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. Poor key fob / keyless entry range – The doors’ key lock and unlock signal is transmitted via the rear antenna.Fuse Keeps Blowing – If you have a fuse that keeps on blowing, it is possible that the SAM module is defective and needs to be replaced.You should always avoid splicing wires to get power for aftermarket HID lights, alarms, or connecting a trailer hitch. It can be that the left or right low beams, fog lights, or turn signals may not work. Lights are not working – We have seen many Mercedes-Benz where one or a few lights don’t work.From here, the fuel level data can be sent to the instrument cluster or the engine control unit for computing the remaining distance based on fuel level. The signal on Mercedes-Benz must be sent to the rear SAM since it is the closest unit in the Controller Area Network. In cars without CAN / SAM, the signal is sent directly to the instrument cluster via two wires. Fuel Level / Gauge not working – The sending unit installed in the gas tank records the fuel level.Here are a few problems caused by a bad SAM unit: SAM units don’t frequently fail unless there is water intrusion or other problems. All systems on a Mercedes-Benz are controlled via CAN Bus and SAM units any issue you may experience could be due to a defective SAM unit. This is a list of a few possible SAM-related problems.
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