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.
2000 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
Body Control Modules
- Description & Operation
- Component Locations
- Programming
- Trouble Shooting
- Self-Diagnostic System
- Notes
- Body Control Module (BCM) Diagnostic System Check
- Automatic Level Control (ALC) Diagnostic System Check
- Lighting System Diagnostic System Check
- ONSTAR(R) Diagnostic System Check
- Radio/Audio System Diagnostic System Check
- Remote Keyless Entry Diagnostic System Check
- Clearing DTCS
- Scan Tool Does Not Communicate With Class 2 Serial Data Link
- Scan Tool Does Not Communicate With ALC Sensor
- Scan Tool Does Not Communicate With Keyword 82/Keyword 2000 Data Line
- Scan Tool Does Not Power Up
- Diagnostic Tests
- DTC B1552: Loss Of BCM Keep Alive Memory (KAM)
- DTC B1556: BCM EEPROM Write Error
- DTC B1558: BCM EEPROM Checksum Error
- DTC B1656: Radio EEPROM Write Error
- DTC B1658: Radio EEPROM Checksum Error
- DTC B1760: Cd Changer Not Responding
- DTC B1780: Theft Lock Enabled
- DTC B1970: Exterior Light Power Fault
- DTC B1971: Inadvertent Power Fault
- DTC B1973: High Power Control Fault
- DTC B1982: Battery Voltage Too High - BCM
- DTC B1982: Battery Voltage Too High - Radio
- DTC B1983: Battery Voltage Too Low - BCM
- DTC B1983: Battery Voltage Too Low - Radio
- DTC B2462: GPS Signal Error
- DTC B2470: Daytime Running Lights Fault
- DTC B2471: Interior Lights Fault
- DTC B2472: Low Beam Fault
- DTC B2473: High Beam Fault
- DTC B2476: Parking Lights Fault - BCM
- DTC B2476: Cellular Phone Select Service Switch Malfunction - Radio
- DTC B2556: EEPROM Error
- DTC B2560: RKE Message Validation Error
- DTC U1000 & DTC U1255: Class 2 Communication Malfunction
- DTC U1001-U1254: Loss Of XXX Communications
- DTC U1300: Class 2 Short To Ground
- DTC U1301: Class 2 Short To Battery
- DTC U2100: Can-Bus Communication Malfunction
- DTC U2103: Fewer Controllers On Bus Than Programmed
- DTC U2104: Can Bus Reset Counter Overrun
- DTC U2105: Lost Communication With Engine Control Module (ECM)
- DTC U2106: Lost Communication With Transmission Control Module (TCM)
- DTC U2108: Lost Communication With Abs Control System (EBTCM)
- Symptom Tests
- Removal & Installation
- Wiring Diagrams
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.
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