1. Fuses: This is the *first* thing to check. Your owner's manual will show you the fuse box location and diagram. Look for fuses related to the turn signals and hazard lights (often labeled "blinker," "hazard," or with a similar symbol). Visually inspect them for blown filaments (a broken wire inside). Even if they look okay, it's a good idea to replace them with new ones of the same rating as a preventative measure.
2. Hazard Light Switch: This switch is often located on the center console. If it's faulty, it might not be sending the correct signal to the rest of the system. Testing this requires a multimeter to check for continuity.
3. Turn Signal Switch (Stalk): This is the stalk on the steering column that you use to activate the turn signals. Wear and tear, or damage to the internal components, can prevent it from working correctly. Replacing this is often a more involved process.
4. Flasher Unit (Relay): The flasher unit is an electronic component that controls the blinking rate of the lights. A faulty flasher unit can cause the lights to stay on constantly, blink too fast, or not blink at all. This is usually a relatively inexpensive part to replace. Location varies by model; check your manual.
5. Wiring Problems: Damaged, corroded, or loose wiring anywhere in the system can interrupt the electrical signal. This is harder to diagnose and often requires tracing the wires from the switch to the lights. Common points of failure are connections at the lights themselves or near the fuse box.
6. Bulbs: While unlikely to affect both hazards and indicators simultaneously, ensure all bulbs (front and rear) are working correctly. A single burnt-out bulb in some systems can cause the whole side to fail to flash.
7. Control Unit (Central Electronics): This is the least likely cause, but a malfunctioning control unit (part of the car's electrical system) could be at fault. This is a more complex and expensive repair.
Troubleshooting Steps:
1. Check the fuses. This is the easiest and quickest check.
2. Test the bulbs. Make sure all bulbs are working.
3. Inspect the wiring for any obvious damage. Look for broken, frayed, or corroded wires near the lights and fuse box.
4. Try the hazard light switch and turn signal stalk. See if they feel loose or unresponsive.
5. Use a multimeter (if you have one) to check for continuity in the wiring and components. This will require a basic understanding of electrical testing.
If you're not comfortable working with car electronics, it's best to take your Audi to a qualified mechanic for diagnosis and repair. Trying to fix electrical problems without the right knowledge can potentially cause further damage.
