No it’s the sensor array that tells the computer that the gearbox is in the gear it commanded. It was a logical assumption that the displayed gear is actually what the sensor said it was, but based on the video from Platti, that can’t be since it wasn’t hooked up. Therefore it’s the requested gear, although there’s probably logic that says at some point if the commanded gear and sensed gear don’t match then throw a code and flash the gear display value. I don’t think BMW will tell is the control logic, but we can deduce that from these observations.So i guess the gear position sensor is for the purpose of illuminating the shifter. Is that correct?
Yes it goes to the transmission through the SMG ECU to execute the command not through the engine ECU, at the same time the a signal will go to the display in normal operation mode, In ISTA/INPA manual selection mode the position is sent to the display by the software.So when I change the gear through software (INPA or ISTA) commands are sent through the SMG ECU to the transmission. Those commands are shared with the dash either directly or through the engine ECU.
No, the gear position sensor signal go only to the SMG ECU for gear position recognition.So i guess the gear position sensor is for the purpose of illuminating the shifter. Is that correct?
Correct and they are not very descriptive, but they are the sensor 5V power. They are the source of power to the gear position and clutch sensors.fault code 5104 and 5105 are for the power supply of system sensor A and system sensor B. System Sensor A, B are not very descriptive. Are these the clutch and gear position sensors?
Re-repair the gear position wiring harness especially if it is shorted, because it has 5V and ground in those 9 wires, this may be your problem. Test for 5V and ground at the corresponded pins on the other side of this connector that comes from the ECU, if you have 5V power and ground, then the gear position harness is shorted and you need to repair it before going forward and solve your malfunction so far.when you say 'or simply re do it.', what do you mean?
pin 3 get 5V power from SMG ECU pin 34.I know Platti said pin 3 and 4 get 5V power from SMG ECU pin 34
Pin 3 and Pin 4 use different 5V channels, they shouldn't touch each other.CORECTION: There three pairs of pins with connectivity. I looked at the connector on the 2006 SMG (not installed in car) through my reading glasses. The connected pin pairs are 3 and 4, 4 and 5, and 7 and 8. And I can wiggle the connector around to make the connectivity intermittent. So should there be any connectivity between these pin pairs or is this a definite problem?
You have a problem for sure in the wiring. In fact you should not have any continuity between the pins of the Gear position sensor (sensor side plug) in the total 9 wires, the fact is that pin 4 connect with pin 1 and and 9 internally as per the diagram (there is no wire for them in the plug X016). I physically confirmed on both gear position blocks I have.CORECTION: There three pairs of pins with connectivity. I looked at the connector on the 2006 SMG (not installed in car) through my reading glasses. The connected pin pairs are 3 and 4, 4 and 5, and 7 and 8. And I can wiggle the connector around to make the connectivity intermittent. So should there be any connectivity between these pin pairs or is this a definite problem?
Interesting thoughts.The dash shows the requested gear. Blinks if shift is in process/delayed. Surprised gm didn't realize that since dash changes instantly with paddles/shifter. Or even worse you hit paddles then look down and dash hasn't changed yet so you hit it again and now you're not going to the gear you wanted...