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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 03-21-2014, 06:48 AM
rmjames007 rmjames007 is offline
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Z4 won't start

I went to go crank up the Z4 in the garage and the battery was drained low. So I charged it over night and now the car comes on but it won't crank at all.

Anyone else had this happen?

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  #2  
Old 03-21-2014, 08:58 AM
coolvt coolvt is offline
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See if you have bright headlights. That will tell you if your battery is strong. Before replacing the battery you might check the battery terminals and make sure they are shinny clean. After cleaning, try starting again. If it won't crank try charging again. But normally if you have bright headlights then your battery should be strong enough to crank the engine. Charing the battery is a good try, but if the battery is shot it won't hold a charge.
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Old 03-21-2014, 02:47 PM
kalali kalali is offline
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You need to have the battery load tested. It might be strong enough to power the headlights but still marginal to start the engine. You also need to find out why the battery was drained in the first place.
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  #4  
Old 03-21-2014, 03:01 PM
coolvt coolvt is offline
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Good advice Kalali. I've had a few ocassions where I tapped the terminal with a hammer, the contact was renwed and the vehilce started. And this when the terminals appeared clean. So I think the first thing is to be sure you havef shiney clean terminals. Hopefully the battery is fine. If you discover you need a battery, look back on this site for good informaiton on saving money on a battery replacement.
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  #5  
Old 03-21-2014, 04:19 PM
rmjames007 rmjames007 is offline
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I don't know think a light got left on. Gonna check voltage on the battery and see.

If I need a new one do I have to get it registered ?

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  #6  
Old 03-21-2014, 04:30 PM
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shipkiller shipkiller is offline
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[quote=rmjames007;8226329if i need a new one do i have to get it registered ?[/quote]

no.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #7  
Old 03-24-2014, 06:27 AM
rmjames007 rmjames007 is offline
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So I put in a new battery and i am still getting the same issue. I was talkng to a BMW friend of mine and he said here are some possible issues

Here are the 4 likely causes that can occur after a dead battery:

Corrupt random key code from dead battery?
Bad key?
Starter relay failed in EWS?
Bad engine to chassis ground?
Failed starter?

Here is a link to a video capture of the issue
https://drive.google.com/file/d/0B-F...it?usp=sharing

Thanks for the responses
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  #8  
Old 03-24-2014, 07:28 AM
coolvt coolvt is offline
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RMjames. I think you are going to have to bite the bullet and get a decent mechanic look at the car.
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  #9  
Old 03-24-2014, 08:23 AM
rmjames007 rmjames007 is offline
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I think so too. Scky part is that I am prolly gonna have to get it towed to BMW. The car is under warranty since I just purchased it so I am hope its covered.
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  #10  
Old 03-24-2014, 08:40 AM
coolvt coolvt is offline
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Check the warranty. If used and older than 4 yrs. is it "certified"? If not, maybe they gave you a 90 days bumper to bumper? If it's under warranty don't even fool with it. I think they should pick it up and fix it. Check on the towing in the warranty.
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  #11  
Old 03-24-2014, 08:58 AM
rmjames007 rmjames007 is offline
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Actually just speaking with my SA at hendrick It went out of preowned warranty after feb 2014. That sucks
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  #12  
Old 03-24-2014, 06:02 PM
rmjames007 rmjames007 is offline
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I got the car working! I switched out the battery and got nothing. So I called my mechanic friend and he said to check voltages and try a different key. I put in the spare key and it cranked up fine.
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  #13  
Old 03-24-2014, 06:20 PM
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dc_wright dc_wright is offline
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I've seen this happen a couple times on E36s under similar conditions. There are two codes in each key, a "car code" that's common to all the keys for the car and a "key code" added to the car code so you can have key specific features like individual driver auto adjustment of the seat/mirrors. The key code in the EWS for the key in the ignition when the battery dies gets corrupted and it no longer recognizes that key. Sounds like this is what's happened to your first key and it likely won't work again. The fix in these other instances has been to use another key and purchase a replacement for the "bad" key.
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  #14  
Old 03-24-2014, 06:51 PM
rmjames007 rmjames007 is offline
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So would I have to buy a new key?
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  #15  
Old 03-24-2014, 07:05 PM
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dc_wright dc_wright is offline
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That's been the fix on the E36s. Have you tried the original key again to see if it will start the car now that it's been started with the 2nd key? I'm betting that it still won't work and if that's the case then yes, new key required.
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Old 03-24-2014, 07:18 PM
rmjames007 rmjames007 is offline
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Your correct after I started and ran the car on the working key. I put the bad key in with no work

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  #17  
Old 03-24-2014, 07:46 PM
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All it takes is one bit getting switched in the EWS memory to make the key inop.
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  #18  
Old 03-24-2014, 08:24 PM
siegrw siegrw is offline
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You may be able to have the bad key reinitialized. The code is different for each model, but check the forums. I've had several people give me a code for specific keys. If that doesn't do it, the dealer will probably initialize the key for you. Good luck
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  #19  
Old 03-25-2014, 07:24 AM
coolvt coolvt is offline
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Lets's face it. A strange way to build a car. And BMW isn't the only company to do things like this.
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  #20  
Old 03-25-2014, 09:36 AM
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Just initialize the keys yourself.

Key Initialization
Initialization of FZV keys is required to establish lock/unlock signal synchronization with the GM V. The initialization procedure provides the GM V with a key identification number and a "rolling code" for each key. If initialization is not performed, the GM V will not respond to the key signals.

Up to 4 remote keys can be initialized. They must be initialized at the same time. Key initialization is only possible with the vehicle unlocked.

Note:
The Key Memory function of the GM responds to the key identification number of each key. If the keys are not initialized in the same order prior to initialization, the key memory functions activated by the keys will not be assigned correctly. Always initialize the keys in the same order.

- Close all doors and have all keys available.

- Using key number 1, turn the ignition switch to KL R (accessory position), then switch off within 5 seconds and remove the first key.

- Within 30 seconds of turning the ignition switch to OFF Press and hold button #2

- While holding button #2, press and release ("tap") button #1 three times within 10 seconds.

- Release both buttons. The GM V will immediately lock and unlock the doors signaling a successful initialization.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #21  
Old 03-25-2014, 12:58 PM
rmjames007 rmjames007 is offline
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what is button 1 and button 2 on the key?

and what position is accessory

Last edited by rmjames007; 03-25-2014 at 01:22 PM. Reason: more stuff
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  #22  
Old 03-25-2014, 01:49 PM
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Does this help?
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__________________
.
.
How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #23  
Old 03-25-2014, 03:53 PM
rmjames007 rmjames007 is offline
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And the acessoy position on the car

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  #24  
Old 03-25-2014, 08:58 PM
druii85 druii85 is offline
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same issue, just got fixed here is the detail

hi, i have similar issue, here is the detail, hope it helps
2003 bmw z4 3.0, can not start during one rainy day. jump start, drive back home, thought bad battery, so I bought an new battery, replaced, runs fine. 3 days later, can not start, crank but not start up, light not bright, indicate low battery which means my new battery is drain.
Thought code issue, so bring car to dealer, reprogram and register the alternator and battery, good, runs good, 3days later same issue happened again.
bring car back to dealer, nothing found, finally change alternator and new battery from dealer, cost me 1400, runs fine now. hope it is good info for you.
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  #25  
Old 03-25-2014, 09:20 PM
rmjames007 rmjames007 is offline
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Well as of now both keys dont work. Went and did the registration procedure correctly but that did t help the ignition issue. I am gonna get it towed to bmw so the can look at it.

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