Day Time Running Lights Staying On And Brake Lights

Randy Diagnostician Glendora, California Posted   Latest   Edited  
Question
Electrical
Network Communications
2010 BMW 325i 2.5L (N52KB25) 6-spd
Footwell Module

Have this bmw replaced fuse box due to clicking and day time running lights and brake lights staying after you turn key off .replaced fuse box under dash. All was good for one month . Now doing same thing. Frm module right ? Told customer original I thought it was the frm module butt he choose to do fuse box. Fuse box new from bmw . Can a used frm module work ?? And does it have to be programed or coded . And was is the easiest way to do it ??

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Justin Technical Support Specialist
Fresno, California
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There is campaign coverage on this vehicle to 10/156k miles for all mini and bmws utilizing FRM. They are known to commit suicide. The most common method of death is battery disconnects before the vehicle has completely gone to sleep. If the vehicle is under on mileage and it’s no comms lights in limp mode and windows Inop send to dealer for free replacement SIB 01 20 16 last updated aug 2018…

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Randy Diagnostician
Glendora, California
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out of warranty

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Justin Technical Support Specialist
Fresno, California
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NEW module, and yes it will require programming, so to confirm this car has more than 156,000 miles on it? But I do not believe this is the cause of the problems you have. I'd highly recommend you start monitoring the 15 circuits I listed above and watching them for pulsing which is a sign of failed CAS module due to the micro relays soldered to the board failing. CAS will repeatedly reset…

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Justin Technical Support Specialist
Fresno, California
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Normally in this situation you would also have faults in CAS for some of if not all the 15 circuits. This isn't a steadfast 100% rule, but based on my experience 80% of the time you have terminal 15 faults in the CAS , JBE, FRM, and various other body modules.

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Randy Diagnostician
Glendora, California
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no codes

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Randy Diagnostician
Glendora, California
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But car does turn on and start . Just lights do strange stuff . Hot or cold

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Justin Technical Support Specialist
Fresno, California
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the CAS module has multiple t15 circuits, IF the relays in the JBE are still clacking away after you turn the car on, you need to verify the 15 circuits from the CAS module. The JBE is responsible for power on most of the car, but only after it is turned on by the CAS.

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Justin Technical Support Specialist
Fresno, California
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previously when you replaced the junction box did you replace just the fuse box portion or the JBE module portion?

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Randy Diagnostician
Glendora, California
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just fuse box

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Randy Diagnostician
Glendora, California
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And fuse box only clicks with key off

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Randy Diagnostician
Glendora, California
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And if I un plug the jbe module it still clicks

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Justin Technical Support Specialist
Fresno, California
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And it still has the relay clicking situation?

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Randy Diagnostician
Glendora, California
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Yes. Like I said replaced fuse box and all was good for a month

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Justin Technical Support Specialist
Fresno, California
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I stand by my original suggestions, Test the 15 LSZ 15 JB and 15_1 circuits to verify they aren't wigging out, they should either be on or off, not pulsed. I full expect you to find your issue when monitoring those circuits which originate at the CAS. But again, if you wish to replace the FRM and its out of warranty extension, it will need a new module, and it will require programming and…

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Randy Diagnostician
Glendora, California
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Thanks justin I will check tomorrow. And great videos on uscope operation

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Jeff Owner/Technician
Baldwinsville, New York
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I had a very similar symptom on a BMW and you are going to think I crazy when I say this, but disconnect the headlight level sensors wire connectors and see if that fixes the problem. The level sensor shorts internally and causes the parking lights to stay on and a few other odd things to stay awake. The car I had this issue ended up being the right rear level sensor.

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Randy Diagnostician
Glendora, California
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Disconnected battery last night because lights would not shut off. Hooked battery back up and now problem is gone.

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Jason Technician
Hawthorne, New Jersey
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Hey what's going on Randy. This is a very interesting conversation u guys were having. Justin is a really smart dude. So I'm just curious...... did ur problem go away with the battery disconnected overnight?

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Randy Diagnostician
Glendora, California
Randy Default
 

Driven the car for two days about 1 hundred miles and all is still well . But the problem I now will return .

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Jason Technician
Hawthorne, New Jersey
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Thank u

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