Subframe Assembly - Rear (Remove and Install)

FRT No: 30010201

Note: Loosen suspension fasteners by hand, then use a cordless electric drill with a 3/8 in drive adapter and a 3/8 in drive air ratchet wrench.
Warning: Only technicians who have been trained in High Voltage Awareness are permitted to perform this procedure. Proper personal protective equipment (PPE) and insulating HV gloves with a minimum rating of class 00 (500V) must be worn any time a high voltage cable is handled. Refer to Tech Note TN-15-92-003, "High Voltage Awareness Care Points" for additional safety information.
Warning: If the vehicle has air suspension, activate "Jack" mode on the touchscreen before raising and supporting the vehicle.
Warning: If the 12V power supply is disconnected, do not attempt to open the front doors with door glass in closed position. Failure to follow this instruction could result in door glass shatter.
Note: Before disconnecting the 12V power supply, ensure that the driver’s door window is fully open. Failure to follow this instruction could result in vehicle lockout.

Special tool(s) required for this procedure:

Part Number Description
1082171-00-A S-hook

Remove

  1. Prepare the vehicle for lifting:
    1. Air suspension vehicles only: Put the vehicle into Jack mode.
    2. Put the vehicle into Tow mode.
    3. Support the vehicle, but do not lift it at this time.
  2. Remove the rear wheels (refer to procedure).
  3. Perform the electrical isolation procedure (refer to procedure).
  4. On both sides of the vehicle, disconnect the electric parking brake caliper harness connector.
  5. On both sides of the vehicle, pull back the rear section of the rear wheel arch liner for access.
    Note: It is not necessary to remove the wheel arch liner completely.
  6. On both sides of the vehicle, release the bolts (x2) that secure the brake caliper to the knuckle (torque 120 Nm). Release the calipers and use the S-hooks to support them.
    Caution: To avoid damage to the brake line, the brake caliper must be supported at all times.

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  7. Release the nut on the bolt that secures the shock tower to the knuckle (torque 140 Nm), but do not remove the bolt at this time.

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  8. On both sides of the vehicle, remove the nut that secures the shear plate to the subframe (torque 35 Nm).

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  9. Remove the mid aero shield (refer to procedure).
  10. Disconnect the subframe harness from the body harness at the rear left corner of the vehicle.
  11. On the RH side of the drive unit, disconnect the logic connector.
    • Large drive unit:
    • Small drive unit:
  12. Release the HV inverter cables (x2).
    • Large drive unit:
      1. Release the bolt that secures the drive inverter cover (torque 3 Nm).
      2. Remove both O-rings from the drive inverter cover and discard.
      3. Release the 2 fasteners that secure the HV cables (torque 9 Nm). Do not remove the cables at this time.
    • Small drive unit: Remove and discard the 4 screws that retain the HV cables (torque 7 Nm). Move the cables away from the drive unit and install the protective covers.
  13. On the LH side of the vehicle, clamp the coolant hose that routes through the body into the charger.

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  14. Release the clips that secure the HV cables to the subframe:
    • Large drive unit: 2 clips to the subframe
    • Small drive unit: 2 clips to the body
  15. Drain the coolant from the drive unit.
    • Large drive unit: Clamp and release the hoses from the transmission and drive inverter.
    • Small drive unit:
      1. On the LH side of the vehicle, release the edge clip that secures the coolant hose to the body.

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      2. Clamp the coolant hose that routes through the rear of the body as shown.

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      3. Release the coolant hose from the junction.
      4. On the RH side of the vehicle, clamp the coolant hose as shown.

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      5. Release the coolant hose from the junction.
  16. Release the ground strap from the drive unit (torque 16 Nm).
  17. Remove the rear skidplate (refer to procedure).
  18. Position the subframe fixture beneath the subframe.
  19. Carefully lower the vehicle and/or raise the subframe table so that the subframe table supports the subframe.
  20. Remove the bolts (x4) that secure the rear subframe to the body (torque 140 Nm).

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  21. Slowly raise the vehicle or lower the subframe lift table.
    Caution: While raising the vehicle, have an assistant monitor the underside of the vehicle. Ensure that there is no interference between any vehicle-side components and components that are secured to the subframe. Pay special attention to the following:

Install

Installation procedure is the reverse of removal, except for the following:

Caution: Only fully tighten suspension nuts and bolts when the vehicle is on a 4-post lift and the suspension is in the ride height position.
  1. Use Toolbox to recalibrate the rear doors.
  2. Perform a 4 wheel alignment (refer to procedure).