Call your local dealer they will have you push and hold two sets of memory buttons that will show a code then give then that code and they will give you a code to unlock the radio.
SOURCE: Pontiac Montana '99 Water Thermostat removal
Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.
SOURCE: I bought a used radio for my pontiac montana 2001
There is a security code for it, you may have to get it from the dealer or look it up online if its a factory stereo.
SOURCE: 2002 Pontiac Montana radio unlock code
Hi you can try looking on ebay, i have used this method a few times its simple and cheap, or the dealer can get it for you, you just need the seriel number, Hope this helps
SOURCE: Radio/cd player not working in 1999 pontiac montana
did you pull the radio out? it might just be a loose wire or something simple.. the car is 10 years old stuff becomes loose
SOURCE: 1999 pontiac montana doors will not unlock with
your door lock actuators are bad.there electronic and are right costly
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