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.
1993 Cadillac AllanteFACTORY OEM SERVICE PROCEDURE
Body Computer Module
- Description & Operation
- Component Locations
- Trouble Shooting
- Self-Diagnostic System
- Trouble Codes
- Visual Inspection
- Basic Knowledge Required
- Computer System Service Precautions
- Customer Snapshot
- Self-Diagnostic System Check
- Entering Diagnostics
- Data Displays
- Notes
- BD20 Commanded Blower Voltage
- BD21 Coolant Temperature
- BD22 Commanded Air Mix Door Position
- BD23 Actual Air Mix Door Position
- BD24 Air Delivery Mode
- BD25 In-Car Temperature
- BD26 Actual Outside Air Temperature
- BD27 High Side Temperature
- BD28 Low Side Temperature
- BD32 Sun Load Temperature
- BD40 Actual Fuel Level
- BD42 Dimming Pot
- BD43 Twilight Delay Pot
- BD44 Twilight Photocell
- BD50 Battery Voltage
- BD51 Generator Field
- BD60 Car Speed
- BD61 Engine RPM
- BD71 Oil Pressure
- BD98 Ignition Cycle
- BD99 BCM Prom Id
- Input Displays
- Output Displays
- Override Displays
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- DTC B119: Twilight Photocell Circuit
- DTC B120: Twilight Delay Switch Pot Circuit
- DTC B120-B122: Twilight Delay - Panel Dimming Switch
- DTCs B332, B333, B334, B335, B336, B337 &/OR B339: MULTIPLE INTERMITTENT CODES
- DTC B332: Loss Of Abs/TCS Data
- DTC B333: Loss Of DERM Data
- DTC B334: Loss Of Pcm Data
- DTC B335: Loss Of Combo Panel Data
- DTC B336: Loss Of IPC Data
- DTC B337: Loss Of HVAC Programmer Data
- DTC B552: BCM Keep Alive Memory Error
- DTC B556: Odometer EEPROM Error
- DTC L110: Headlight Switch Communication Failure
- Code L411: Lighting System Low Voltage Warning
- Removal & Installation
- Connector Identification
- Wiring Diagrams
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.