Movement Motor - Driver Left Rear or P45RR Seat Haptic Movement Motor - Driver Right Rear
• For control module replacement, programming, and setup refer to: Control Module References

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