Checking trailer lamps*

Updated 17/11/2023

When connecting a trailer – check that the trailer lamps work before departure.

Checking trailer lamps*

Automatic checking

After a trailer is connected electrically, it is possible to ensure that the trailer lamps are working via an automatic lamp activation. The function helps the driver check that the trailer lamps are working before starting off.

When a trailer is connected to the towbar, the Perform a trailer lamp check? message is shown in the driver display.

Confirm the message by pressing the right-hand steering wheel keypad's O button.

The lamp check starts.

Exit the car to check lamp functionality.

All trailer lamps start to flash - then the lamps are switched on one at a time.

Visually check that all lamps available on the trailer are operational.

After a moment, all lamps on the trailer flash again.

The check is complete.

Rear fog lamp on trailer

When connecting a trailer, there may be instances when the rear fog lamp on the car does not illuminate. In theses cases, rear fog lamp functionality is transferred to only the trailer. Therefore, in these cases, check when the rear fog lamp is activated that the trailer is equipped with rear fog lamp in order to drive the vehicle combination in a safe manner.

Symbols and messages in the driver display

If one or more of the trailer's direction indicators or brake light bulbs is broken, the driver display shows a symbol and a message. Other lights on the trailer must be checked manually by the driver before setting off.

Symbol	Message
	Right trailer turn indicator malfunction Left trailer turn indicator malfunction
	Trailer brake light malfunction

Symbol

Message

Right trailer turn indicator malfunction

Left trailer turn indicator malfunction

Trailer brake light malfunction

If any lamp for the trailer's direction indicators is broken, the driver display symbol for direction indicators will also flash more quickly than normal.