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Old 09-22-2023, 11:02 AM
Join Date: Mar 2019
Location: Atlanta GA
Posts: 116
nextelbuddy is on a distinguished road
what is the "turn key once to start" feature called?

i'm very used to e46 where you hold the key in position III to start. when i got my e53 4.8is in 2019 it caught me off guard when i turned the key once and had to let go and it still cranked on its own.

i was curious how this works or what its called? i would love to research the wiring for it more due to my curiosity.

its almost like a push button start but in key form
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Old 09-22-2023, 12:02 PM
workingonit's Avatar
Join Date: May 2021
Location: DFW Texas
Posts: 790
workingonit is on a distinguished road
from the 2001 owner's manual:

BMW X5 4.4i:
Your BMW is equipped with the convenience
starting feature. Simply turn the
key to position 3 (starter) and then
release it immediately.
The starter continues to operate automatically.
The automatic starting mode will not
operate if the battery voltage is low.
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

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Old 09-22-2023, 05:39 PM
Join Date: Jan 2013
Location: Finland
Posts: 1,405
Clavurion is on a distinguished road
Automatic start. A separate relay on the starter activation line. Can only be implemented with certain engine control unit versions.

E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
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Old 09-24-2023, 09:13 AM
Join Date: Jun 2021
Location: Austin, TX
Posts: 1,565
X5chemist is on a distinguished road
Auto start is what most manufacturers call it. My '08 Nitro had it. Goes back to an '04 Benz C240 too. It's been around for a while. If you hold the key, the ECM on most cars will cut fuel to keep it from starting.
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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