2020 Defender


The bulb check feature allows an observer to perform a visual check on the operation of the exterior lights.

A bulb check on both the vehicle and connected trailer lights can be carried out via the touchscreen. Alternatively, the buttons located on the left side of the loadspace can be used.


The vehicle does not display any warnings for faulty trailer lights.

Before carrying out a bulb check:

  1. Switch off all of the vehicle’s lights.

  2. Apply the Electric Parking Brake (EPB).

  3. Switch off the vehicle’s ignition.

The bulb check illuminates all of the vehicle's lights and the corresponding trailer lights in turn. The sequence automatically stops after 3 minutes.

Check that each trailer light illuminates at the same time as the corresponding vehicle light when carrying out either of the operations shown below.

Touchscreen operation:

To carry out a bulb check using the touchscreen:

  1. Press the audio on/off button to power the touchscreen. See DRIVER CONTROLS.

  2. Touch the Apps icon on the touchscreen driver side bar. See TOUCHSCREEN HOME MENU.

  3. Select TOW BAR.


  5. Follow the on-screen instructions.

Loadspace button operation:

Press the button on the left side of the loadspace to carry out a bulb check. Press the button a second time to stop the bulb check.