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Home >> Buick >> 2020 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 193 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC B172E or B172F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  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 
    5. 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
    • Go to next step: If between 21 and 57 ohms 
  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.
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