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Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3044
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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Have an 2006 m5 in our shop locked in 6th gear and rear

Customer Question

Have an 2006 m5 in our shop locked in 6th gear and rear wheels locked - was told by Autologic to test for power on pin 14 of the SMG control module.
Have a battery tender on battery- measures 13.2 volts. Pin 14 on SMG control module measures 11.2 volts. Should it be the same as the battery voltage? What should I check next
Submitted: 1 year ago.
Category: BMW
Expert:  Technicaldan replied 1 year ago.

Hi, I'll try to help you.

I've had a look at the wiring diagram for the SMG control module, pin 14 is '15WUP', essentially ignition on - wake up. I would expect this to be near battery voltage.

(diagram included with this message)

That wire seems to go back to connector X10547 somewhere behind the glove box, I've included another location diagram for you.

I would have a look at the connector, see if there is any damp or corrosion, I take it your car has the intelligent car access system, as it is this that supplies the power for the '15WUP' line.

If everything else is working fine then it is less likely that the issue is with the CAS module, as this supply would be for several systems.

Have you tried supplying battery voltage directly to the pin when the ignition is on with a piece of wire, through a fuse, to the battery to see if this is the actual issue?

Let me know how this goes.