Identify the installed screen before requesting a change
Ask for the vehicle identity, build information and a clear photograph of the system information page where accessible through normal settings. Record whether the screen is original or a replacement. A seller who has changed the head unit should provide its make, model and installation details rather than describing it simply as the latest screen.
Keep this record with the CS55 specification record. The purpose is to connect the promised language to identifiable hardware and software. It also gives a service provider something useful to assess if a change is proposed. Do not assume that instructions for an original CS55 apply to a later PLUS, even when their menu icons appear similar.
Demonstrate the language selection on the offered car
Request a short, continuous recording of the language menu and the resulting interface. Ask the seller to show the main settings, audio controls and climate interface where fitted. A single photograph of an English home screen leaves the rest of the system untested. Confirm which language remains after an ordinary shutdown and restart performed according to the vehicle instructions.
Keep the instrument display separate from the centre screen. Record the languages shown for ordinary vehicle information and any messages already present. Do not deliberately trigger faults to obtain warning examples. If important information remains untranslated, describe that limitation to the buyer and ask the appropriate service provider what supported options exist.
Separate English menus from connected services
A readable interface does not establish navigation coverage, account access, voice-command language or online service availability in the destination. List these functions separately. For each one, record what was demonstrated, where it was demonstrated and whether a network or account was required. Do not sell an untested online feature as part of the confirmed equipment.
Phone projection is another separate question. An English app on a paired phone may appear on a screen without changing the underlying vehicle settings. Use the phone connection checklist to test the intended phone and connection method. This prevents a successful music demonstration from being used as evidence for English instrument messages or navigation.
Ask what a proposed conversion actually includes
If English is unavailable in the existing menus, ask the supplier to describe the proposed work in writing. Identify the provider, supported vehicle configuration, functions covered and responsibility if other features stop working. A promised conversion should remain an outstanding purchase condition until its result can be demonstrated on that VIN.
Avoid accepting vague assurances that any firmware file or replacement display will work. This guide does not provide flashing instructions. A competent provider needs to assess compatibility and dependencies, including camera displays, steering-wheel controls and vehicle settings. Request the supported recovery and aftercare arrangements before agreeing to a modification rather than discovering those limits after handover.
Retest the functions that matter to your customer
After any agreed change, repeat the original demonstration. Check ordinary screen start-up, language persistence, audio, controls and the fitted camera display under safe stationary conditions. Record functions that were not tested. A successful language change is incomplete evidence if it leaves the buyer's required equipment unverified.
Use the broader cabin and equipment review for the rest of the interior. Keep the results specific: English centre-screen menus demonstrated, instrument language awaiting confirmation, or phone projection not included. This wording helps your sales team explain the vehicle accurately without promising a fully localised experience from a limited test.
Make language an acceptance condition
State which displays must support English and which functions can be accepted in another language. For a new car, ask for the demonstration before release even if the quotation lists English support. For a used car, include any replacement-screen history and available service records. Do not transfer the result from a previous vehicle to the next offer.
Attach the agreed demonstration to the final equipment checklist. If the seller substitutes another car, reopen the check. In a dealer batch, distinguish verified cars from those still awaiting evidence. A clear language requirement helps source a suitable candidate; it does not imply that every year, market or CS55 PLUS generation has the same built-in options.
