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Home >> Buick >> 2016 >> Envision >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B172E or B172F: Driver Seat Cushion Rear Haptic Alert Motor Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X5 harness connector at the K40D Seat Memory Control Module - Driver, ignition ON.
  2. Test for less than 1 V between the appropriate control circuit terminal listed below and ground:
    • P45LR Seat Haptic Movement Motor - Driver Left Rear terminal 5
    • P45RR Seat Haptic Movement Motor - Driver Right Rear terminal 4
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  4. Test for 27-51 Ω between the appropriate control circuit terminal listed below and ground:
    • P45LR Seat Haptic Movement Motor - Driver Left Rear terminal 5
    • P45RR Seat Haptic Movement Motor - Driver Right Rear terminal 4
    • If less than 27 Ω 

      Test or replace the appropriate P45 Seat Haptic Movement Motor - Driver.

    • If greater than 51 Ω 
    1. Verify the circuit ground connection is clean and secure.
      • If the ground connector is not clean or secure, repair as necessary.
      • If the circuit ground connection is clean and secure
    2. Replace the appropriate P45 Seat Haptic Movement Motor - Driver.
    • If between 27-51 Ω 
  5. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and B+.
    • P45LR Seat Haptic Movement Motor - Driver Left Rear terminal 5
    • P45RR Seat Haptic Movement Motor - Driver Right Rear terminal 4
  6. Verify the appropriate P45 Seat Haptic Movement Motor - Driver is active.
    • If the P45 Seat Haptic Movement Motor - Driver is not active 

      Replace the appropriate P45 Seat Haptic Movement Motor - Driver.

    • If the P45 Seat Haptic Movement Motor - Driver is active 
  7. Ignition OFF, connect the harness connector at the K40 Seat Memory Control Module, ignition ON.
  8. Verify the P45LR Seat Haptic Movement Motor - Driver Left Rear turns ON and OFF when commanding the Driver Seat Cushion Left Rear Haptic Movement On and Off with a scan tool.
    • If the motor does not turn ON and OFF 

      Replace the K40 Seat Memory Control Module.

    • If the motor turns ON and OFF 
  9. Verify the P45RR Seat Haptic Movement Motor - Driver Right Rear turns on and off when commanding the Driver Seat Cushion Right Rear Haptic Movement On and Off with a scan tool.
    • If the motor does not turn ON and OFF 

      Replace the K40 Seat Memory Control Module.

    • If the motor turns ON and OFF 
  10. All OK.
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