DIY: Replace dreaded steering-lock on 2009s and early 2010s.

wstar

Well what I mean is, we don't really have to capture them, since they're documented and they have to come from the BCM because there's no other way it's signaling the module to make the change.

What I don't understand is whether the lock module also supplies voltage to this wire at times to provide feedback to the BCM or something.

One way or another, a replacement would need: a cheap microcontroller to sense the command pulses on the communication line and update a little NVRAM state indicating whether the fake lock is currently stuck-on or stuck-off, the microcontroller would need to be powered on any time either of the power supply pins lights up and provide S1/S2 feedback based on NVRAM, and possibly voltage feedback on the communication line as well.

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ChrisSlicks

I think the output voltage signal only needs to be supplied when the unit is in the powered state and that the unit can be power off pin 106. Pin 111 is also temporarily powered to 12V prior to any signal being sent.

One test that may be revealing is whether you can simply permanently send an "UNLOCKED" status voltage without throwing a terminal error (might show as a lock error but still allow you to start and drive). I wonder if failed units where not sending a voltage on either pin or registering "LOCKED".

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