Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSDELCO-LOC II RADIO - SETTING PROCEDURE UPDATETO DISPLAY RADIO DISPLAY CODE
1990 Chevrolet Lumina APV V6-191 3.1L
To Display Radio Display Code
1990 Chevrolet Lumina APV V6-191 3.1LSECTION To Display Radio Display Code
D. To display Radio Display Code (Scrambled Backup Code)
IMPORTANT: In order to display this code, the radio should be in "LOC" mode or have "SEC" displayed before proceeding.
1. Press and hold presets 2 and 3 for about 8
seconds until the first 3 digits of the display code
are displayed. "123"
2. Please write the number down. "123"
3. Press the am-fm button. The second 3 digits of
the display code are displayed. "456"
4. Please write the numbers down. "456"
This display code can be unscrambled to get the factory backup code to unlock the radio by calling the Delco Phone number and entering the display code along with your authorization code.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.