DRL indicator on dash will flash at random after driving approx 10 miles with headlights on. Today when turning to "mist" for windshield wipers, it goes 5 times and sometimes just once. It's always just cleared the windshield the one time. While sitting at a stop light I heard a clicking noise from possibly the glove box area that clicked in time with the flashing of the daytime running lights indicator on dash. Again, my headlights were on. What might be causing this? Blazer seems possessed out of nowhere. It's a 97 Blazer if that makes a difference.

Probably the bulb for the indicator. There is no I separate fuse.

in canada? with DRL?
is the charge (battery Light on running)
nice photo but do name all lights, i see idle is at 800rpm good.
i see check engine light there, top left. so you need to scan PCM
using any scan tool
that is first.

DRL can shut down for other failures one is charge lamp. on.
if charge lamp is on , do not drive far, or it will stall and battery will discharge and be stranded. (till AAA auto tow is called <jumped)

The common problems with DRL system is wires open circuit near the windshield washer tank. The wiring harness to the headlights.

You have to find the wires that are in open circuit or corroded
hint : after removing the isolated tape pull each wire one at a time and you should find the open circuit
hope it helps

light sensor is going bad..or bad light switch. Sensor are usually located in center of dash facing the windshield. Clean it first and see it that helps.

I have seen this happen way to many times. Pull the light switch out, unplug and replug the wiring harness to the switch and then test it. If that does not work, then you may be looking at a bad switch.

Hey, I'm having a very similar problem. Did you figure it out?

Check and see if your alternator is charging
Low voltage will cause those lights to come on, as the computer is shutting down.

To check your alternator you will need a volt meter... WITH the engine running you should have about 14 volts coming out. IF NOT you need to replace the Alternator!

change the drl module( drivers side) left below headlight and remove plug, stops flashing and no more drl free solution ....or change drl module approx 70.00 pt price

You could replace the sensor or try disconnecting the DRL control module .What relay was replaced ? I see no relay on wiring diagrams or in service info. Replacing the Daytime Running Lamp (DRL) Ambient Light Sensor isn't hard . Just take the top dash pad off ,easy .
Removal Procedure
Remove the instrument panel (IP) upper trim. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages and Console.
Remove the security system LED. Refer to LED Indicator Replacement - Vehicle Security System in Theft Deterrent.
Twist the DRL sensor counterclockwise in order to remove the sensor from the IP upper trim.
Remove the DRL sensor from the wiring harness.

Removal Procedure
Remove the windshield garnish molding. Refer to Windshield Pillar Garnish Molding Replacement in Interior Trim.
Important: Remove the upper trim panel slowly, the retainer clips could possibly fall into the instrument panel.
Lift the instrument panel (IP) upper trim panel approximately 51 mm (2 in) and pull rearward to release the retainers.
Remove the DRL ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement in Lighting Systems.
If equipped, remove the sun load sensor.

Pull the windshield garnish molding from the A-pillar in order to disengage the retaining tabs and clips.
Remove the windshield garnish molding from the A-pillar.

Daytime Running Lamps (DRL) Control Module
Left side of the IP

Removal Procedure
Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
Remove the instrument panel insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gages and Console.
Slide the daytime running lamp module from the bracket.
Disconnect the electrical connectors.