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.
1997 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
Unable To Communicate With Radio Receiver
- Check for DTC U1128. See BCM DTC DEFINITION . If DTC U1128 exists, see appropriate test under DIAGNOSIS & REPAIR . If DTC U1128 does not exist, go to next step.
- Check radio function. If radio is functioning properly, go to next step. If radio is not functioning properly, repair as necessary.
- Check for a poor connection at radio receiver 32-pin connector terminal F6 (Brown/White wire). Repair as necessary. If connection is okay, replace radio receiver.
Factory Service Tools
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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.