Installation Instructions for Lexus RX350 and RX450h

Part Numbers:

• 75540
• 84540
• CQT75540

Tools Required:

• Wrenches: 10mm, 12mm, 17mm, 19mm
• Ratchet
• Torque Wrench
• Flat Head Screwdriver
• Hacksaw
• Tape
• Marker
• Socket Extension

Wiring Access Location:

• Not specified in this document.

Step-by-Step Instructions:

For RX350 Models:

1. Remove Tie-Down Bracket:

   • Use a 17mm socket to remove the two bolts securing the tie-down bracket on the passenger side.
   • Return the tie-down bracket to the vehicle owner.

2. Remove Weldnut Covers:

   • Using a flat head screwdriver, remove the two plastic caps from the rearmost existing weldnuts on the driver side.
   • Remove the rearmost rubber plug from the hole between the two weldnuts.

3. Trim Lower Fascia (for models after 2021):

   • Remove two tabs from the sensor bracket behind the lower fascia, if present.
   • Mark a 3"x3" trimming area using tape and a marker, centered from the edge of the bottom tab.
   • Use a hacksaw to trim the marked area.

4. Install Hitch:

   • Raise the hitch into position over the existing weldnuts.
   • Install two M12 bolts and conical washers on both sides.
   • Bend the exhaust heat shield if necessary to prevent it from touching the hitch.

5. Tighten Fasteners:

   • Use a torque wrench to tighten all M12 fasteners to 76 lb-ft (103 N·m).

For RX450h Models:

1. Remove Underbody Panel:

   • Use a 10mm socket to remove 13 fasteners securing the underbody panel. One plunger-style fastener is located behind the wheel well trim on the driver side.
   • Retain the underbody panel for reinstallation after trimming.

2. Remove Hole Plugs:

   • Remove three rearmost hole plugs from the driver side frame rail using a flat head screwdriver.

3. Remove Tow Loop:

   • Use a 17mm socket to remove the two M12 bolts securing the tow loop on the passenger side. Return the tow loop and fasteners to the vehicle owner.

4. Lower Exhaust:

   • Use a 12mm socket to remove two M8 bolts holding the exhaust hanger on the passenger side. Retain the bolts for reinstallation.

5. Install Hitch:

   • Raise the hitch into position over the exhaust.
   • Install two M12 bolts and conical washers on both sides.

6. Tighten Fasteners:

   • Use a torque wrench to tighten all M12 fasteners to 76 lb-ft (103 N·m) and M8 fasteners to 27 lb-ft (37 N·m).

7. Reinstall Exhaust:

   • Use a 12mm socket to reinstall the M8 bolts, conical washers, and hex nuts.

8. Trim Underbody Panel:

   • Use a hacksaw to trim the appearance panel in two places. Obtain vehicle owner approval before trimming.

9. Reinstall Underbody Panel:

   • Use the 13 retained fasteners to reinstall the appearance panel.

Hardware List:

• RX350:
  • (4) M12 x 1.25 x 40mm CL10.9 Hex Bolts
  • (4) 1/2” Conical Washers
• RX450h:
  • (4) M12 x 1.25 x 40mm CL10.9 Hex Bolts
  • (4) 1/2” Conical Washers
  • (2) 3/8” Conical Washers
  • (2) M8 Hex Nuts

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Follow safety precautions when working beneath the vehicle, and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type and Weight Ratings:
  • Weight Carrying: Max Trailer Weight 4,500 lbs (2,043 kg), Max Tongue Weight 675 lbs (306 kg).
  • Weight Distributing: Max Trailer Weight 4,500 lbs (2,043 kg), Max Tongue Weight 675 lbs (306 kg).
• Complies with safety specifications and requirements for connecting devices and towing systems of the State of New York, V.E.S.C. Regulation V-5, and SAE J684.

Installation Instructions for Modulite® HD Protector Vehicle Wiring

Part Number:

• 119148

Tools Required:

• Phillips Head #2 Screwdriver
• Wire Cutters
• Wire Strippers/Wire Crimpers
• Tester or Volt Meter
• Socket & Ratchet Set
• Drill with 3/32” Drill Bit
• Double-Sided Tape

Step-by-Step Instructions:

Tow Vehicle Inputs - Determination:

1. Disconnect and isolate the vehicle's negative battery terminal.
   • Warning: Read and follow all warnings and instructions on the tow vehicle's battery.
2. Splice the tow harness input wires to the vehicle as determined.
   • Caution: Use appropriate gauge wire splices. Blue taps are for 16-18 gauge wires only.

Harness Installation:

1. Determine the mounting location of the module and secure it using the double-sided tape provided.
   • Warning: Mount the module with the epoxy side pointed towards the ground to prevent water buildup.
2. Locate a suitable grounding point near the module, such as an existing ground stud, or drill a 3/32” hole to secure the white wire using the provided eyelet and screw.
   • Caution: Verify what is behind any surface before drilling to avoid damage or personal injury.
3. Route the power wire to the vehicle’s positive battery terminal. Use the provided fuse holder, butt connector, and ring terminal to connect to the battery.
   • Do not insert the 15 amp fuse yet.
   • Caution: Ensure the module is connected to a constant power source and avoid routing the wire near hot pipes, heat shields, fuel tanks, or pinch points.

Completion:

1. Secure the harness with cable ties provided to prevent damage or rattling.
2. Reconnect the vehicle's negative battery cable.
3. Insert the 15 amp fuse into the fuse holder and close the cap.
4. Test the installation using a test light or trailer. Check each function independently and in combination.

Hardware List:

• 8 × Cable Ties, 8.5”
• 1 × 15 AMP Fuse
• 2 × Ring Terminals
• 1 × Fuse Holder
• 2 × Yellow Butt Connectors
• 1 × Self-Tapping Screw
• 4 × Blue Taps
• 1 × Spade Terminal

Wiring Outputs:

• White Wire: Ground
• Brown Wire: Tail
• Yellow Wire: Left Turn/Brake
• Green Wire: Right Turn/Brake
• Red Wire: Stop (for 3-wire systems only)

Safety Notes:

• Always read and follow all warnings and instructions included with the product and the vehicle's manual.
• Do not exceed the manufacturer’s towing capacity or the product’s amperage ratings.
• Wear safety glasses and use all necessary safety precautions during installation.

Troubleshooting Guide:

• 4-Flat Not Functioning: Ensure input wires are correctly installed and repeat testing after removing the 15 amp fuse for 10 seconds.
• No Power to 4-Flat: Check the chassis ground and ensure the module is properly connected to a constant power source.

Specifications:

• Installation Time: Approximately 45 minutes
• Compatibility: Does not work with multiplex vehicles (BM, BT, or BTT). Use part numbers 119190 or 119250 for these systems.

Attention: This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.

For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.

For warranty information, please download the full installation PDF.