Installation guide

Before you start

• Confirm the chassis code and factory system against the fitment table for that model.
• Disconnect the negative battery terminal and wait ten minutes.
• Protect the trim and centre console with a cloth before levering.
• Have a plastic trim tool set and a torque driver ready.

Step sequence

1. Remove the trim. Vent surrounds and the head unit surround come off first. Work from the bottom edge upward.
2. Unbolt the factory unit. Four screws on most BMW and Mercedes chassis; Audi units usually sit on release clips.
3. Connect the harness. The loom plugs inline between the car connector and the new head unit. No wire is cut.
4. Route the antennas and USB. GPS antenna goes behind the instrument cluster; USB leads drop into the glovebox or centre armrest.
5. Test before reassembly. Power on and check audio, controller, reversing camera and steering-wheel buttons.
6. Reassemble. Refit the surround and vents, then reconnect the battery.

Common checks after fitting

• No sound: check the fibre-optic or AUX loop in the harness.
• Reversing camera blank: confirm the reverse trigger wire is on the correct pin for that chassis.
• Controller not responding: re-seat the CAN connector and cycle the ignition.
• Radio reception weak: make sure the antenna adapter is fully seated.