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
Body Control Module
- Description & Operation
- Trouble Shooting
- BCM DTC Definition
- Diagnosis & Repair
- Notes
- BCM System Check
- U1128, Loss Of Serial Communications - IRC
- U1176, Loss Of Serial Communications - RKE
- U1255, Generic Loss Of Class 2 Devices
- U1300, Class 2 Short To Ground
- U1301, Class 2 Short To Battery
- DTC B1552, Loss Of BCM Keep Alive Memory (KAM)
- DTC B1556, BCM EEPROM Write Error
- DTC B1558, BCM EEPROM Checksum Error
- DTC B1970, Exterior Light Power Fault
- DTC B1971, Inadvertent Power Fault
- DTC B1972, Low Power Driver Fault
- DTC B1973, High Power Control Fault
- DTC B1982, Battery Voltage Too High
- DTC B1983, Battery Voltage Too Low
- DTC B2470, Daytime Running Lights Fault
- DTC B2471, Interior Lights Fault
- DTC B2472, Low Beam Output Fault
- DTC B2473, High Beam Fault
- DTC B2476, Parking Lights Output 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.