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HOMESERVICE MANUALSBUICK2019CASCADA BASEREPAIR AND DIAGNOSISELECTRICALCHARGING SYSTEMSBATTERY, CHARGING SYSTEM AND STARTING SYSTEMREPAIR INSTRUCTIONSENGINE CONTROL MODULE WIRING HARNESS REPLACEMENTREMOVAL PROCEDURE
2019 Buick Cascada Base

Removal Procedure

2019 Buick Cascada BaseSECTION Removal Procedure
  1. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection .
  2. Remove the engine sight shield. Refer to Engine Sight Shield Replacement .
  3. GM2888716Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 3 engine control module wiring harness plugs (2).

  4. Disconnect the 3 heated oxygen sensor wiring harness plugs (2) and unclip the wiring harness plug from the bracket.
  5. Unclip the 2 wiring harness retainers (3).
  6. Remove the battery tray. Refer to Battery Tray Replacement .
  7. Remove the front compartment fuse block. Refer to Front Compartment Fuse Block Replacement .
  8. GM2506210Courtesy of GENERAL MOTORS COMPANY

    Remove the wiring harness ground cable nut (2) and remove the wiring harness ground cable (3).

  9. Remove the wiring harness plug (1) in top direction from the front compartment fuse block housing.
  10. Disconnect the wiring harness connection adapter plug (4).
  11. GM2888730Courtesy of GENERAL MOTORS COMPANY

    For manual transmission, disconnect the backup lamp switch wiring harness plug (3).

  12. If equipped for manual transmission, disconnect the neutral gear sensor wiring harness plug (2).
  13. Unclip the 2 wiring harness retainers (1).
  14. GM2888731Courtesy of GENERAL MOTORS COMPANY

    For automatic transmission, disconnect the transmission control module wiring harness plug (2).

  15. Unclip the wiring harness retainer (1).
  16. GM2888732Courtesy of GENERAL MOTORS COMPANY

    Unclip the coolant hose (3) from the charge air cooler outlet air hose retainer.

  17. Loosen the clamp (1).
  18. Remove the charge air cooler outlet air hose (2) from the throttle body adapter. Hang the hose aside.
  19. GM2888733Courtesy of GENERAL MOTORS COMPANY

    Disconnect the fuel injection wiring harness plug (3).

  20. Disconnect the exhaust camshaft position sensor wiring harness plug (1).
  21. Disconnect the intake camshaft position sensor wiring harness plug (5).
  22. Disconnect the engine coolant temperature wiring harness plug (6).
  23. Remove the engine wiring harness ground cable bolt (6) and the ground cable (7).
  24. Unclip the 2 wiring harness retainers (2, 4).
  25. GM2888734Courtesy of GENERAL MOTORS COMPANY

    Disconnect the fuel pump wiring harness plug (5).

  26. Disconnect the intake air pressure/temperature sensor wiring harness plug (1).
  27. Disconnect the throttle body wiring harness plug (3).
  28. Unclip the 3 wiring harness retainers (2, 4).
  29. GM2888735Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 4 ignition coil wiring harness plugs (2).

  30. Unclip the 2 wiring harness retainers (1).
  31. GM2888736Courtesy of GENERAL MOTORS COMPANY

    Disconnect the engine oil pressure wiring harness plug (3).

  32. Disconnect the intake camshaft actuator solenoid valve wiring harness plug (5).
  33. Disconnect the evaporative emission canister purge solenoid valve wiring harness plug (1).
  34. Unclip the 3 wiring harness retainers (2, 4).
  35. GM2888746Courtesy of GENERAL MOTORS COMPANY

    Disconnect the mass air flow sensor wiring harness plug (1).

  36. Unclip the 3 wiring harness retainers (2).
  37. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  38. GM2888747Courtesy of GENERAL MOTORS COMPANY

    Disconnect the exhaust camshaft position actuator solenoid valve wiring harness plug (2).

  39. Disconnect the turbocharger wastegate regulator solenoid valve wiring harness plug (3).
  40. Disconnect the engine coolant thermostat wiring harness plug (4).
  41. Unclip the 4 wiring harness retainers (1, 5).
  42. Raise and support the vehicle. Lifting and Jacking the Vehicle .
  43. GM2888748Courtesy of GENERAL MOTORS COMPANY

    Disconnect the charge air bypass valve wiring harness plug (2).

  44. Disconnect the knock sensor wiring harness plug (3).
  45. Disconnect the oil pump flow wiring harness plug (5).
  46. Disconnect the heated oxygen sensor wiring harness plug (4).
  47. Disconnect the generator wiring harness plug (6).
  48. Disconnect the starter wiring harness plug (8).
  49. Disconnect the crankshaft position sensor wiring harness plug (10).
  50. Disconnect the engine oil level sensor wiring harness plug (9).
  51. Disconnect the heater inlet pump wiring harness plug (1).
  52. Unclip the 5 wiring harness retainers (4).
  53. GM2888749Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 2 AC compressor wiring harness plugs (1, 2).

  54. Lower the vehicle.
  55. Remove the engine control module wiring harness from the vehicle.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.