Some earlier Aston Martin DB11 master light switch assemblies can develop a mechanical failure where the rotary switch becomes loose, damaged, or detached. Aston Martin formally documented the condition and an approved structural repair in Service Bulletin SB-18-1713.
Overview
The bulletin describes a failure affecting the rotary light switch and its connection to the master light switch assembly. The condition can progress from movement or looseness to partial or complete separation, with the fog-light switch centre also becoming detached.
The bulletin covers DB11, DBS, and Vantage vehicles. The exact DB11 production range covered by the repair should be confirmed against the vehicle identification number before ordering parts or booking work.
Symptoms
Owners and the bulletin describe signs such as:
- Loose movement in the headlight rotary selector
- Movement or insecurity in the chrome or outer bezel
- A loose fog-light button, core, or centre section
- The switch centre falling out or becoming partly detached
- Physical separation of the switch assembly
- Exterior lighting controls becoming difficult or impossible to operate
Official Aston Martin bulletin
Aston Martin Service Bulletin SB-18-1713, titled Rotary Light Switch Repair Process, was issued on 10 January 2023. The bulletin covers the DB11, DBS, and Vantage and sets out the official repair procedure.
Use the local copy as the primary link so the bulletin remains available if the external archive changes. The original NHTSA-hosted document remains available as a secondary source.
Rotary Light Switch Repair Process
Issued 10 January 2023
Covered models: DB11, DBS, Vantage
Bulletin labour: Approximately 0.25 hours of repair labour
Aston Martin repair
The official repair reinforces the damaged plastic mounting areas rather than treating replacement of the complete master light switch assembly as the only option. The procedure involves removing or machining the damaged plastic areas and fitting a reinforcing horseshoe bracket behind the switch using longer screws.
Aston Martin specifies workshop tool 43-28904 as the alignment or milling tool for the repair. The bulletin gives approximately 0.25 hours of repair labour. That figure should not be read as a guaranteed total: diagnosis, vehicle strip-down, administrative labour, and other dealer charges may sit outside the repair operation.
Owners and independent specialists should consult the full Aston Martin bulletin before attempting the repair. This article does not replace the workshop procedure or turn it into an unofficial step-by-step guide.
| Component | Part number | Detail |
|---|---|---|
| Master Light Switch Horseshoe Bracket | MY53-13B738-AA | Reinforcement bracket fitted behind the switch. |
| 19 mm screw | MY53-N907009-AA | Quantity 2 in the repair parts list. |
| Workshop jig / milling tool | 43-28904 | Aston Martin alignment / milling tool specified for the repair. |
Why this matters
A failed switch can make the car inconvenient to use and may prevent required exterior lighting functions from being operated correctly. A repair that avoids replacing the complete master light switch assembly may reduce parts cost and disruption, but the right route still depends on inspection, VIN compatibility, and the condition of the surrounding housing.
Later switch design
Later DB11 cars use a different switch arrangement associated with the later Aston Martin and Mercedes-derived switchgear architecture.
We have not found Aston Martin documentation confirming that the later switch assembly is a direct retrofit for earlier DB11 vehicles. Do not buy a later unit as a replacement without confirming compatibility against the vehicle identification number.
Root cause
The bulletin identifies the damaged or detached rotary switch and provides a structural repair, but it does not identify a definitive root cause.
Confirmed facts
Aston Martin documents the damaged, loose, partially detached, or detached rotary light switch condition and the reinforcing-bracket repair in SB-18-1713.
Observed owner reports
Owners have reported a loose rotary selector, an insecure bezel, or a fog-light centre that detaches.
Unverified hypotheses
Possible degradation of the plastic mounting bosses and possible contamination have been suggested in owner discussion, but the bulletin does not establish either as the cause.
MOT considerations
A detached or inoperative lighting switch can result in an MOT issue where required lamps cannot be operated correctly. This is a practical inspection concern, not a legal conclusion about any individual car or a substitute for an official test result.
What owners should do
If the switch feels loose or a component is moving:
- Inspect the switch for movement or loose components.
- Do not immediately assume the complete master light switch must be replaced.
- Give the repairer a copy of Aston Martin SB-18-1713.
- Ask whether the MY53-13B738-AA reinforcement repair is appropriate for the car.
- Confirm compatibility against the vehicle VIN before ordering parts.
Sources
The primary source for the documented condition and repair is Aston Martin Service Bulletin SB-18-1713, obtained via the NHTSA Technical Service Bulletin archive.
Frequently asked questions
Does this mean every early DB11 is affected?
No. The bulletin documents the condition, but it does not state that every early DB11 is affected. Confirm the car’s VIN and inspect the switch before assuming it needs repair.
Can the later Aston Martin switch be fitted to an early DB11?
We have not found Aston Martin documentation confirming that the later switch assembly is a direct retrofit for earlier DB11 vehicles. Check the VIN and compatibility before ordering a replacement.