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 DeVille BaseFACTORY OEM SERVICE PROCEDURE
Body Control Module
- Description & Operation
- Self-Diagnostic System
- Diagnostic Parameters
- Diagnosis & Repair
- Notes
- Class 2 Serial Data Line System Check
- Chart A, Scan Tool Will Not Communicate
- DTC U1016, Loss Of Serial Communications - Pcm
- DTC U1088, Loss Of Serial Communications - Sir
- DTC U1096, Loss Of Serial Communications - IPC
- DTC U1153, Loss Of Serial Communications - CCP
- DTC U1169, Loss Of Serial Communications - Mmm
- DTC U1255, Class 2 Initialization Error
- DTC U1300, Class 2 Short To Ground
- DTC U1301, Class 2 Short To Voltage
- DTC B0532, Fuel Level Sender Short To Ground
- DTC B0533, Fuel Level Sender Short To Voltage
- DTC B1552, Loss Of PZM Keep Alive Memory (KAM)
- DTC B1556, PZM EEPROM Write Error
- DTC B1558, PZM EEPROM Checksum Error
- DTC B1970, Exterior Light Power Fault
- DTC B1971, Inadvertent Power Fault
- DTC B1972, Low Power Control Fault
- DTC B1973, High Power Control Fault
- DTC B1981, Battery Voltage Too Low
- DTC B1982, Battery Voltage Too High
- DTC B1983, Source Voltage Too Low
- DTC B2470, Daytime Running Lights Fault
- DTC B2471, Interior Lights Fault
- DTC B2472, Low Beam Output Fault
- DTC B2473, High Beam Output Fault
- DTC B2476, Parking Lights Output Fault
- DTC B2477, Reverse Relay Shorted To Ground
- DTC B2478, Reverse Relay Shorted To Voltage
- DTC B2502, Park Relay (BTSI) Shorted To Ground
- DTC B2503, Park Relay (BTSI) Shorted To Voltage
- DTC B2550, Storage Mode Entered
- DTC B2719, UTD - Trunk Tamper Switch Fault
- Removal & Installation
- Wiring Diagram
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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