The fuse box usually installs most SAM modules. Where is the SAM module located on a Mercedes-Benz? The location of the SAM module depends on the Mercedes-Benz chassis. That would be the same as connecting your printer directly to your computer via a USB cable. Not all cars have SAM & Controller Area Network. Think of CAN Bus as the ethernet cables and wi-fi that make your home network communication possible. You may also hear the term CAN Bus which stands for Controller Area Network. If you hit print on your PC, the data (signal) gets sent to your network printer via the wireless router (SAM unit). All your devices, network printers, phones, and computers (switches, window motors, sensors, etc.) communicate via your router. Before you replace the front SAM module, check the water valve (the changeover/duo valve) first. Mercedes Blowing Only Cold Air – This problem could be caused by a defective front SAM module.In this case, we are not getting any communication with the module, which is most likely an issue with the SAM unit. Center Dashboard Buttons don’t work – Currently, we are working on an S-Class in which all the center buttons ( hazard light, head restraint, AIRMatic switch, etc.) don’t work.Other symptoms of a bad rear SAM include doors showing open all time, even when closed. Taillights staying on – If one or both of your tail lights stay on constantly, your rear SAM unit may be defective.Other possibilities, such as a defective audio gateway unit or a bad power seat motor, should be eliminated. Battery Drain – A defective SAM module can cause battery drain when a Mercedes-Benz is parked overnight or for several days. Don’t use a higher ampere rating fuse to try to fix this problem. Especially if you replace the fuse and it keeps on blowing. If this is your dilemma, you may notice a blown antenna fuse. The antenna is connected to the rear SAM module, and a short in the wiring can cause damage to the SAM unit.
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