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I have a 2002 Toyota Sienna with 180k mileage and recently my interior lights, key fobs, and automatic door locks stopped working. I've noticed clicking noises from time to time and I had this exact same issue for a few days about a year ago, but then everything started working again without me doing anything. I did some basic checking and I've heard this could be the Integrated Relay, due to the symptoms described, especially the clicking sound.

Note: I can open and lock doors manually with the keys and I still have the alarm working manually, that is if the car is locked and I reach in through the window to open it, the alarm sounds as expected.

My questions are:

  1. If it is the the Integrated Relay, how do I test it?
  2. If I do replace the Integrated Relay, do I have to get things reset at the dealer, like you would if it was the ECM?
  3. Would it be more likely that it is something else?

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