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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (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 2018 Buick Envision. 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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