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Is it a norm for Mercedes vehicles on their HFM to miss signals sent from other control modules? Could insufficient power supply lead to this?
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Not really a common problem, but as with any electronic component you can have errors/glitches with them, the HFM may very well be receiving the CAN signal from the IFZ but it may have a problem with processing the data, the HFM is basically a mini computer and we have all experienced that dreaded screen lock up on your home computer, you have to reboot, and away you go again. so i guess you could say it could be a similar problem, you have to turn the key off and try again (rebooting).
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So cutting connectors and soldering them directly; is this a customised modification or a normal "plan B" approach for rectification?
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the weakest link in any wiring loom is the connectors, but unfortunately it's near impossible for a car to be produced without them. most connectors are basicaly a female and male plug, the trouble with these connectors is they can become loose from heat stress causing bad earth/power problems, the quickest and most reliable solution is to remove the plug altogether and solder the wires directly.
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I still doubt that the ECU that is at fault here Everything performance and function are operating on a normal basis.
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remember earlier in my posts I wrote about how the HFM is always locked until it receives the CAN signal to unlock it, once it is unlocked it will function as normal with no problems at all, just like your computer wont work until you turn the power on.
over the border
