Bike starts without pushing start button - BMW R1200GS Forum : R1200 GS Forums
 
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post #1 of 8 (permalink) Old 08-Dec-2019, 10:04 PM (169) Thread Starter
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Bike starts without pushing start button

Hi All, my first post here.

I have a R1200GS 2005 which starts as soon as the ignition is switched on.

Interesting thing is that with the 911 diagnostic tool connected it works fine (switch starts the bike and it runs OK, so eliminates a possible short circuit starter switch)

I have not looked at any fault codes yet. Anyone come across this.
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post #2 of 8 (permalink) Old 09-Dec-2019, 01:55 AM (329)
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I had a similar problem with my Victory when water got inside the switch. Best I can do for help.

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post #3 of 8 (permalink) Old 09-Dec-2019, 04:14 AM (426)
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Check your start switch/ wiring sounds like a short to me. Could be the switch unit itself or in the wire harness.
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post #4 of 8 (permalink) Old 10-Dec-2019, 12:12 AM (258) Thread Starter
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Thanks for the replies. I think the switch is OK as with the GS-911 tool connected it works OK. Have to press the switch to start.
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post #5 of 8 (permalink) Old 11-Dec-2019, 05:06 PM (962)
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Originally Posted by toddy123 View Post
Thanks for the replies. I think the switch is OK as with the GS-911 tool connected it works OK. Have to press the switch to start.
Check the relay under the seat for corrosion. Happened to a buddies bike in the middle of nowhere half way between Churchill Falls and Goose Bay. We wired up a switch to break the contact and carried on.
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post #6 of 8 (permalink) Old 11-Dec-2019, 06:19 PM (013)
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Had similar problems on a K1600. Was. Faulty starter solenoid, under the seat. Could be...

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post #7 of 8 (permalink) Old 11-Dec-2019, 09:22 PM (140) Thread Starter
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I suspected the relay, replaced it, still the same.
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post #8 of 8 (permalink) Old 15-Dec-2019, 09:08 PM (130) Thread Starter
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After studying the schematic, discovered that you can bluff the ECU into thinking that there is a GS-911 diagnostic tool attached, bypassing the errors.
Taking pin 1 on the diagnostic tool socket to 12 volts does this, I connected to 12 volts via a 10 K ohm resistor (I wouldnt recommend connecting directly), bike now starts OK. Picture attached.
Still have the underlying start issue which is now masked, but at least the bike works, CAUTION be aware if you do this, the clutch in and stand down switches are bypassed.
This info could be a life saver if stranded in the "bush" with a sensor problem preventing the bike from starting.
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