OEM Head Unit Reinstalled... Not Taking Code?

[bimmer4me]

I'm going retro with my '88 M3 and reinstalling the OEM CM5907 (Alpine) cassette/radio head. I've re-connected everything to the OEM fader switch and the OEM Blaupunkt amp (trunk-mounted... what a PITA to get at!). The fuses in the amp and the radio looked fine when I reinstalled/reconnected.

It's not accepting the code that I confirmed at the dealer.

I've performed the "wait-an-hour-then-3-more-attempts" as well as disconnecting/reconnecting battery.

Suggestions?

[jeffnhiscars]

Was the code from the dealer based on the VIN that the radio was originally installed in ?

[bimmer4me]

It was based on the Serial # on the radio. I watched as he went into the Alpine website via their dealer Extranet portal: Aftersale service->Aftersales service main->Alpine Radio Codes. It only asked him for the model number (in this case CM5907) and the serial number (in this case 10 characters A########A).

It returned 15423.

He's also sent a PuMA request in... I guess that's some sort of personalized technical support request often used by the dealer mechanics when working on the "older cars".

[andrewboi]

Any updates or luck? I have a similar problem

[mr2peak]

Leave the car with the key in the 2nd position for 1/2 an hour before entering the code. Yeah it sucks, but this is how it's done.