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So we're all on the same page, these are the schematics I'm looking at from the chilton library MKJ linked to. I cropped and realigned the first schematic to get rid of the sealed headlamp, I have the composite headlamp. The schematic has one flaw I've found, possibly more. Fuse 4, the gage and DRL relay fuse is not hot at all times, it's only hot when the key is on. The schematic I have for a blazer shows that this fuse should only be hot with the key on, the Saturn SL manual I have confirms. I'm not surprised Chilton made a mistake, but it was a little bit of a frustration.

Alright here's what I've found probing the DRL relay:
with the key off
*6, 9 and 8 are all NC
*7 is ground
*10 is NC.

With the key on
*6 is hot
*8 and 9 are NC
*7 is ground
*10 is NC

With the key on and headlights on
*6 and 8 are hot
*9 is NC
*7 is ground
*10 is NC

With the key on, transmission in gear, lights off
*6 is hot
*8 and 9 are NC
*7 and 10 are ground

With the key on, transmission in gear, lights on
*6 and 8 are hot
*9 is NC
*7 is ground
*10 is NC

Lights were switched using the control on the dash as well as the ambient light sensor, where specified above as lights off a light was put on the ambient light sensor to force the lights off even though it was getting dark.

It looks like pin 9 is never getting power, but there's that diode in there, I'm not sure I understand what its purpose is.

So far I've confirmed the DRL relay is working properly, I switched the DRL relay with the other relay next to it that keeps the accessories on until a door is opened, both relays function properly in that socket. The ambient light sensor is working properly (which isn't shown on the schematic,) the knob on the dash is working properly, the steering column multifunction switch is working correctly, the parking brake switch is working correctly (which isn't shown on this schematic) the flash to pass seems to work, I'm not sure I'm using it correctly, but if I pull the turn signal lever back but not far enough to click the lights will momentarily turn on. I'm suspicious the diode has gone bad and is blocking current in both directions, or there's a loose connection somewhere on the white or yellow wire that attach to the diode. Where in the heck is that diode located???

Option #2- The schematics I have for a blazer and saturn show a DRL module rather than the BCM controlling the DRL relay, the schematics are much more involved and include switching from the ambient light sensor, parking brake and gear selector. I have a feeling that there is too much missing from the schematic above.

Posted by: charlesbetheareast1946aez.blogspot.com

Source: https://www.astrosafari.com/threads/2000-safari-rwd-dlr-not-working.9056/