My situation is as follows - when the daytime running lights are on, the dashlights do not come on. However, when I turn on the parking lights or the headlights, the dashlight is on. The daytime running lights do come on during the day so the lamps are not burned out. There are three DRL relays numbered DRL 1, DRL 2, and DRL 3. How can I tell which is the bad one?
If you think it is a relay, swap them. My guess is that it is the BCM. Since the dash lights up with the the parking/head light switch. The head light switch over rides the BCM/ DRL controls.
Why would you want the dash lights on with the DRL's ? I wouldn't expect them to be on. You would only have dash lights when conditions require you to have your full lights on. I think you are looking for a fault that's not there. If this doesn't answer your question call the local dealer.
Testimonial: "Well, all I can say is that the dash lights used to be on when the DRL were on. Now they aren't. So, that tells me that there's something wrong somewhere."
OK, you didn't say the dash lights used to be on. Easiest way the test the relays is swap them around with others of the same type and pins and see what happens. If the dash lights are on with main lights the dash bulbs must be OK so check the fuse box and relays.
Just a thought, do the dash lights have a brightness adjustment?.
Yes, but I have checked that. Besides, the dash lights work fine when the headlights or parking lights are on. I don't know if it is related, but I have a Camry and a Yaris and their dash lights are on when I'm driving with the DRLs. 'tis indeed a mystery.
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