Toyota Repair: spark plugs, toyota sienna xle, door locks

Question
Toyota Sienna XLE 1999, Automatic
V6 3.0L 194HP
Oil change in December 2000
Reconnected door integration relay

Hi, I wanted to know where are the spark plugs located in the engine. Are the spark plugs platinum when it came as stock?
Also the door locks makes the clicking sound.
The repair invoice says "If door lock keeps turning on and off, replace the integration relay". How much does it cost for a new integration relay?

Answer
Your plugs are platinum.  The three in the front are easy to get to under the spark plug boots.
The three in the back are more difficult and depending on your skill level you may consider someone experienced replace them.

Intergation relays don't fail that often. If the door locks cycle on and off it may be a failing door lock motor.

You may consider a visit to the local Toyota dealer.