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Old 03-13-2020, 01:32 PM   #30
itsAlex
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Join Date: Jan 2016
Drives: 2016 4Runner / 2016 FR-S
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Quote:
Originally Posted by Trap63 View Post
Hello @EZx2, do this mosfet control ground circuit in unit? or whatelse?
Yes, that is correct. This mosfet does the switching for the ground circuit on the dome lights. It doesn't do anything else besides that.

Quote:
Originally Posted by GJR726WY View Post
Yes the bulb is good, If I put it in the other door it will light up normally. I'm unsure what you mean by "harness behind the door panel". I haven't investigated anything further since eliminating the BIU.
What I meant was, take a look at the wires that are attached to the bulb socket. Make sure they are intact and there is no damage to them. You'll most likely have to remove the door panel to take a proper look at the wires though.
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