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Old 12-14-2019, 01:54 PM   #17
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,663
 

2003 L-Series 3.0L Sedan
Default Re: question about daytime running lights

As previously mentioned, relay contacts 30 & 87 sends 12v to the drl series wired circuit to turn on headlights. The jumper inserted into socket terminals 30 and 87 verified the drl circuit. What's missing is either the command (ground) signal from the drl logic circuit in the i/p or 12v on the drl relay, terminal socket pins 85 and 86. One of these two terminals should have 12v on it with ignition on. Two fuses are inline, one before the ignition switch - IGN3@30 amps and one after the ignition switch when its turned on - IGN3@10 amps. Check both fuses.

With ignition on, check for 12v on either 85 or 86. This is the easiest to check. Switched ground from the drl logic board is a little more difficult to test for.

I'm using the wiring diagram from post #2 for reference.

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