The black control unit in the middle is the REM module,,,Rear Electronic Module,,,this was on a 2015 328gt,,,,the REM controls all the electrical in the rear of the car,,,,tail lights, fuel sender, all the window and rear door locks,,,,customer said the rear tail lights were inop and check engine light was on,,,,checked faults found all rear lights were inop,,,and for the check engine light,,,,there were no engine faults,,,,but there were fuel sender faults for both fuel sensor,,,,that’s what caused the check engine light,,,,while I was checking the faults the REM was died,,,I couldn’t communicate with the module,,,,I did unplug all the connectors and waited 5 minutes,,,,,and reconnected and the module came back to life.
Here the old one on top and new one on the bottom,,,I like to match them up to make sure I got the right one,,,even though the old one started to work,,,,I decided to replace it so the customer wouldn’t have the same problem,,,replacing it was easy,,,it was just in the right rear storage compartment panel,,,you have to program and code this module.
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When unplug rem and put again.. Need or reset.
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If you unplug and plug the REM module back in no need to reset,,,,,question did you replace it with a new one or used one from another car,,,,,if it is a new one it needs to encoded to the vehicle ,,,,if it is a used one from another car it will not work in your car.
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Tq for reply . I dont change again but need inform..my costumer bmw model f20 1 series.. Have problem one side reverse light right side not working. When i checked bulb is ok. But No voltage when . When i checked socket is ok connector ok . wire from The rem side.. But. I can entering this unit. With my scanner. My question is rem problem or this model only work with one lamp reverse .. Or rem unit problem.
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Both rear reverse lights should work,,,,are the fuses ok,,,,you might have a bad REM,,,,did you check the ground wire?
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Tq for reply . I dont change again but need inform..my costumer bmw model f20 1 series.. Have problem one side reverse light right side not working. When i checked bulb is ok. But No voltage when . When i checked socket is ok connector ok . wire from The rem side.. But. I can entering this unit. With my scanner. My question is rem problem or this model only work with one lamp reverse .
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I dont change again but need inform..my costumer bmw model f20 1 series.. Have problem one side reverse light right side not working. When i checked bulb is ok. But No voltage when . When i checked socket is ok connector ok . wire from The rem side.. But. I can entering this unit. With my scanner. My question is rem problem or this model only work with one lamp reverse .
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Ground wire is ok because i used multimeter. Just positif voltage. No voltage
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That’s strange that’s only the 1 reverse light isn’t working,,,,when a REM module goes bad a lot of thing usually don’t work,,,,have you tried to put power to the power wire for the bulb and ha be it light up
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Yes.. I think. Same with you if rem problem maybe all system will be not work but if only one circuit reverse right line problem example resistor or capacitor or silicon control rectifier in rem. Will be not work just this line im not open yet.. Check and trouble shoot this rem unit
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Like I said can you put 12volts to the power wire for the reverse bulb that’s not working to make sure it lights up
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When put 12 volt is ok.
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Even when you put 12 volts to it the REM still did not work
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My module is dead, can you tell hpow to program the used one ?
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Sorry I don’t think you can reprogram a used REM module,,,,the old VIN number is stored in the used module and it won’t over write during programming
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Does a new one need just coding, or programming AND coding?
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Yes it needs programming and coding
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