04-16-2016, 08:06 PM | #1 |
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Odd Behavior after Read-End Collision
My wife was read-ended in the 2012 328i today. It was a moderately hard hit. The rear bumper is compressed, and there's some denting around the lower part of the trunk. Nothing unexpected, and I would have expected it to still be drivable. She is a little shaken, but otherwise fine.
Problem is, the car would not start afterwards. The brake pedal was partially depressed and hard. And we could not put the car (auto) into neutral. It had battery power, so I suspect both the failure to start and the transmission issue may have been due to a problem with the brake interlock for both. So, is this normal behavior? It was inconvenient at best. What should have been a "drive to the body shop on Monday" problem became a towing problem. The tow truck driver had to spend some time getting the car on and back off the flat bed. At worst, it was dangerous, because she could not move the car out of traffic until the police and tow truck arrived. |
04-16-2016, 11:56 PM | #2 |
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Sounds like the collision got into the exhaust and that potential caused some other chain reaction damage. Happened to my dad in his X5. Of course it's only speculation on my part. Sounds like you need to just find a local body shop to get it figured out for sure
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04-17-2016, 12:35 AM | #3 | |
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In our case, the engine won't even turn over. Also, I forgot to mention that it gave a "chassis stability" warning when we tried (and failed) to start it. It's sitting at the BMW dealer's body shop, waiting for people to show up Monday morning. |
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04-17-2016, 12:56 AM | #4 | ||
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04-17-2016, 01:31 AM | #5 |
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I just experimented with my car (an M235i), also with auto. You cannot move it from park to neutral if the engine is not running. That seems to me to be a safety-impacting design flaw: if the engine won't start, you cannot move the car.
How are you supposed to tow these cars without damaging the transmission? |
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04-17-2016, 05:10 AM | #8 | |
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Driving > Steptronic transmission > Unlocking transmission lockout electronically meant to move the car even if the engine does not start again. A six step procedure... I wonder how one is supposed to remember all this after an accident! If you have an iPhone you can keep there a full searchable manual for any recent BMW car by first dowloading a "Driver's guide" app, then follow easy instructions. |
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04-17-2016, 09:11 AM | #10 | |
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04-17-2016, 12:59 PM | #11 | |
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04-17-2016, 01:13 PM | #12 |
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04-17-2016, 01:18 PM | #13 | |
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But seriously? I can imagine a few situations where that would be a good thing--but a lot more (like this one) where it would not. That reminds me; she says the SOS system activated, but never got a person on the other end. |
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04-17-2016, 01:26 PM | #14 | |
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It seems like if the battery cutout that tturedraider mentioned activates, one would never be able to get the car out of park. If I understand things correctly, this is a pretty serious safety issue. |
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04-17-2016, 01:34 PM | #15 | ||
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If there was airbag deployment that does seem like the likely cause. OP unless this was a big big rear end accident, the battery charge should not have tripped. Last edited by //M; 04-17-2016 at 01:41 PM.. |
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04-17-2016, 01:39 PM | #16 |
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Nope, if it got into the brake lines the pedal would go soft not hard. What he's describing is the absence of the brake booster, the brake booster uses vacuum from the engine it also has a very small internal Reservoir that will allow assisted braking with the engine off one or two times. I'd assume his wife press the brake pedal a couple times trying to get it into neutral.
Is the shift lever still in Drive, if so that's why the engine won't start. I wouldn't worry about the brake pedal unless it stays hard once the engine starts. |
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04-17-2016, 01:59 PM | #17 | ||
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I, too, often wondered about safety. An assailant would only need to rear end the bimmer and presto the explosive charge renders the bimmer inoperable. Plus, the doors will automatically unlock to help the assailant even more. |
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04-17-2016, 01:59 PM | #18 | |
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04-17-2016, 02:01 PM | #19 | |
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04-17-2016, 02:07 PM | #20 | |
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Would the air bags deploy on any read end collision? (Assuming no secondary collisions). I don't know if the other driver's air bags deployed. |
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04-17-2016, 02:11 PM | #21 | |
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"Electronic unlocking of the transmission lock General information Electronically unlock the transmission lock to maneuver vehicle from the danger area. Unlocking is possible, if the starter can spin the engine. Engaging selector lever position N 1. Depress the brake pedal. 2. Press the Start/Stop button. The starter must audibly start. 3. Press and hold the selector lever into position N. A corresponding Check Control message is displayed. 4. Press the selector lever again into position N within approx. 6 seconds. Position N is displayed in the instrument cluster. 5. Release brake, as soon as the starter stops. 6. Maneuver the vehicle from the danger area and secure it against moving on its own." |
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