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BMW 3-Series (E90 E92) Forum
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Door looks
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09-22-2015, 02:13 PM | #1 |
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Door looks
Hey guys I just got a 2008 335i my key fob won't lock or unlock the doors if I take the manual key from the fob and try it in the door nothing happens. I have replaced fuse 56&57 with 20 amp as per what I have seen done from this post.
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09-22-2015, 02:44 PM | #2 |
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The FRM actually monitors for the Hall sensor signal for the lock barrel in the driver door. A change of state in the Hall sensor, when the mechanical key is turned, initiates lock/unlock.
Downstream from the FRM (the CAS is parallel to the FRM, both upstream from the JBE) the JBE actually activates the lock actuators. You could suspect the FRM or the JBE (or the lockbarrel...but since the remote doesn't work either, it's not the lock barrell itself!) |
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09-23-2015, 08:16 AM | #3 | |
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09-23-2015, 12:29 PM | #5 |
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The FRM is a module located near the driver's left calf, so is the CAS. The FRM monitors the keyslot to see if a key has been inserted and the lock tumbler turned to lock/unlock, then it sends a message to the JBE module to send voltage to the lock actuators, which is what actually is the lock/unlock mechanism. So either
so the diagnosis is finding which of two modules (FRM or JBE), or which of two devices (tumbler electronics or lock actuator), or if the wiring in between any two of the four components... is bad. Since you said that the metal key does not unlock things, we don't need to bother (yet) with why the radio signal (between fob and car) works or doesn't work... we gotta get the most basic part to work first! As for patents' comment in post #4, the mechanical key has a chip in it with an ID code; so it is possible to somehow get a key (used car, y'know) which turns in the lock but has the wrong ID code...so the signal will not be sent to unlock your door! And someone has reported that their (non-CA) fob battery (rechargeable, gets charge while in the dash slot) had gone bad, and he had to buy a new fob from the dealer (which worked!)...trying to replace the rechargeable battery (eBay) himself failed to get his fob functional again. Last edited by Wilt; 09-23-2015 at 12:46 PM.. |
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09-23-2015, 12:38 PM | #6 |
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this is actually not true, mechanical blade should open car even without battery
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09-23-2015, 02:36 PM | #8 |
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09-23-2015, 03:04 PM | #9 |
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So the dash locking button works and locks the car but use ing the key will not also my fuel door now won't stay latched! I'm getting frustrated already
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09-23-2015, 04:34 PM | #10 |
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Does the mechanical key rotate in the lock at all? If it doesn't, then either the lock is physically broken (or stuck or whatever) or your key is not cut to fit that lock.
Does the key fob start the car? If the mechanical key won't turn and the remote doesn't work, those are two separate issues. Unless you were given the wrong key. It happened to me when I bought my car. The seller (individual) swore the second key he gave me fit my car. I ended up taking the key to a dealer and asked them what car it went to. They popped it in their computer and it came back to a gray 135i, which happened to be the seller's other car. I ended up getting the right key. You may have gotten a key fob that goes to your car with just a dead battery and someone had put the wrong mechanical key in it. If the battery is dead, use that key and drive around for a bit to charge it. |
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09-23-2015, 04:39 PM | #11 | |
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Battery dead, FOB sat to long?
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09-23-2015, 06:44 PM | #12 |
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The key will turn in the doors just not lock them. I always drive with the fob in the dash so I figured its charged. Now my fuel door won't stay latch is it the same system
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