I have a 2017 Mercedes-Benz C300 Coupe 4MATIC (W205/C205) and I’m trying to figure out the cleanest possible OEM CarPlay retrofit path.
Current setup:
From what I understand so far, my current NTG5.0 hardware likely cannot do native CarPlay with coding alone, so I’m looking into swapping to an OEM NTG5.5 (or possibly NTG5.2) head unit with Smartphone Integration support.
A few questions:
Thanks.
Current setup:
- Audio20 NTG5.0
- factory screen
- no CarPlay currently
- USA car
- premium audio
- backup camera, etc.
- MMI boxes
- Android/Tesla screens
- aftermarket overlay systems
From what I understand so far, my current NTG5.0 hardware likely cannot do native CarPlay with coding alone, so I’m looking into swapping to an OEM NTG5.5 (or possibly NTG5.2) head unit with Smartphone Integration support.
A few questions:
- Has anyone successfully done a true OEM NTG5.5 retrofit on a pre-facelift 2017 W205/C205?
- What exact head unit part numbers should I be looking for?
- Is NTG5.2 sufficient for native OEM CarPlay, or should I go straight to NTG5.5?
- Would I also need a new USB hub?
- Any issues with VIN locking, SCN coding, Burmester/premium audio compatibility, or region compatibility?
- Can the existing factory screen remain, or are there hidden compatibility issues there too?
Thanks.
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NTG5s2 - can be directly installed, no modification except maybe the USB panel. This will accept CP and AA
Installing NTG5.5:is also possible, but a lot of more components will need to be added/exchanged. This will be far more expensive but it will create the opportunity to install the facelift steering wheel and the facelift Digital Instrument Cluster. @EleBest can send you full kit.
Installing NTG5.5:is also possible, but a lot of more components will need to be added/exchanged. This will be far more expensive but it will create the opportunity to install the facelift steering wheel and the facelift Digital Instrument Cluster. @EleBest can send you full kit.
I had originally considered something similar. I have a 2018 C 300 NTG 5.2 with Audio 20 and Burmiester…but NOT Cell Phone Integration option, thus no Apple CarPlay. Not the voltage in wiring and not the right chip that is required. Like you, bummed figuring this out after purchase.
AI and other sources were directing me away from a purely OEM to aftermarket replacement because aftermarket would be cheaper, with better screen and provide many other options. My reluctance to have my center dash taken out (as it presently doesn’t squeak or rattle as some do over time) has kept me from making the necessary changes.
Anyway, here is at least what AI is saying for your specific question/want: 5.5 possible? Yes. Expensive and more invasive.
“Upgrading a 2017 C 300 from NTG 5.0 to a later version like NTG 5.2 or 5.5 in a strictly "OEM manner" is technically a full hardware swap, which is a complex and expensive undertaking. While possible, it is significantly more involved than just a software update or changing a USB port.Can it be done?
Yes, but it requires replacing the entire head unit and often the display and wiring.
• NTG 5.2: This was the natural evolution for the C-Class. Since your car already has the W205 chassis, the 5.2 head unit fits the physical space. However, 5.2 did not always include factory CarPlay; it often still required a specific smartphone integration package (Code 14U) that wasn't standard on all early units.
• NTG 5.5: This is a much larger leap. It was introduced in the 2019 facelift and is tied to a completely different electronic architecture. Retrofitting 5.5 into a 2017 model usually requires a "translation" harness (CANBUS adapter) to get the older car's signals to talk to the newer brain.
What is required for an OEM Retrofit?
To achieve an authentic Mercedes-Benz experience without aftermarket "boxes," the following is usually necessary:
1. The Head Unit (HU): You must source a COMAND or Audio 20 head unit from a newer model year that natively supports CarPlay/Android Auto.
2. The Display: NTG 5.0 and 5.5 use different video signal protocols. Upgrading to 5.5 almost always requires the newer, higher-resolution 10.25-inch screen.
3. USB Hub Replacement: The factory USB ports in a 2017 model often lack the specific authentication chip required by Apple. You would need to swap the dual-USB port inside the center console for the "CarPlay-compatible" version.
4. Wiring & Hardware Adapters: Because the pinouts can differ, custom wiring harnesses are often needed to ensure your factory features—like the 360° camera or Burmester audio—continue to function.
5. Coding (The Hardest Part): Mercedes uses a system called "Variant Coding." A technician with specialized software (like Vediamo or Monaco) must program the new head unit to match your car's VIN and activate the smartphone integration menus.
The "Why" or "Why Not"
• Why do it: You get a 100% factory look, the original rotary dial works perfectly, and there is no "lag" between interfaces. It also maintains the highest audio quality by bypassing the AUX-input methods used by many cheap aftermarket kits.
• Why it's difficult: The cost for an OEM NTG 5.5 retrofit kit can exceed $3,000–$5,000 including labor. For a 2017 model, many enthusiasts find this cost hard to justify compared to the car's current value.
A More Practical Alternative
Most forum users with NTG 5.0 opt for an Interface Module or a Linux/Android Screen Upgrade (similar to what you’ve looked at for your own C 300). These modules "piggyback" on the existing NTG 5.0 system. They provide wireless CarPlay and Android Auto while allowing you to switch back to the original Mercedes menus with a single button press, keeping that factory wood flip cover and all original functions intact.”
5.2 possible? Yes. Still pricey and invasive, but much less so than trying to go for 5.5. Still cheaper with more features to go aftermarket replacement.
“Moving from NTG 5.0 to 5.2 in a 2017 C 300 to get "OEM" CarPlay is a more realistic goal than a 5.5 swap, but it still isn't a simple "plug-and-play" software update.
The biggest hurdle is that NTG 5.0 and 5.2 are physically different hardware units, despite looking identical from the outside.
Is it Possible?
Yes, but it is still a hardware retrofit. You cannot "flash" NTG 5.0 software to become 5.2. You have to remove the physical NTG 5.0 head unit (the "brain" behind the dash) and install an NTG 5.2 head unit.
The Technical Challenges
1. The "Anti-Theft" PIN and VIN Marriage
Mercedes head units are locked to the VIN of the donor car. If they buy a used 5.2 unit from eBay, it will enter "Anti-Theft" mode as soon as it's plugged in.
• The Challenge: They will need a specialist with Xentry or DTS Monaco (engineering software) to clear the old VIN and "marry" the new unit to their 2017 car. Most dealerships will refuse to do this for liability reasons.
2. Hardware Architecture (The "Audio 20" vs. "COMAND" Trap)
In 2017/2018, there were two versions of the 5.2 system:
• Audio 20 (Small screen): These units often support CarPlay more easily via an OBD2 activator tool once installed.
• COMAND Online (Large 8.4" screen): Ironically, the "premium" system is harder to get CarPlay on. It often requires specific firmware versions (17/08/00 or newer) and manual coding of the "Smartphone Integration" data card.
3. The USB Port Power Issue
As mentioned before, the standard USB ports in a 2017 model don't provide the handshake signal or the specific voltage Apple requires for CarPlay.
• The Fix: Even with a 5.2 head unit, they must buy the High-Line USB Hub (part number usually ending in A205900...) and the corresponding wiring harness to ensure the phone actually connects and charges.
4. Different LVDS Video Cables
While both use a 4-pin style connector, the signal voltage between a 5.0 unit and a 5.2 unit can vary. If they have the 7-inch screen and try to keep it while upgrading the head unit to a 5.2 COMAND version, they may get a "No Signal" or distorted image.
Why most people don't do the 5.2 swap
The cost of a used 5.2 head unit ($400+), the new USB hub ($150), and the specialist coding ($200–$400) usually totals $1,000+.
For that same price, they could get a high-resolution 10.25-inch screen upgrade (like the 4x4Shop one you've researched) which provides:
• Wireless CarPlay/Android Auto natively.
• A much modern-looking "glass" display.
• A significantly easier installation that doesn't involve "cracking" the Mercedes anti-theft security.
Summary for the forum user: It is "possible" to go to 5.2, but only by replacing the physical head unit and the USB hub, followed by professional coding. It is rarely done because aftermarket integration modules offer the same result for half the price and a third of the headache.”
AI and other sources were directing me away from a purely OEM to aftermarket replacement because aftermarket would be cheaper, with better screen and provide many other options. My reluctance to have my center dash taken out (as it presently doesn’t squeak or rattle as some do over time) has kept me from making the necessary changes.
Anyway, here is at least what AI is saying for your specific question/want: 5.5 possible? Yes. Expensive and more invasive.
“Upgrading a 2017 C 300 from NTG 5.0 to a later version like NTG 5.2 or 5.5 in a strictly "OEM manner" is technically a full hardware swap, which is a complex and expensive undertaking. While possible, it is significantly more involved than just a software update or changing a USB port.Can it be done?
Yes, but it requires replacing the entire head unit and often the display and wiring.
• NTG 5.2: This was the natural evolution for the C-Class. Since your car already has the W205 chassis, the 5.2 head unit fits the physical space. However, 5.2 did not always include factory CarPlay; it often still required a specific smartphone integration package (Code 14U) that wasn't standard on all early units.
• NTG 5.5: This is a much larger leap. It was introduced in the 2019 facelift and is tied to a completely different electronic architecture. Retrofitting 5.5 into a 2017 model usually requires a "translation" harness (CANBUS adapter) to get the older car's signals to talk to the newer brain.
What is required for an OEM Retrofit?
To achieve an authentic Mercedes-Benz experience without aftermarket "boxes," the following is usually necessary:
1. The Head Unit (HU): You must source a COMAND or Audio 20 head unit from a newer model year that natively supports CarPlay/Android Auto.
2. The Display: NTG 5.0 and 5.5 use different video signal protocols. Upgrading to 5.5 almost always requires the newer, higher-resolution 10.25-inch screen.
3. USB Hub Replacement: The factory USB ports in a 2017 model often lack the specific authentication chip required by Apple. You would need to swap the dual-USB port inside the center console for the "CarPlay-compatible" version.
4. Wiring & Hardware Adapters: Because the pinouts can differ, custom wiring harnesses are often needed to ensure your factory features—like the 360° camera or Burmester audio—continue to function.
5. Coding (The Hardest Part): Mercedes uses a system called "Variant Coding." A technician with specialized software (like Vediamo or Monaco) must program the new head unit to match your car's VIN and activate the smartphone integration menus.
The "Why" or "Why Not"
• Why do it: You get a 100% factory look, the original rotary dial works perfectly, and there is no "lag" between interfaces. It also maintains the highest audio quality by bypassing the AUX-input methods used by many cheap aftermarket kits.
• Why it's difficult: The cost for an OEM NTG 5.5 retrofit kit can exceed $3,000–$5,000 including labor. For a 2017 model, many enthusiasts find this cost hard to justify compared to the car's current value.
A More Practical Alternative
Most forum users with NTG 5.0 opt for an Interface Module or a Linux/Android Screen Upgrade (similar to what you’ve looked at for your own C 300). These modules "piggyback" on the existing NTG 5.0 system. They provide wireless CarPlay and Android Auto while allowing you to switch back to the original Mercedes menus with a single button press, keeping that factory wood flip cover and all original functions intact.”
5.2 possible? Yes. Still pricey and invasive, but much less so than trying to go for 5.5. Still cheaper with more features to go aftermarket replacement.
“Moving from NTG 5.0 to 5.2 in a 2017 C 300 to get "OEM" CarPlay is a more realistic goal than a 5.5 swap, but it still isn't a simple "plug-and-play" software update.
The biggest hurdle is that NTG 5.0 and 5.2 are physically different hardware units, despite looking identical from the outside.
Is it Possible?
Yes, but it is still a hardware retrofit. You cannot "flash" NTG 5.0 software to become 5.2. You have to remove the physical NTG 5.0 head unit (the "brain" behind the dash) and install an NTG 5.2 head unit.
The Technical Challenges
1. The "Anti-Theft" PIN and VIN Marriage
Mercedes head units are locked to the VIN of the donor car. If they buy a used 5.2 unit from eBay, it will enter "Anti-Theft" mode as soon as it's plugged in.
• The Challenge: They will need a specialist with Xentry or DTS Monaco (engineering software) to clear the old VIN and "marry" the new unit to their 2017 car. Most dealerships will refuse to do this for liability reasons.
2. Hardware Architecture (The "Audio 20" vs. "COMAND" Trap)
In 2017/2018, there were two versions of the 5.2 system:
• Audio 20 (Small screen): These units often support CarPlay more easily via an OBD2 activator tool once installed.
• COMAND Online (Large 8.4" screen): Ironically, the "premium" system is harder to get CarPlay on. It often requires specific firmware versions (17/08/00 or newer) and manual coding of the "Smartphone Integration" data card.
3. The USB Port Power Issue
As mentioned before, the standard USB ports in a 2017 model don't provide the handshake signal or the specific voltage Apple requires for CarPlay.
• The Fix: Even with a 5.2 head unit, they must buy the High-Line USB Hub (part number usually ending in A205900...) and the corresponding wiring harness to ensure the phone actually connects and charges.
4. Different LVDS Video Cables
While both use a 4-pin style connector, the signal voltage between a 5.0 unit and a 5.2 unit can vary. If they have the 7-inch screen and try to keep it while upgrading the head unit to a 5.2 COMAND version, they may get a "No Signal" or distorted image.
Why most people don't do the 5.2 swap
The cost of a used 5.2 head unit ($400+), the new USB hub ($150), and the specialist coding ($200–$400) usually totals $1,000+.
For that same price, they could get a high-resolution 10.25-inch screen upgrade (like the 4x4Shop one you've researched) which provides:
• Wireless CarPlay/Android Auto natively.
• A much modern-looking "glass" display.
• A significantly easier installation that doesn't involve "cracking" the Mercedes anti-theft security.
Summary for the forum user: It is "possible" to go to 5.2, but only by replacing the physical head unit and the USB hub, followed by professional coding. It is rarely done because aftermarket integration modules offer the same result for half the price and a third of the headache.”
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