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Ironmike
Ironmike, ASE Master Tech, L1
Category: Car
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Experience:  30 years GM certified, Ford certified
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I have a 1995 Geo Prizm with a locking radio. Having to change

Resolved Question:

I have a 1995 Geo Prizm with a locking radio. Having to change the battery, the radio is now locked. Is there any way, without going to the Chevrolet dealership, that I can get the instructions on how to unlock the radio?
Submitted: 7 years ago.
Category: Car
Expert:  Ironmike replied 7 years ago.

Greetings,

Here is a procedure if you lose power or remove the radio while the secuirty is activated.

If the security function is activated and the radio is disconnected from battery power, the radio will display "LOC." The radio will not operate until the correct code is entered. If the customer code is lost or unavailable, use the following procedures to determine the factory backup code. This procedure requires a tone dialing telephone.

  1. Turn the ignition switch to "ACC" or "ON" position.
  2. Press and hold the "2" and "3" buttons until a four-digit number appears on the display. This is the radio display code; record this number.
  3. Using a tone dialing telephone, call 1-800-537-5140 (USA and Canada).
  4. When the computer advises, enter the appropriate dealer code using the telephone keypad:
    • Chevrolet/Geo Dealer Parts Code: Enter a "1" and the last five digits of your Chevrolet/Geo dealer parts code, then press "*" (star key).

NOTICE: If the dealership handles multiple car lines and has been assigned a non-Chevrolet parts code, refer to the following:

  • Pontiac Dealer Parts Code: Enter a "2" and the last five digits of your Pontiac dealer parts code, then press "*" (star key).
  • Oldsmobile Dealer Part Code: Enter a "3" and the last five digits of your Oldsmobile dealer parts code, then press "*" (star key).
  • Buick Dealer Parts Code: Enter a "4" and the last five digits of your Buick dealer parts code, then press "*" (star key).
  • GM Truck & Bus Dealers Parts Code: Enter a "5" and the last five digits of your GM Truck & Bus dealers parts code, then press "*" (star key).
  • Cadillac Dealer Parts Code: Enter a "6" and the last five digits of your Cadillac dealer parts code, then press "*" (star key).
  1. When advised, enter the four-digit radio display code obtained in Step 2, then press "*" (star key). The computer will respond with the factory backup code; record this number.
  2. To unlock the secured radio, refer to "Unlocking System After Power Loss" earlier in this section.

good luck

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