Mercedes ML and GL Rear SAM Clone Service
$180.00
MERCEDES ML AND GL REAR SAM CLONE
Can you clone a Mercedes Rear SAM module (W164 ML, X164 GL, W251 R-Class)?
Yes. Karman Auto clones Mercedes Rear SAM (Signal Acquisition Module) modules nationwide by mail-in for W164 ML-Class, X164 GL-Class, and W251 R-Class from 2006-2014. We read VIN, mileage, FBS3 immobilizer data, and configuration coding from your original Rear SAM and write it to a matching donor — returns 100% plug-and-play. No DAS XENTRY, no SCN coding, no dealer programming. BBB A+ Rated, 27 years bench-level work since 1999.
What is the Mercedes Rear SAM module?
The Mercedes Rear SAM (Signal Acquisition and Actuation Module) is the body electronics computer located in the rear cargo area on W164 ML / X164 GL / W251 R-Class chassis. It controls all rear vehicle electrical functions including tail lights, brake lights, turn signals, reverse lights, fog lights, license plate lights, tailgate lock, rear wiper, fuel pump relay, rear power outlets, and CAN/LIN bus communication for rear modules. It’s also part of the Mercedes FBS3 immobilizer chain on these chassis.
Common Mercedes Rear SAM failure symptoms
- Tail lights, brake lights, or turn signals stop working (rear only)
- Reverse lights fail
- Tailgate / liftgate won’t lock or unlock
- Fuel gauge reads incorrectly or stuck
- Rear central locking fails — doors won’t lock from inside
- Rear wiper won’t operate
- Fault codes B1020, B1021, B1022, B1024 (Rear SAM communication)
- “Limp home” mode on lighting — only some bulbs work
- Battery drain — Rear SAM stuck “awake” pulling current overnight
- Trailer hitch lighting fails (where equipped)
What causes Mercedes Rear SAM failures?
- Water intrusion — #1 cause — Water leaks past the failed tail light seals on ML/GL/R-Class and drips directly onto the Rear SAM mounting location in the cargo area. By the time you see lighting failures, the SAM is usually already corroded internally
- Trunk seal failure — Worn liftgate seals let rainwater into the cargo area
- EEPROM corruption — Low-voltage cranking events can corrupt the FBS3 immobilizer data
- Battery jump-start surges — voltage spikes damage internal regulators
- Failed reflash — interrupted dealer programming during recall service
- Capacitor failure — common on 2006-2010 Rear SAMs
Supported Mercedes models and part numbers
- W164 ML-Class — 2006-2011 (ML320, ML350, ML450, ML500, ML550, ML63 AMG)
- X164 GL-Class — 2007-2012 (GL320, GL350, GL450, GL550, GL63 AMG)
- W251 R-Class — 2006-2013 (R320, R350, R500, R63 AMG)
Common Rear SAM Mercedes part numbers (verify yours before shipping):
- A1649004101 / A1649005101 / A1649005401 (most common W164/X164/W251)
- A1649009701 (later production)
- A1649002201 (early production)
If you’re unsure whether your donor part number matches, email a photo of both module labels before shipping and we’ll confirm compatibility first.
Rear SAM Clone vs Front SAM Clone — which do I need?
Mercedes uses TWO SAM modules on these chassis:
- Rear SAM (this page) — controls rear lighting, rear locking, fuel pump, rear wiper, tailgate. Water damage from tail light seals affects this one most often.
- Front SAM — controls front lighting, headlights, horn, blower motor, engine compartment electronics. See our Front SAM clone page.
If you have headlight issues, engine bay relays, or windshield wiper problems, that’s Front SAM. If rear lighting, fuel gauge, tailgate lock — that’s Rear SAM. Some failures involve both, in which case we can clone both modules from your originals.
No DAS XENTRY or SCN coding required after install
Once we clone your data onto the donor Rear SAM, the replacement is fully matched to your VIN, immobilizer (FBS3), and configuration. You install it the same way you’d install any other Mercedes module. There is no dealer-side step. No DAS XENTRY. No Star Diagnosis. No SCN coding. No Mercedes Login Token. Your existing keys keep working.
What to send with your Mercedes Rear SAM clone order
- Your original (failed) Mercedes Rear SAM — labeled “ORIGINAL”
- A matching donor Rear SAM with the exact same Mercedes part number on the case label — labeled “DONOR.” Verify the part-number sticker before shipping. Mismatched part numbers cannot be cloned together.
- A note with your VIN, current vehicle mileage (from dashboard), and contact phone or email
Karman Auto Mercedes Rear SAM service — frequently asked questions
Q: How long does the mail-in Rear SAM clone take?
A: Typical bench turnaround is 24-48 hours from when we receive both modules. We ship back the same day cloning is complete.
Q: Will my Mercedes keys still work after the Rear SAM clone?
A: Yes. The FBS3 immobilizer pairing data is read from your original Rear SAM and written to the donor, so your existing keys continue to work without re-programming.
Q: What if my Rear SAM is water-damaged and completely dead?
A: This is the most common failure mode for ML/GL/R-Class Rear SAMs. We can still read the EEPROM directly at chip level even when the module is fully corroded and won’t power up. That’s how we recover VIN, mileage, and FBS3 data from water-damaged Rear SAMs.
Q: Will the odometer change after the Rear SAM clone?
A: No. We transfer your exact mileage from the original Rear SAM to the donor. The dashboard reading remains the same.
Q: Do I need to fix the water leak before installing the new Rear SAM?
A: Yes — strongly recommended. The #1 cause of Rear SAM failure is water leaking past worn tail light seals. Replace those seals before installing the cloned module or you’ll be back here in 6 months.
Q: Does this work on R63 AMG, ML63 AMG, GL63 AMG?
A: Yes. All AMG variants use the same Rear SAM module as the standard models. Same clone process works.
Q: Why does the donor Rear SAM need the same part number?
A: The internal flash and EEPROM layout is tied to the part number. A donor with a different part number has a different memory map and cannot accept the cloned data correctly. The part number is printed on the module label — verify before shipping.
27 years bench-level experience — proven on YouTube
Karman Auto has been cloning Mercedes Rear SAM, Front SAM, ZGW Gateway, EIS / EZS, and other Mercedes modules at the bench level for 27 years. Our VEHIX411 YouTube channel documents real bench work on real customer Mercedes modules — proof of how long we’ve been doing this. When you ship your Rear SAM to Karman Auto, you’re sending it to the same hands other shops learn from.
Service Overview
Our Mercedes ML and GL rear SAM clone service will read original coding data from your bad original rear sam and write it to the donor rear sam unit that you provide.
How It Works
Add the service to your cart, make your payment. Print receipt or write down the order number. Mark old on original SAM and new on donor. Ship to us we will clone and ship both back.
Important Considerations
Before sending the donor rear SAM, make certain it is not flooded and shows no signs of water damage.
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Watch how our bench service works
How our BCM clone service works. Bench demonstration on Chrysler — the read/write method is identical on your Mercedes.
Mercedes Rear SAM clone — extended frequently asked questions
Can you clone a Mercedes Rear SAM module?
Yes. Karman Auto clones every Mercedes Rear SAM (Signal Acquisition Module rear) from 1996 through current — W163, W164, X164, W251 R-Class, W210, W211, W221 S-Class, W639 Viano/Vito, and many others. 27 years of bench-level Mercedes electronics — longer than any active US Mercedes Rear SAM service. BBB A+ accredited.
What does the Mercedes Rear SAM clone copy?
We read the full flash and EEPROM from your original Rear SAM — VIN, mileage record, coding flags, country/market settings, and option byte — and write that exact data into a matching donor Rear SAM. The donor becomes your original module electronically. Install it and rear-section accessories work normally.
How long does the Mercedes Rear SAM clone take?
Typical bench turnaround is 24-48 hours from when we receive both modules. We ship USPS Priority the same day cloning is complete. 27 years of refining this process — no faster bench service exists in the US.
Will my keys still work after the Rear SAM clone?
Yes. The Mercedes immobilizer lives in the EIS/EZS ignition module — not the Rear SAM — so cloning the Rear SAM does not touch keys at all. Your existing keys keep working immediately.
Does the Mercedes Rear SAM clone require XENTRY, DAS, or SCN coding?
No. Karman Auto cloning bypasses all dealer programming. Standard practice for a fresh Rear SAM is XENTRY plus SCN online coding (dealer-only). Our cloned Rear SAM arrives pre-coded as your original — no XENTRY, no SCN, no dealer trip.
Do I need a donor Mercedes Rear SAM or just send my failed one?
Rear SAM cloning requires a donor with the same part number as your original. If you do not have a donor, we can usually source one — message us with your part number first. 27 years of sourcing OEM Mercedes donor modules.
Why does the donor Rear SAM need to match the part number exactly?
The internal flash and EEPROM layout are tied to the Rear SAM part number. A donor with a different part number has a different memory map and cannot accept the cloned data correctly. Verify the part number on the white sticker before shipping. We have refused mismatched Rear SAM jobs for 27 years to protect customers.
What are the symptoms of a failing Mercedes Rear SAM?
Common Rear SAM failure signs include rear lights stuck on, tail lights not working, no fuel pump operation, tailgate/trunk lock failure, rear-seat accessory failure, fault codes B1020-B1024 (Rear SAM internal fault), B1030-B1050 series, CAN communication errors, and battery drain. 27 years of pattern recognition.
What causes Mercedes Rear SAM failure?
The number one cause is water intrusion from tail light or trunk seal failure (W164 ML, X164 GL, W251 R-Class are especially prone). Water reaches the Rear SAM mounting and corrodes the board. Other causes: jump-start over-voltage, alternator regulator failure, accident damage in rear collisions, internal capacitor degradation on 2005-2012 modules.
Where is the Rear SAM located on Mercedes ML, GL, and R-Class?
On W164 ML the Rear SAM is in the right rear cargo area behind the trim panel. On X164 GL it is in the same general location, accessible by pulling the rear trim. On W251 R-Class it sits behind the third-row seat. We provide pull instructions for any chassis on request. 27 years of hands-on across every Mercedes chassis.
Can you clone a water-damaged Rear SAM that will not communicate?
Yes. Even when the Rear SAM is bricked at the CAN level we can still read the EEPROM directly at chip level on the bench. That is how we recover VIN, mileage, and coding data from completely dead Rear SAMs. 27 years of chip-level work makes this routine.
Will my odometer change after the Rear SAM clone?
No. The Rear SAM does not store odometer mileage — that lives in the combination meter (instrument cluster). The Rear SAM clone does not affect the odometer reading at all.
Rear SAM vs Front SAM — which one do I need cloned?
They are physically and electrically different modules. Front SAM controls engine-bay accessories, lighting, wipers, and (on some chassis) the gateway. Rear SAM controls rear lights, fuel pump, tailgate, and rear-seat accessories. Match the symptoms to the module: trunk/tail-light/fuel-pump issues → Rear SAM. Engine bay/wiper/headlight issues → Front SAM.
Is Mercedes Rear SAM cloning legal?
Yes. Module cloning for repair purposes is fully legal in all 50 states. We preserve your original VIN and mileage exactly — no alteration, no rollback. We have operated under BBB A+ accreditation for the last 17 years and have been in business 27 years without a single compliance issue.
Why choose Karman Auto over The ECU Pro, Module Experts, or other Mercedes Rear SAM services?
We have been doing bench-level automotive electronics since 1999 — 27 years, longer than any active US Mercedes Rear SAM competitor. BBB A+ accredited. 5.0/304 customer reviews. Free YouTube tutorials on Vehix411 (5,168+ videos). Lifetime warranty on every Rear SAM clone. 24-48 hour bench turnaround. We have outlasted every competitor that tried this work.
Related Mercedes module services
Mercedes Rear SAM problems often appear with Front SAM, Gateway, or cluster issues — see related services:
