Question about 2005 Toyota Sienna LE

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My 2005 Toyota sienna wires that the headlight plugs into have melted. Can I replace the wire harness?

Passenger side headlight light len where headlight plugs in. metal ring on light lens has came off. The wires that plug into the headlight have melted. I need to replace the headlight plug but am unsure if I should replace just that wire or all. High beam bulbs appear fine on both sides.

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: low beam headlights on 2004

You may have replaced the high beam by mistake. The low beam is closer to the exterior (the sides of the car)
Paul G Schmidt
Paulgms@juno.com

Posted on Oct 27, 2008

ourhowse
  • 2007 Answers

SOURCE: How do you change the headlight bulb (low beam) on

You should be able to access the buld holder from the rear of the headlight. It's a nylon bulb holder with a lock thing on it. You squeeze the lock part and turn it counterclock wise, and it should come out. Remove the old bulb and install the new one being careful not to touch the glass of the new bulb with bare fingers. The finger print you will leave can cause the bulb to prematurely die on you.

Posted on Jun 15, 2009

ZJLimited
  • 17970 Answers

SOURCE: How do you change the spark plugs in a 2004 Toyota

1997 Toyota Truck Tacoma 4WD 2.7L EFI DOHC 4cyl

Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Spark Plug - Removal & Installation


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Fig. On the 5VZ-FE engine, you must remove the coil for access to the spark plug

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Fig. Use a 3 / 8 in. ratchet, a locking extension, and a spark plug socket to reach the spark plugs which are deep down in the cylinder head

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Fig. Once loosened, carefully withdraw the spark plug from the cylinder head

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Fig. View of a twin electrode plug that is found in the 5VZ-FE engine


Remove the spark plugs and wires one at a time to avoid confusion and incorrect wiring during installation.

  1. Disconnect the negative battery cable, and if the vehicle has been run recently, allow the engine to thoroughly cool.
  2. On engines equipped with spark plugs, carefully twist the spark plug wire boot to loosen it, then pull upward and remove the boot from the plug. Be sure to pull on the boot and not on the wire, otherwise the connector located inside the boot may become separated.
  3. On engines with coil-over-plug ignition, remove the ignition coil for access to the spark plug. For additional information, please refer to the following topic(s): Engine Electrical, Ignition Coil.
  4. Using compressed air, blow any water or debris from the spark plug well to assure that no harmful contaminants are allowed to enter the combustion chamber when the spark plug is removed. If compressed air is not available, use a rag or a brush to clean the area.
Remove the spark plugs when the engine is cold, if possible, to prevent damage to the threads. If removal of the plugs is difficult, apply a few drops of penetrating oil or silicone spray to the area around the base of the plug, and allow it a few minutes to work.
  1. Using a spark plug socket that is equipped with a rubber insert to properly hold the plug, turn the spark plug counterclockwise to loosen and remove the spark plug from the bore.
WARNING It is recommended that you NOT use a flexible extension on the socket. Use of a flexible extension may allow a shear force to be applied to the plug. A shear force could break the plug off in the cylinder head, leading to costly and frustrating repairs.
To install:
  1. Inspect the spark plug boot for tears or damage. If a damaged boot is found, the spark plug wire must be replaced.
  2. Using a wire feeler gauge, check and adjust the spark plug gap. When using a gauge, the proper size should pass between the electrodes with a slight drag. The next larger size should not be able to pass while the next smaller size should pass freely.
  3. Carefully thread the plug into the bore by hand. If resistance is felt before the plug is almost completely threaded, back the plug out and begin threading again. In small to reach areas, an old spark plug wire and boot or a short length of rubber hose, placed on the spark plug, could be used as a threading tool. The boot will hold the plug while you twist the end of the wire and the wire is supple enough to twist before it would allow the plug to cross-thread.
WARNING Do NOT use the spark plug socket to thread the plugs. Always carefully thread the plug by hand or using an old plug wire to prevent the possibility of cross-threading and damaging the cylinder head bore. Remember, your truck has aluminum cylinder heads and the spark plug threads in the head are easily damaged.
  1. Carefully tighten the spark plug. If the plug you are installing is equipped with a crush washer, seat the plug, then tighten about 1 / 4 turn to crush the washer. If you are installing a tapered seat plug, tighten the plug to 1115 ft. lbs. (1520 Nm).
  2. If equipped with coil-over-plug ignition, install the ignition coil assembly(ies).
  3. If equipped with spark plugs, apply a small amount of silicone dielectric compound to the end of the spark plug lead or inside the spark plug boot to prevent sticking, then install the boot to the spark plug and push until it clicks into place. The click may be felt or heard, then gently pull back on the boot to assure proper contact.

I hope help you. Good luck.

Posted on Sep 30, 2009

  • 617 Answers

SOURCE: spark plug wiring on 2001 Toyota 4 Runner

1st coil goes to 2nd plug on lh side
2nd coil goes to 3rd plug on lh side
3rd coil goes to 1st plug on lh side

Posted on Feb 07, 2010

Testimonial: "Exactly what I needed, thanks"

  • 1 Answer

SOURCE: Toyota Sienna 2004 Headlight Problem

If you have the HID bulbs, and there is moisture in the bottom of the assembly, the high voltage box at the bottom will not work. this requires removing the whole headlamp, removing the circuit board from the bottom and drying out. I have done mine twice before finally finding how water was getting in at the top seam of the lamp assembly. You will have to dis-assemble part of the wheel well and bumper cover to gain access to all the mounting bolts. Best of luck

Posted on May 02, 2010

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When looking from the outside of the headlight at the bulb, can you see the bulb clearly??
These lenses are notorious for dulling very badly. If it has you can use a regular headlight 'restoring' kit sold at most auto part locations.

If it is not a lens issue, you may have a wiring/supply issue.
Then you would need to find the troublesome wire/connection.
I am not the best at wiring issues, but I would try to find a power source wire with the same amperage rating, run a bypass jumper from a known good voltage source and see if the light changes. If no change, your problem may be the harness or plug at the rear of the headlight bulb.
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