Hello everyone. My left DRL stopped working some time ago. I wonder if anyone had the same problem and what was the solution? I'll also post the error from the car's computer. Thanks.

 

Quote

1 Fault found:
18695 - Left LED Module for DRL and Parking Lights 
          B12EC F0 [009] - Voltage Supply Short to Ground
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 41
                    Reset counter: 118
                    Mileage: 184489 km
                    Date: 2024.03.26
                    Time: 17:52:43

                    Terminal 15 status: On
                    Terminal 50 status: OFF
                    CAN-Bus_aktiv: On
                    Status Bremslichtschalter (HW): OFF
                    Status Bremslichtschalter (CAN): OFF
                    OFF: Not operated
                    Position lamps: Not operated
                    Automatic high beam assist: Not operated
                    Low beam: operated
                    Parking light left: Not operated
                    Parking light right: Not operated
                    last_wakeup: no cause for fault protection
                    Voltage: 14.1 V
                    Outside temperature: 16.5 °C

 

I wud start by following the error code. Check for broken wires that cud cause short to ground.

Could be water in headlamp unit, dry it out with a hairdryer or similar to make sure this is not the reason. The code needs to be cleared before retesting. 

1 hour ago, RattleWagon said:

I wud start by following the error code. Check for broken wires that cud cause short to ground.

Do you think the issue could also be the LED driver?

44 minutes ago, remzy said:

Do you think the issue could also be the LED driver?

For disclaimer, I am not familiar with these DRL issues. Sure it is possible but not what the code suggests IMO. I wud expect 'open circuit' type of code from faulty components in the loop. The short to ground suggests that electricity has easier way to ground than going trough the LED system loop. The 'leak' can be anywhere in the system (wiring or components). Wud expect to find something before the LED strip in current flow direction. The suggested water in head lamp is possible reason.

 

Then again, the fault codes are not always accurate. Cud be any fault in the loop, including the LED driver. But code suggests to start looking for short.

Any VCDS code descriptions that describe the actual fault are purely coincidental!

 

They usually say"open circuit or short to ground" which are two mutually exclusive conditions, the control module measures the volt drop when the circuit is commanded, if it is outside of the set parameters it generates the fault code with a dodgy description.