[Brian]

Just wanted to give an update to this issue…. It is RESOLVED.

The source of the problem was Micro Relay #35: HDM Module. Swapped it out for a new one and the lights work as they should now.

From what I’ve read, when these modules go out, their behavior can be erratic – as in they might not always shut off what they control, sometimes they may just act weird – as was the case for me.

Personally, it was a gut feeling for me to replace this relay as it had been replaced before. Last time, it was switched out because the low beams stopped working. The fuses were fine, so the next step up the ladder was MR #35.

In the future, I will inspect the wiring to see if there’s any reason for that relay to act up – my guess will be to follow up around the head lights and back to the fuse box. From the wiring diagram on this link, the wire to inspect closely is C12 – goes out to the low beams.

Hope this helps anyone else in the future!

[Brian]

Thanks. Yeah, I had my own little light go off in my head saying ‘why not just Google what a BCM is’, and that was moments after I posted my reply. But thanks for the link anyway.

I need to look up how to test a relay, like what voltages to look for and whatnot, because the lights came on again today, so I pulled out the one that corresponds with them (can’t remember what it’s called, sorry) to turn the lights out. Then when I went to plug the relay back in, the lights came on instantly, without the car being turned on. I’m almost certain the relay’s the problem now, contrary to what I’ve heard about how they are supposed to function.

[Brian]

What’s the BCM?
And it doesn’t have any aftermarket stuff on it. The alarm system on it came standard.

[Author]

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