Audi Q5: Why Aren't My Daytime Running Lights Working Properly?

This article applies to the Audi Q5 (2009-Present).

Car manufacturers designed their cars with many features and styles in mind. As technology has advanced, so did the features on many vehicles. One of many upgraded features available today was the introduction of Daytime Running Lights or DRL's. This was an added safety feature available originally on higher end vehicles. Eventually, this feature became available on many vehicles as a standard option in the interest of driver/passenger safety. It's nice to have an added sense of safety and security when operating your vehicle even in the daytime.

Most DRL's function the same way. They are smaller lights or even the existing low beam bulbs which illuminate during the day even with the light switch off. Furthermore, when you activate your turn signals, some vehicles like the Audi A5 "wink" or turn the DRL off while the turn signal is active. The total function of DRL's is controlled by way of control modules. If there is a defect within these modules, symptoms could include flickering of the Daytime Running Lights or even not functioning at all. However, the issue could very easily be related to a blown fuse, relay or simply a bulb. Learn how to diagnose and repair this issue.

Step 1 – Check the fuses

A bad fuse can really mess things up.

The low beams and DRL's share the same fuses, so start there and hope for a quick fix.

• Identify the fuse you need to check.
• Locate the fuse panel.
• Remove cover and determine the fuse specific to low beams/DRL's.
• Using pliers, remove the fuse.
• Determine if the fuse is blown and replace accordingly.

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If the fuses are good, move on to Step 2.

Step 2 – Check relays

If a relay is faulty, it will not allow continuous current to the module it controls.

Relays work in conjunction with fuses to allow continuous current, so check the condition.

• Locate the relay.
• Use a multimeter to test the continuity across the terminals on the relay.

If the relays are good, move on to Step 3.

Step 3 – Check parking brake

If the parking brake is engaged, the DRL's will not come on.

DRL's are designed to come on when the parking brake is disengaged. If the parking brake is shorting to ground, it may trick the vehicle into thinking the parking brake is still engaged.

• Push down on the parking brake lever and make sure it is not engaged.

If the parking brake is functioning correctly, move on to Step 4.

Step 4 – Check the bulbs

It is possible that you have a blown bulb.

Over time, bulbs can wear out and may need to be replaced.

• Open the hood using hood release.
• Raise and secure the hood.
• Remove shroud using rivet pull tool.
• Remove torx bolts on top of headlight housing.
• Pull headlight assembly towards front of vehicle to gain access.
• Reach behind headlight housing to release fasteners and panel covers.
• Pull out DRL bulb harness.
• Check the bulb for hazing or cracked filaments.

If it is burnt out, then go ahead and replace it.

If the problem still persists after replacing bulbs, move on to Step 5.

Step 5 – Check VIN

There is a chance that your specific vehicle is subject to a recall regarding an issue relating to LED's, DRL's and the electrical system.

Determine if your vehicle is affected by TSB #2020780/3 or TSB #2020780/4.

• Locate the VIN.
• Contact or visit your dealership.
• Have the dealer search and confirm if your model vehicle has been subject to the recall.

Reference TSB #2020780/3 or TSB #2020780/4

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• Q5 DRL Problem Reference to TSB - AudiWorld
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• Q5 Daytime Running Lights Problem - AudiWorld