Aston Martin Convertible Top Roof Control Module DB9 DBS V12 V8 Rebuilding Service
Aston Martin Convertible Top Roof Control Module DB9 DBS V12 V8 Rebuilding Service
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Convertible Roof Module · Rebuild Service
Aston Martin Convertible Roof Control Module (CRM) — Professional Rebuild Service
Send us your original Webasto Edscha Convertible Roof Module and we rebuild it from the board level up — replacing the degraded microcontroller, performing a full solder reflow, and adding thermal management improvements. Your vehicle-specific calibration data is preserved throughout, so no dealer AMDS reprogramming is required after installation. A true plug-and-play rebuild for the DB9 Volante, DBS Volante, V8 Vantage Roadster, V12 Vantage Roadster, and Virage Volante.
A board-level rebuild that preserves your original coding
The Convertible Roof Module (CRM) — also called the roof ECU, roof control module, or power hood module — is a Webasto Edscha electronic control unit that manages every step of the convertible roof sequence: tonneau latches, hydraulic pump, window drop, bow movement, and deck-lid operation. It communicates over the vehicle’s CANbus and coordinates all roof components in a precise, timed sequence.
Over time, the internal microcontroller on the CRM board degrades due to heat cycling. The module sits in the rear wheel-arch area, exposed to extreme temperature swings, and thermal stress causes the microcontroller’s silicon to degrade and solder joints to crack. Our rebuild replaces the degraded microcontroller, clones your original Flash and EEPROM data onto the new chip, performs a full solder reflow, and upgrades the module’s thermal management so the same failure does not repeat.
Because we rebuild your original module — not a donor or replacement unit — your vehicle-specific calibration data remains intact throughout the entire process. The rebuilt module installs plug-and-play. No AMDS dealer session, no key relearn, no additional scanning required.
✓ Only your original module required
Unlike clone services that require you to source and ship a donor module, this service only needs the one original CRM from your vehicle. Ship it to us — even if it is non-functional — and we ship back a fully rebuilt, bench-tested, plug-and-play unit. If the module is original to your vehicle and has never been replaced, no additional steps are required after installation.
Critical: Rule out these issues before sending your module
Not every Aston Martin roof failure is caused by the CRM. Several common, inexpensive faults produce symptoms identical to a failed CRM and are frequently misdiagnosed — even at main dealers. We strongly recommend having a qualified technician test and rule out all of the following before concluding the CRM has failed. Only once peripheral causes have been eliminated should you send the module.
1 — Ambient Air Temperature Sensor (~$20–$30 part)
The roof system is programmed to refuse operation at temperature extremes. If the ambient temperature sensor (behind the front grille, OEM part 7G3319E642-AB) fails or reads an implausible value — such as 85°C — the car enters a fail-safe and displays “No Roof Operation Possible.” This tiny sensor also affects air conditioning and battery charging. It is always the first thing to check and the cheapest possible fix.
2 — Window Module Calibration Loss (Free fix)
Before the roof sequence begins, each door window must drop slightly to clear the roof frame. If the vehicle battery has been disconnected, gone flat, or been replaced, the window modules can lose their calibration and the roof will not operate. Fix: with the engine running, hold each window switch fully down for 5 seconds, then fully up for 5 seconds. This two-minute recalibration resolves many “roof dead after battery change” situations at zero cost.
3 — Corroded Relays Under the Boot Fusebox
A double-relay base sits beneath the boot (trunk) fusebox in a location that collects standing water. Corrosion of these relays or their socket cuts power to the tonneau latch motors and prevents the roof sequence from completing. The relay hardware itself costs only a few dollars; the proper fix also relocates the relay base above the water line to prevent recurrence.
4 — Tonneau Latch Motor Water Ingress
The latch motors that lock and unlock the convertible deck lid are housed in plastic enclosures that frequently fill with water running down the worm-drive cable. Corroded brushes cause intermittent or complete latch failure. Typical symptom: the roof pauses near the end of its cycle, the button must be pressed twice, or a “Roof Movement Incomplete” message appears. Stripping and cleaning the motor, then drilling drain holes in the housing, is far cheaper than condemning the CRM.
5 — Hydraulic Pump / Motor Failure and Hose Leaks
The 12V DC pump motor that drives the hydraulic roof mechanism can burn out, or hydraulic hoses can develop leaks that leave the system without sufficient pressure. These are purely mechanical failures, separate from the CRM entirely. Replacement pump motors on Vantage Roadster models do not require coding to the vehicle, so no AMDS visit is needed if the pump is the fault.
6 — Tonneau Cover Microswitches
Each tonneau latch contains a small microswitch that signals to the CRM when the latch has reached its final position. A single open-circuit or high-resistance microswitch will cause the entire roof sequence to abort, because the CRM will not proceed without confirmation from every switch. A professional scan tool that can read body-network fault codes (not just generic OBD-II) can identify a microswitch fault in minutes.
A qualified Aston Martin specialist with access to the AMDS diagnostic tool — or a professional scan tool capable of reading body-network fault codes — can distinguish between internal CRM faults (the module itself has failed) and external circuit faults (a peripheral component). Internal faults cannot be cleared; external faults point to the components above. Only once the CRM is confirmed as the fault should you send it to us.
Signs your Aston Martin CRM has failed
The CRM is notorious for triggering symptoms that appear completely unrelated to the roof. When it fails, it can flood the vehicle’s CANbus with spurious signals, disrupting entirely separate systems. Owners consistently describe “the dash lit up like a Christmas tree” with no obvious roof connection. If your vehicle shows any combination of the following, the CRM should be on your diagnostic shortlist:
- Roof will not open or close — complete failure or the roof stops mid-cycle and will not continue
- “No Roof Operation Possible” message — displayed in the instrument cluster or VCDS; roof lockout with no clear trigger
- Roof only fails when hot — works after the car cools overnight but fails again on a warm day; classic sign of thermal microcontroller degradation
- Speedometer stops working — instrument cluster speed display goes dead with no drivetrain fault
- Turn signals or indicators inoperative — stalk commands ignored or signals activate without input
- ABS or SRS warning lights — multiple dashboard warnings illuminate simultaneously with no single mechanical cause
- No-start condition — car will not crank; removing or disconnecting the CRM fuse restores starting immediately
- Parasitic battery drain — battery goes flat overnight; a failing CRM stays active on the CANbus after shutdown
ⓘ Confirming the CRM is the cause
Pulling the CRM fuse, or temporarily removing the module, should restore all non-roof electrical functions immediately — speedometer, indicators, brake lights, and starting. If all other systems return when the module is removed, that is strong confirmation the CRM is flooding the CANbus. Confirm with a professional body-network scan before sending.
Fault indicators and dashboard messages associated with CRM failure
Aston Martin’s roof diagnostic framework distinguishes internal faults — which originate inside the CRM itself and cannot be cleared with any scan tool — from external faults — which originate in the peripheral circuits (latch motors, microswitches, hydraulic pump, window modules). Only internal, non-clearable faults confirm the CRM as the failed component. A generic OBD-II reader cannot access body-network codes on these vehicles; the AMDS tool or an equivalent professional system is required for a complete diagnostic read. Include your full fault report in your work order and we will review before anything ships.
Vehicle compatibility
| Service Type | Board-level CRM rebuild — customer ships original module only |
|---|---|
| Module Designation | Webasto Edscha Convertible Roof Module (CRM) — rear wheel-arch mounted |
| Programming After Install | None required — original calibration data preserved; plug-and-play installation |
| Turnaround | 3–4 business days on the bench + tracked return shipping |
| Warranty | 6 months, confirmed in writing with your work order |
| Platform | Years | Models & Trims | Engine |
|---|---|---|---|
| DB9 Volante | 2004–2016 | DB9 Volante · DB9 GT Volante All trim variants |
5.9L / 6.0L V12 |
| DBS Volante | 2010–2012 | DBS Volante All trim variants |
6.0L V12 |
| V8 Vantage Roadster | 2006–2017 | V8 Vantage Roadster · V8 Vantage S Roadster Manual & Sportshift variants |
4.3L / 4.7L V8 |
| V12 Vantage Roadster | 2010–2017 | V12 Vantage Roadster · V12 Vantage S Roadster All variants |
6.0L V12 |
| Virage Volante | 2012 | Virage Volante Shares DB9 roof system |
6.0L V12 |
ⓘ Confirming your fitment
Not sure which part number is on your module? Include your 17-digit VIN and a clear photo of your module label when you submit your work order — we cross-reference fitment before any work begins. This service covers the Gaydon-era VH-platform convertibles listed above. The DB11 Volante (2017+), DBS Superleggera Volante, and 2025 Vantage Roadster use different roof architectures and are not covered by this service.
Compatible OEM part numbers
Match the number printed on your module label to the platform group below. Hyphens and spaces in part numbers are interchangeable — the base number is what matters.
| DB9 Volante & DBS Volante (9G43 / 4G43 prefix) |
9G43-L53085-AE · 9G43L53085AE 9G43-L53085-AD · 9G43L53085AD 9G43-L53085 9G43-13B524-CC 4G43-13B524-CB |
|---|---|
| V8 & V12 Vantage Roadster (6G33 prefix) |
6G33-13B524-AB 6G33-13B524-CH |
| Vanquish Volante (ED33 prefix) |
ED33-13B524-AA · ED33-13B254-AA |
Part number suffixes (-AE, -AD, -AB, -CH, etc.) denote hardware and software revisions. Always match by VIN rather than suffix alone, as revision levels vary by production date. Not seeing your number? Send your VIN and a photo of both sides of your module label — we verify against the full parts catalog before work begins.
Our CRM rebuild process — four simple steps
- Submit a work order Provide your 17-digit VIN, the part number from your module label, and your symptoms or fault codes. We confirm fitment and service scope by email — same business day.
- Ship your original module Package your CRM securely using a rigid box and bubble wrap, and ship it to our Fort Myers, FL facility using a tracked, insured service. Shipping instructions are sent with your work order confirmation.
- Rebuild, reflow & bench-test We replace the degraded microcontroller, clone your original calibration data onto the new chip, perform a full solder reflow, upgrade thermal management, and bench-test all electrical functions. Everything is documented.
- Back in 2–3 business days Your rebuilt, plug-and-play CRM ships back with tracked return, installation notes, and your 6-month warranty confirmed in writing. No dealer visit required after installation.
Submit a work order — we reply the same business day
Tell us your VIN, the part number on your CRM label, and your symptoms or any fault codes you have pulled. We will confirm fitment, review your diagnostic information, and send step-by-step packaging and shipping instructions — all in one documented email thread.
Submit a Work Order →Questions first? Email support@ecumaverick.com — Monday–Friday, 9:30 AM – 4:30 PM ET.
Frequently asked questions
What exactly is the Aston Martin CRM rebuild service?
We perform a board-level rebuild of your original Webasto Edscha Convertible Roof Module. This involves replacing the degraded internal microcontroller (cloning your vehicle-specific Flash and EEPROM data onto a new chip), performing a full solder reflow of all suspect joints, and upgrading the module’s thermal management. The result is a module that functions like new, with your original calibration data intact.
Why does the Aston Martin Convertible Roof Module fail?
The primary cause is thermal degradation of the module’s internal microcontroller. The CRM is mounted in the rear wheel-arch area and is exposed to repeated heat cycles. Over time, the microcontroller’s silicon degrades and solder joints develop micro-cracks from thermal fatigue. Our rebuild addresses the root cause by replacing the chip itself — not just reflowing the board — and adds improved thermal management so the same failure pattern does not repeat.
My roof only fails on hot days or when the car sits in the sun. Is that the CRM?
That is a strong indicator of CRM failure. Thermal degradation of the microcontroller almost always presents as intermittent failure in warm weather that resolves after the car cools overnight. That said, we still recommend ruling out the ambient temperature sensor first, since a faulty sensor can also trigger a temperature-based roof lockout for far less cost.
My dashboard has ABS warnings, no speedometer, and the car won’t start. How is that a roof problem?
When the CRM fails, it can flood the vehicle’s CANbus with spurious signals that disrupt entirely unrelated systems — speedometer, indicators, ABS, brake lights, and even the starting circuit. This is one of the most misunderstood aspects of CRM failure. Temporarily removing the CRM fuse will typically restore all other functions immediately. If that happens, the CRM is confirmed as the source of the disruption.
Do I need dealer AMDS reprogramming after installing the rebuilt module?
No. Because we rebuild your original module and preserve your vehicle-specific calibration data throughout the process, the rebuilt unit is fully plug-and-play. No AMDS dealer session, no key relearn, and no additional scanning is required after installation. This is the key advantage of a rebuild over buying a new or used replacement module, which must be coded to your VIN by a dealer before the roof will operate.
What other issues can cause the Aston Martin roof to stop working?
Several common faults produce identical symptoms to CRM failure: a failed ambient temperature sensor (very cheap fix), window module calibration loss after battery replacement (free fix), corroded relays under the boot fusebox, water-damaged tonneau latch motors, hydraulic pump or hose failure, and faulty tonneau microswitches. We strongly recommend a professional body-network diagnosis before sending your module. If any of those components are at fault, they can be repaired or replaced far more cheaply than the CRM rebuild. Only send the module once those causes have been confirmed clear.
Do I need to send anything else with the module?
No — just the module itself. Keep your connectors, mounting hardware, and bracket at the vehicle. Include your work order confirmation reference in the box so we can match it immediately on arrival.
My original module has already been replaced once. Can you still rebuild it?
If your current module is a replacement rather than the original factory unit, please contact us before shipping. We prefer to review your vehicle history and confirm that the replacement module’s stored calibration data is complete before proceeding. In most cases it is still rebuildable, but we verify first.
What is the turnaround time?
2–3 business days on the bench from the day we receive your module, plus return shipping transit time. We confirm receipt by email the day your package arrives and notify you the moment it ships back.
What warranty comes with the rebuilt module?
Every rebuilt module is covered by our 6-month warranty, confirmed in writing in your work-order email thread. The warranty covers failure of the rebuild work under normal vehicle operating conditions. It does not cover damage caused by other vehicle faults such as corroded connectors, short circuits, hydraulic system failure, or water ingress into the vehicle’s electrical system.
Independent service — important notice
ECU Maverick is an independent module repair and programming service. We are not affiliated with, endorsed by, or sponsored by Aston Martin Lagonda Limited or any other vehicle manufacturer, nor with Webasto Edscha or any other component manufacturer. All trademarks, including Aston Martin, DB9, DBS, V8 Vantage, V12 Vantage, Virage, Vanquish, Volante, Roadster, AMDS, and Gaydon, belong to their respective owners and are referenced solely for fitment identification purposes. Services are performed by ECU Maverick independently of the original equipment manufacturer.
Getting Started
Submit Your Work Order
Fill out our simple work order form to get your unique work order number. We'll email you shipping instructions immediately. Ship your module to us using any carrier (USPS, FedEx, UPS). Include your work order number with your shipment.
What's Covered
Thorough Bench Testing
Every module is tested before and after repair to ensure full functionality. If your unit tests fine, shows no issues, or is deemed non-repairable, a bench fee applies. We'll contact you before charging anything beyond the base service fee.
What to Expect
Turnaround & Warranty
✓ Turnaround: 2-3 business days (complex jobs may take longer)
✓ Warranty: 6 months on repairs we perform
✓ Programming: Not required—plug and drive
About ECU Maverick — Expert ECU Repair & Programming Services
ECU Maverick specializes in component-level ECU repair and programming for European, domestic, and specialty vehicles. Based in Fort Myers, Florida, we serve independent repair shops, dealerships, and vehicle owners nationwide.
Where most shops rely on reprogram-and-replace methods, we take a different approach. Our technicians diagnose and repair individual circuits at the board level, restoring modules that others write off as failures. This expertise comes from years of reverse engineering and bench testing across thousands of control units.
Vehicles We Service
We specialize in European automotive electronics, including BMW, Mercedes-Benz, Audi, Porsche, Land Rover, Bentley, Ferrari, Lamborghini, Maserati, and Aston Martin ECU repair. We also service domestic vehicles, heavy equipment control modules, and marine electronics systems.
Why Shops and Owners Choose Us
Fast Turnaround — Most ECU repairs ship within 2–3 business days. Same-day rush service available.
Plug-and-Play Ready — Every module leaves fully programmed and coded to your vehicle. No dealer visit required.
Direct Communication — Text or call us and speak with a real technician. No ticket queues, no waiting.
6-Month Unlimited Mileage Warranty — Drive with confidence. Our warranty covers you regardless of how many miles you put on.
Our Commitment
We exist to keep your vehicle out of the dealership and back on the road—with reliable repairs, transparent pricing, and expert support from start to finish. Every job receives the same attention we'd give our own vehicle.