Day Time Running Lights Relay

In the 1999 Chevrolet Tahoe, the Daytime Running Light (DRL) relay is indeed located under the dash. Here's how you can locate it:

Start by removing the lower dashboard panel on the driver's side. This panel is typically secured with a few screws or clips.

Once you have removed the lower dashboard panel, look for the fuse box. It is usually a rectangular or square-shaped box with a removable cover.

Open the fuse box cover and locate the DRL relay. The relays are typically labeled, and there may be a diagram on the inside of the fuse box cover to help you identify the correct relay.

Look for a relay that matches the description you provided†a small, square-shaped relay with 5 prongs. The DRL relay should be located in close proximity to other relays in the fuse box.

If you're unsure which relay is the DRL relay, you can consult the owner's manual or a service manual for your 1999 Chevrolet Tahoe. These resources often contain detailed diagrams and information about the location of relays and fuses.

Once you have identified the DRL relay, you can try replacing it with a new relay of the same type. If the DRL still does not work after replacing the relay, there may be an issue with the wiring or the DRL module, and it would be advisable to consult a professional mechanic for further diagnosis and repair.

HiYes on your year it is left convenience center so the one you replaced was DRL relay.
Test light to terminal G5 a Purple wire see if voltage is there. This is what pulls relay in from the DRL module also on left side dash. If no voltage then module is not functioning. Also is DRL indicator light on?

Make sure beam indicator is on low beam.
The five trem. To relay hear is what you should read
Pink 12v
Yellow 12v
Purple 12v
Light green/Tan ground
Tan 12v
Do you hear relay click when placed into term?
Also on left side there is the DRL control module has about 11 wires to it this maybe the fault.
Let me know what you get at relay.