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.
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HOMESERVICE MANUALSCADILLAC1985FLEETWOOD BASE, 4D LIMOUSINEREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDFI BCM TESTS W/CODES - FWDBCM DATA DISPLAY
1985 Cadillac Fleetwood Base, 4D Limousine
BCM Data Display
1985 Cadillac Fleetwood Base, 4D LimousineSECTION BCM Data Display
- Code ".7.0" must be displayed on FDC panel before diagnostics can begin display of BCM data series. To display BCM data, depress and release "Outside Temp" button on CCP. BCM data series begins as display switches from code ".7.0 " to code "F.8.0".
- To advance display, depress "HI" button on CCP. To return to a lower numbered parameter or jump directly from "F.8.0" to the end of the parameter list ("P.3.1"), depress "LO" button on CCP.
- When BCM data display is first initiated, parameter numbers "P.2.0-P.3.1" will be displayed for 1 second on FDC, followed by numerical value. The parameter value will be displayed for 9 seconds. Each parameter and value will be repeated until manually advanced to next parameter.
- When trouble shooting a malfunction, BCM data display can be used to compare vehicle with a vehicle that is functioning properly. A summary of parameters with ranges and display units is contained in the BCM DATA PARAMETERS table.
BCM DATA PARAMETERS (FWD DEVILLE & FLEETWOOD)
| Display | Parameter | Range |
|---|---|---|
| P.2.0 | Blower Volts | -3.3-18.0 v |
| P.2.1 | Coolant Temp. | -40-215°C |
| P.2.2 | Command. Door Angle | 0-100% |
| P.2.3 | Actual Door Angle | 0-100% |
| P.2.4 | Air Del. Mode | 0 (Max. A/C) |
| ***** | Air Del. Mode | 1 (A/C) |
| ***** | Air Del. Mode | 2 (Inter.) |
| ***** | Air Del. Mode | 3 (Heater) |
| ***** | Air Del. Mode | 4 (Off) |
| ***** | Air Del. Mode | 5 (Nor. Purge) |
| ***** | Air Del. Mode | 6 (Cold Purge) |
| ***** | Air Del. Mode | 7 (Defrost) |
| P.2.5 | In-Car Temp. | -40-102°C |
| P.2.6 | Outside Temp. | -40-102°C |
| P.2.7 | Condenser Out. | -40-215°C |
| P.2.8 | Evap. Input | -40-93°C |
| P.2.9 | Fuel Level | 0-19.0 gal. |
| P.3.0 | Ignition Cycles | 0-99 |
| P.3.1 | BCM PROM I.D. | 0-255 |
RENDER: 1.0x
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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.