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 UPDATEOBTAINING FACTORY BACKUP CODE
1990 Chevrolet Lumina APV V6-191 3.1L
Obtaining Factory Backup Code
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Obtaining Factory Backup Code
E. To obtain Factory Backup Code After Obtaining Display Code (Step D)
1. After obtaining the display code in Step "D" call 1-800-537-5140 (U. S. and Canada) or (317) 451-8965. (You will need your six digit dealer code number).
2. When the computer prompts, using a Touchtone (TM) telephone, enter your 6 digit dealer code, then press *. For example, if your dealer code is 213063, then you would enter 213063 *.
3. When prompted, enter the 6 digit radio display code, then press *. The computer will respond with the factory backup code. Please write it down. The computer may give you two possible codes. If the first code does not unlock the radio per step "A", then use the second code. On some models another possible backup code is 0's. Refer to step "A" to use these factory backup codes.
RENDER: 1.0x
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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.