Buick Regal (2017-2022) Electric Tailgate Installation Manual

1. Points to Note

• For safety and proper use, consult a professional technician for installation. Do not attempt private disassembly or installation to avoid product damage or accidents.
• Arrange wire harnesses according to the manual, securing them to the vehicle's original wiring with cable ties. Ensure harnesses are not placed near fasteners or screw holes to prevent crushing by trim panel components.
• Before installation, check the instrument panel's function display, ensure all vehicle buttons, doors, and windows operate correctly, and inspect for any scratches on interior/exterior surfaces. Report any issues to the customer promptly.
• During disassembly and assembly, avoid carrying metal ornaments or hard objects to prevent damage to paintwork, seats, and interior. Place removed trim components carefully to avoid scratches.
• All pictures are for reference only; models with different configurations may have variations, but installation methods remain the same.
• Some wire harness terminals may not be pre-inserted. Insert terminals into connectors first to prevent short circuits after arranging harnesses, then connect other plugs.

2. Installation Tools

• Threading tools
• Quick release ratchet wrench set
• Electric drill and drill bits
• Other tools

3. Product List

• Strut: 2 pcs
• ECU: 1 set
• Wire harness: 1 set
• Lock actuator: 1 pc
• Added tailgate switch: 1 pc
• Other accessories (screws, brackets, etc.): 1 set

Installation Steps

Preparation

• Step 1: Remove indicated trim panels from the tailgate and hinges. [Image: Trim panels removed from tailgate and hinges.]
• Step 2: Remove indicated trim panels and the trunk floor mat. [Image: Trim panels and trunk floor mat removed.]
• Step 3: Remove the front left door sill panel and lift the floor mat to locate the fuse box. [Image: Front left door sill panel removed, floor mat lifted to reveal fuse box.]
• Step 4: Remove the rear left door sill panel. [Image: Rear left door sill panel removed.]
• Step 5: Remove the floor mat from the front passenger's position. [Image: Floor mat removed from front passenger seat.]
• Step 6: Remove the original tailgate lock mechanism. [Image: Original tailgate lock removed.]

Wiring and Actuator Installation

• Step 7: Connect the lock signal harness to the plugs of the lock actuator. [Image: Lock signal harness connected to lock actuator plugs.]
• Step 8: Install the lock actuator and manually lock the latch. [Image: Lock actuator installed, latch manually locked.]
• Step 9: Connect the lock signal harness to the plug of the original tailgate switch. [Image: Lock signal harness connected to original tailgate switch plug.]
• Step 10: Route the emergency wires from the trunk to the left side of the rear seats and hide them under the door sill panel. [Image: Emergency wires routed and hidden under door sill panel.]
• Step 11: Remove the bump stops from the left and right tailgate hinges. [Image: Bump stops removed from tailgate hinges.]
• Step 12: Install the right tailgate bracket. Secure it with the provided bump stop and install the U-bolt. [Image: Right tailgate bracket installed with bump stop and U-bolt.]
• Step 13: Install the left tailgate bracket. The method is the same for both sides. [Image: Left tailgate bracket installed.]
• Step 14: Remove fasteners from the trunk trim panel that connects to the trunk. Lift up both ends of the panel to allow bolts and nuts to pass through. [Image: Trunk trim panel fasteners removed, panel ends lifted.]
• Step 15: Secure a bracket first using a bolt and nut from the back side. [Image: Bracket secured with bolt and nut from the back.]
• Step 16: Thread three bolts through the bracket from the back side, secure them with nuts, and use another nut for the countersunk screw. [Image: Bolts threaded through bracket, secured with nuts.]
• Step 17: Secure another bracket first using a bolt and nut from the back side. [Image: Second bracket secured with bolt and nut from the back.]
• Step 18: Thread three bolts through the bracket from the back side, secure them with nuts, and use another nut for the countersunk screw. [Image: Bolts threaded through second bracket, secured with nuts.]
• Step 19: Install the right electric strut. The first letter of the strut number indicates left or right. [Image: Right electric strut installed.]
• Step 20: Install the right electric strut. The first letter of the strut number indicates left or right. [Image: Right electric strut installed.]

Electrical Connections

• Step 21: Route the left and right strut wire harnesses to the left side of the trunk along with the original wires. [Image: Strut wire harnesses routed to the left side of the trunk.]
• Step 22: Route the power harness. [Image: Power harness routed.]
• Step 23: Connect grounding at the indicated location. [Image: Grounding connection made.]
• Step 24: Identify the fuse slot for power supply. [Image: Fuse slot for power supply indicated.]
• Step 25: Plug the fuse tap into the fuse box, paying attention to the correct direction. [Image: Fuse tap plugged into fuse box.]
• Step 26: Thread the signal wire of the power harness to the passenger side, ensuring wires point downward. [Image: Signal wire routed to passenger side, pointing down.]
• Step 27: Lift the floor mat and find the indicated box. [Image: Floor mat lifted to reveal a box.]
• Step 28: Remove the original pink plug and insert the new signal plug into its socket. [Image: Original pink plug removed, new signal plug inserted.]
• Step 29: Place a screw on the bracket and fit the ECU into its bracket. [Image: ECU fitted into its bracket with a screw.]
• Step 30: Secure the ECU at the indicated location on the left side of the trunk. [Image: ECU secured on the left side of the trunk.]
• Step 31: Insert the left and right strut wire harnesses, lock signal harness, and power harness into the ECU in sequence. [Image: Wire harnesses connected to the ECU.]
• Step 32: Stick the hole template to the indicated location and open a hole. [Image: Hole template applied, hole opened.]
• Step 33: Connect the plug of the lock signal harness with the added tailgate switch after it is fitted into the hole. [Image: Lock signal harness plug connected to tailgate switch.]
• Step 34: Reinstall the panel on the right side of the trunk. Properly cut off any part of the panel that interferes with the strut operation. [Image: Panel reinstalled, modified to clear strut.]
• Step 35: Reinstall the panel on the right side of the trunk. Properly cut off any part of the panel that interferes with the strut operation. [Image: Panel reinstalled, modified to clear strut.]
• Step 36: Reinstall all trim panels. Open and close the tailgate once to initialize the system, then test all functions of the electric tailgate. [Image: All panels reinstalled, tailgate tested.]

5. System Initialization Method

1. Press the added tailgate switch button; the tailgate will close automatically. [? Beep]
2. Press the tailgate switch button outside the tailgate to open it; it will emit a long "beep" sound. [? Long Beep]
3. The system initialization is complete.

3. Instructions for the Added Tailgate Switch

① Closing Speed Acceleration (5 Settings)

1. Press and hold the switch button until the first short beep is heard. [? 1x Short Beep]
2. Release the button; a short beep indicates the setting has taken effect. [? Short Beep]
3. Repeat to increase the setting by one level.

② Opening Speed Acceleration (5 Settings)

1. Press and hold the switch button until the second short beep is heard. [? 2x Short Beep]
2. Release the button; two short beeps indicate the setting has taken effect. [? 2x Short Beep]
3. Repeat to increase the setting by one level.

③ Settings of the Voice Module

1. Press and hold the switch button until the third short beep is heard. [? 3x Short Beep]
2. Release the button; three short beeps indicate the voice module has entered configuration mode. (Refer to the voice module operation manual for details). [? 3x Short Beep]

④ Block the Voice Module

1. Press and hold the switch button until the fourth beep is heard. [? 4x Short Beep]
2. Release the button; four short beeps indicate the voice module has been blocked. [? 4x Short Beep]

⑤ Height Setting

1. Press and hold the switch button until the fifth short beep is heard. [? 5x Short Beep]
2. Release the button; a long beep indicates the height setting has taken effect. [? Long Beep]

⑥ Switch between quick/slow press of the unlock button on remote key

1. Press and hold the added tailgate switch button until the sixth short beep is heard. [? 6x Short Beep]
2. Release the button; a long beep and a short beep indicate the switch between quick/slow press has taken effect. [? Long Beep + Short Beep]

⑦ Switch between pressing the unlock button twice/three times

1. Press and hold the switch button until the seventh short beep is heard. [? 7x Short Beep]
2. Release the button; a long beep and two short beeps indicate the switch between double/triple press has taken effect. [? Long Beep + 2x Short Beep]

⑧ Braking force increase (5 Settings)

1. Press and hold the switch button until the eighth short beep is heard. [? 8x Short Beep]
2. Release the button; a long beep and three short beeps indicate the setting has taken effect. [? Long Beep + 3x Short Beep]

⑨ Restore to factory settings

1. Press and hold the switch button until the ninth short beep is heard. [? 9x Short Beep]
2. Release the button; a long beep and four short beeps indicate the restoration to factory settings has taken effect. [? Long Beep + 4x Short Beep]

4. Meanings of the Buzzer Sound

• "Beep" once: Receiving an open/close or pause signal; the tailgate will immediately open/close or pause. [? 1x Beep]
• "Beep" twice: The tailgate has been fully opened or closed. [? 2x Beep]
• "Beep" three times: Resistance during opening or closing is too large; intelligent anti-pinch is activated. [? 3x Beep]

6. Instructions for the Electric Tailgate

1. Methods to open and close the tailgate:

• Press the unlock button on the remote key 3 times.
• Press the unlock button at the driver's area 3 times.
• Press the original tailgate switch button.
• Press the added tailgate switch button.

2. Method to pause the tailgate:

During tailgate operation, press any of the opening/closing buttons. The tailgate will pause. Pressing again will reverse its direction.