Notes on installing a trailer hitch - AH31.10-P-1000-02QA
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MODEL 209.4## (except 209.476/477) 1# with CODE 550 (Trailer coupling) without CODE 772 (AMG styling package - front spoiler, side skirts and rear apron) without CODE 950 (Sports package - EVOLUTION AMG)
As part of liberalization of EU regulations the legislator waives any requirement for an inspection of retrofitted trailer hitch (AHV) at an authorized technical inspection station (for example Technical Inspection Association).
Prerequisites:
- That the supplement "If installed at the plant" is entered in the vehicle documents (in number 33 to number 27: E1 00...)
- That a E1 test symbol is fastened to the trailer hitch
For older vehicles or trailer hitches, with national test symbol (no E1-test symbol), the installation test at an authorized technical test point (e.g. Technical Inspection Association) continues to apply.
The diameter of the coupling ball, measured with a caliper gauge, must measure at least 49 mm at all points. The ball must be greased before use to reduce wear. Advise the customer accordingly.
Otherwise safety will be compromised.
On trailers with an anti-swerve device
it is not necessary to grease the ball (refer to trailer instructions). Advise the customer accordingly.
The customer should be asked to read the chapters entitled "trailer hitch" and "Trailer operation" in the vehicle's operating instructions.
The body sealant and underfloor protection must be removed from all the body mounting points of the trailer hitch. The mounting points should then be cleaned with a commercially available cleaning agent. Apply anticorrosion paint to bare-metal areas of the body.
Trailer hitches are homologated safety-related parts. Their installation on the vehicle is to be carried out exclusively by trained, professional technicians. Trailer hitches, which are damaged because of an accident, bottoming or being run into from behind, must be replaced; subsequent alterations such as bending, mechanical processing or welding are not permissible.
When retrofitting a trailer hitch on model 209.4, a 600 W blower motor may need to be retrofitted for the radiator. It should be checked in the EPC whether the electric fan fitted corresponding to the vehicle equipment can be used for retrofit of the trailer hitch (AHV). If necessary the electric fan should be removed and replaced by an electric fan which is compatible with the trailer hitch.
In the event that the listed component is not retrofitted this will render the warranty/goodwill null and void.
When retrofitting a trailer hitch on model 209.461 with code (423) with automatic five-speed transmission (NAG), and on model 209.475 a shield must be retrofitted to the solenoid switch of the starter.
In the event that the listed component is not retrofitted this will render the warranty/goodwill null and void.
Courtesy of MERCEDES-BENZ USA
Always remind the customer that fuse 18 in the SAM control unit with the rear SAM fuse and relay module (N10/2) should be inserted in its socket only when a trailer is actually connected.
Otherwise another electrical device could discharge the battery while the vehicle is at a standstill.