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The light grey relay is located adjacent to the blue fuses. I indicated that the fuse box diagram is orientated for a left-hand drive vehicle.

What symptoms are you experiencing?

Orienting AMGeed's diagram enhances clarity: Relay N in your fusebox is the light grey component on the left in your image.

Greetings, I apologise for the interruption once more. I accessed the fuses in the driver's side engine compartment; but, the fuse schematic you provided does not correspond with the diagram I own. Could you identify relay N in the attached photograph? Thank you once more, my friend.

https://mercservicing.co.uk/

To my knowledge, substituting the relay is a straightforward exchange. No programming necessary. It may be necessary to erase the codes using your reader, thereafter restart the vehicle after replacing the relay, and anticipate that this resolves the problem. If issues persist after replacing the relay, contact Terry Gates in Harrow. A highly regarded Mercedes specialist.

I greatly appreciate it. Briefly, will replacing this fuse resolve the issue? 1. Eliminate the fault codes I own. 2. Upon replacement, must I reprogram it, or is it merely a straightforward exchange assuming I obtain the correct part for my vehicle? Thank you

https://fuse-box.info/mercedes-benz/mercedes-benz-c-class-w205-2015-2019-fuses-and-relay

Navigate to the Fuse Box located in the engine compartment, where Relay circuit 87 is designated as "N" in the provided link. Note that the diagram pertains to a left-hand drive vehicle, hence all components are mirrored, including the fuse box located on the driver's side. I would begin by substituting the relay, erasing the codes, and then observing if the error reoccurs.

Greetings, everyone. My Topdon scanner displays the codes U208487, P069500, and P065800. I am uncertain whether they are connected, as it states 'the output for relay circuit 87' and 'communication with radiator shutter 1 has a problem.' Is the radiator shutter issue attributable to this relay, and if so, where is relay 87 situated? My vehicle is a 2016 manual Mercedes C200d with a 1.6-liter diesel engine. If anyone had information or experience about this matter, your assistance would be greatly appreciated. Thank you very much.

resolved The problem was a faulty engine ground. I utilised some welding ground cable and established grounding at several spots, and now everything is functioning properly.

All terminals and wires appear to be in satisfactory condition; I will utilise a voltmeter tomorrow to ensure everything is functioning optimally. The only noteworthy observation is that when I connect a wire, touching one end to the earth and the other to the engine block, a little spark occurs. This suggests that I may need to reposition the earth strap. I fitted it by connecting it to the gearbox mount on the body side and then to the actual gearbox housing.

Are the battery terminals and posts clean and secure, and are the wires in satisfactory condition?

Initially, I suspected the battery; however, connecting the jump pack directly to the battery does not initiate the start. Conversely, attaching the jump pack to the engine bay positive terminal and the body ground facilitates ignition. I am currently reconditioning the batteries.

I possess a 2007 W639 and have experienced an intermittent issue with starting when the engine is heated. It merely emitted a click, like to a depleted battery. However, if you kept the hood raised and attempted to start the engine every few minutes, it would gradually begin to turn over with the key, initially very slowly and for only a few revolutions, then increasingly faster and longer until it eventually began. The cold start was consistently satisfactory. The battery passed the test, however it was aged (the original from 2007); the earth strap and connections were satisfactory. The battery is located beneath the passenger seat, hence it was not subjected to heat soak from the engine impacting its performance. The initial concern was a 'lazy starter motor,' a common issue with certain brands, particularly BMW. However, I opted to replace the battery because (a) it was aged and (b) this solution was significantly more economical than purchasing a new beginning motor, which ultimately resolved the problem.dk: It has been satisfactory ever since.

I left the original earth strap intact and installed a new earth strap from the bell housing to the body, anticipating that an increased number of connections would yield improved performance.

Is it a foolish inquiry to ask if you removed the engine-body ground strap and cleaned the contact surfaces?

I possess a 2008 W639 model. A week ago, I encountered a starting issue characterised by a clicking sound. I successfully jump-started the vehicle, suspecting a depleted or low battery. The vehicle was operational and utilised as a delivery van throughout the day. After a few hours, the cluster ceased functioning, and the battery ultimately failed. A technician arrived, inspected the battery after a jump start, and confirmed everything was satisfactory; however, he said, "The engine-to-body ground connection is inadequate." Successfully established a connection from the engine block to the earth point beneath the bonnet as a temporary solution, and all functioned properly. Yesterday, I installed a new earth strap from the gearbox to the body, intending to remedy the issue; but, it did not work. Commenced examination for other concerns and discovered that the original earth strap from the engine to the body was in satisfactory condition. The sole method to initiate the van's engine is by utilising a jump booster cable connecting the engine's positive terminal to the body’s earth point. I have inspected the battery negative, and it is functioning properly; also, all ground connections in the fuse box appear to be in good condition.

Greetings and welcome.

Each E39 that is restored and maintained in operational condition brings me joy.

Greetings and salutations

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