Use cases
What “EU conversion” usually means
Market conversion often includes DRL behavior, turn signal logic, language/region settings, module option flags, and other configuration bytes stored in the PROXI map.
EU conversion / market configuration
EU conversion and market settings via PROXI configuration
A clean way to apply market-level configuration changes using the PROXI byte map: region options, feature flags, and retrofit-related parameters on supported Atlantis / Atlantis High vehicles with PROXI-configured BCM.
New: FCA PROXI Tool can work directly with the vehicle for supported read/write operations via
ELM327-compatible adapters or J2534 PassThru — no separate diagnostic application required.
Safety
Why CRC consistency matters
When you edit bytes/bits, the output must remain internally consistent. FCA PROXI Tool recalculates CRC for the configuration buffer so the file remains clean and predictable.
Workflow
Typical workflow
- Read configuration (Direct Connect via ELM327/J2534, or your diagnostic workflow).
- Edit required bytes/bits in Standard / Advanced / PROXI Map Editor.
- Save corrected output and validate on the vehicle.
Conversion solutions (files & instructions)
Need USA→EU conversion for the head unit (radio / infotainment)? We provide ready-to-use instructions + files and personal support. Compatible options depend on the unit model.
Head unit USA→EU conversion
VP4R Panasonic • VP3/VP4 Harman • Maserati Touch Connect • Uconnect 5 (R1)
EU conversion: what changes, what does not
“EU conversion” is a workshop umbrella term. Some parts are purely configuration-based (bytes/bits in the PROXI map), while others are physical or regulatory (hardware, lamps, lenses, labeling). A clean conversion starts by separating these two worlds so you only change what is actually changeable via configuration.
Configuration-based
Typical PROXI-driven changes
- Market / region menus and feature availability.
- Units (km/h vs mph), temperature, pressure units where supported by the platform.
- Infotainment market flags (radio region behavior, language packs, legal screens) where applicable.
- Lighting-related feature flags (DRL logic options, certain lamp behaviors) depending on BCM rules and equipment.
- Retrofit enable/disable flags for supported modules (camera, ACC/ADAS menus, audio system types, etc.).
Not “just software”
What may still require hardware
- True amber turn signals vs shared red lamps: often hardware-dependent.
- Headlamp types (halogen/xenon/LED) and beam patterns: may require correct assemblies and calibration.
- Regulatory items (ECE/DOT compliance) are not “unlocked” by a checkbox.
Rule of thumb: configuration can enable features that the hardware and firmware already support.
Architecture
Why the PROXI map is central
On platforms using a PROXI-configured BCM, many modules rely on the same option map. This is why market changes are usually implemented by editing the correct bytes/bits in the configuration buffer, keeping the file valid, and then flashing it back using your diagnostic workflow.
Why a dedicated PROXI editor is the missing piece
The hard part of EU conversion is not clicking “write”. The hard part is producing a correct, consistent configuration file. The vehicle will only behave predictably when the data is edited precisely and the integrity checks are correct.
Precision
Byte/bit-level editing without guesswork
EU conversion and retrofit tasks often come down to a few bits. FCA PROXI Tool is built around PROXI-style byte maps (Standard and Advanced views) so you can change exactly what you intend to change, and nothing else.
Integrity
CRC-safe output after every change
Editing without recalculating the checksum is where most “mystery bugs” come from. The tool recalculates CRC for the configuration buffer so your exported file stays internally valid after you change bytes/bits.
Workflow-fit
Works with your existing read/write process
FCA PROXI Tool works with exported configuration data (CDA/PROXI buffers) and can also connect directly on supported platforms via Direct Connect (ELM327/J2534) for read/write. The core job stays the same: make the configuration clean, checksum-correct, and predictable.
Practical takeaway: if your EU conversion job is “just a few options”, the safest way is still the professional way: edit the correct bytes/bits and keep the file CRC-correct. That’s exactly what a PROXI configuration editor is for.
A practical EU conversion workflow
This is a typical workflow. The editor is responsible for the configuration file; vehicle communication can be done via your diagnostic tools or via Direct Connect on supported platforms.
Step 1
Read the configuration buffer
Export the relevant configuration data (often called CDA/PROXI buffer depending on platform and toolchain). Keep an untouched backup.
Step 2
Edit market options and flags
Use Standard/Advanced editing to change the specific market settings, units, infotainment flags, and retrofit-related bits your platform supports.
Step 3
Save CRC-correct output
Export the patched file. A CRC-safe export prevents checksum-related failures and makes results repeatable.
Step 4
Flash and validate
Write the corrected configuration back using your diagnostic procedure, then verify behavior: menus, cluster units, lighting logic, and any enabled features.
About PROXI alignment: whether alignment is required depends on platform and how modules evaluate configuration consistency after flashing. If a mismatch state is detected, alignment is required. If the vehicle remains synchronized, alignment may not be triggered.
Model-specific conversion guides (new platforms)
If you work mostly on the newest platforms, use these model pages. They focus on targeted writes, keeping the original Configuration Code, and producing checksum-correct output for workshop workflows.
Dodge
Dodge Hornet US↔EU conversion
Market coding / conversion notes for Hornet: region options, units, behavior flags, and a safe workflow (checksum-correct output + targeted writes).
Jeep
Jeep Grand Cherokee WL US↔EU conversion
Market coding / conversion notes for WL: region options, units, market flags, and a safe workflow (checksum-correct output + targeted writes).
Ram
Ram DT (2025+) US↔EU conversion
Market coding / conversion notes for DT 2025+: region options, units, market flags and targeted writes with checksum-correct output.
Jeep
Jeep Wagoneer / Grand Wagoneer US↔EU conversion
Market coding / conversion notes for Wagoneer & Grand Wagoneer: region options, units, lighting/behavior flags, and a safe workflow (checksum-correct output + targeted writes).
Jeep
Jeep Wagoneer S US↔EU conversion
Market coding / conversion notes for Wagoneer S: region options, units, behavior flags, and a safe workflow (checksum-correct output + targeted writes).
Alfa Romeo
Alfa Romeo Tonale US↔EU conversion
Market coding / conversion notes for Tonale: regional options, units, behavior flags, and a safe workflow (checksum-correct output + targeted writes).
Maserati
Maserati Grecale US↔EU conversion
Market coding / conversion notes for Grecale: regional options, units, behavior flags, and practical access notes for modern platforms.
FAQ
Short answers that match how real workshops talk about EU conversion and PROXI configuration.
Does this page mean you can convert any car to EU with a checkbox?
No. EU conversion is a mix of configuration and hardware/regulatory requirements. PROXI configuration can enable or adjust features that the platform and equipment already support.
Why do I need a dedicated editor if I already can read/write with diagnostics?
Reading and writing is only half of the job. The risky part is editing the buffer correctly and keeping it integrity-valid. A dedicated editor focuses on accurate byte/bit changes, while cloud-based CRC/checksum recalculation keeps the output integrity-valid so the flashed configuration behaves predictably.
Does FCA PROXI Tool replace WiTECH or other diagnostic software?
No. It does not replace full diagnostics. FCA PROXI Tool complements diagnostics by preparing checksum-correct configuration, and Direct Connect can read/write supported buffers for specific workflows.
Can configuration changes affect safety systems?
Configuration affects what modules think is present and enabled. Always apply changes that match the actual equipment and validate the result. If a feature requires calibration, follow the correct diagnostic procedure.
Download FCA PROXI Tool
PROXI configuration editor focused on checksum-safe EU conversion and retrofit workflows. Works with exported buffers and Direct Connect read/write on supported platforms.
Latest build
Glossary (plain language)
A quick decode of the terms you will see in workshop notes and diagnostic logs.
Term
PROXI configuration
A shared option map (bytes/bits) used by modules to enable features and behaviors on platforms with a PROXI-configured BCM.
Term
CDA buffer
A configuration data buffer exported by diagnostics on certain workflows. Names vary by platform and toolchain, but the idea is the same: a structured configuration data block.
Term
CRC
A checksum used to protect the integrity of a buffer. If you change bytes/bits, you typically must update the CRC to keep the file internally valid.