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.
1989 Oldsmobile Toronado V6-3800 3.8LFACTORY OEM SERVICE PROCEDURE
Output
BCM OUTPUT DISPLAYS:
When troubleshooting a malfunction, the BCM output cycling can be used to determine if the output tests can be actuated regardless of the inputs and normal program instructions. Once a test in outputs has been selected, the test will display "HI" and "LO" for three seconds in each state to indicate the command. Actual circuit operation will depend on circuit integrity. If the test selected is not allowed under the current conditions a " =- =- " display will result.
A brief summary of each output is provided below:
BO00 The "CYCLE NONE" display will not display "HI" or "LO" as this is a resting spot where no outputs will be cycled.
BO01 The "C/C VENT" display is "HI" when the vent solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO02 The "C/C VAC" display is "HI" when the cruise control vacuum solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO04 The "COUR LMPS" display is "LO" when the courtesy lamp relay is "ON" (energized).
BO05 The "TWILIGHT" display is "LO" when the twilight relays are on (energized).
BO10 The "CHIME 1" display is "LO" when the intermediate chime is "ON" (sounding).
BO11 The "CHIME 2" display is "LO" when the slow chime is "ON" (sounding).
When troubleshooting a malfunction, the BCM output cycling can be used to determine if the output tests can be actuated regardless of the inputs and normal program instructions. Once a test in outputs has been selected, the test will display "HI" and "LO" for three seconds in each state to indicate the command. Actual circuit operation will depend on circuit integrity. If the test selected is not allowed under the current conditions a " =- =- " display will result.
A brief summary of each output is provided below:
BO00 The "CYCLE NONE" display will not display "HI" or "LO" as this is a resting spot where no outputs will be cycled.
BO01 The "C/C VENT" display is "HI" when the vent solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO02 The "C/C VAC" display is "HI" when the cruise control vacuum solenoid is "ON" (energized). The cruise switch must be "ON" for this output to cycle.
BO04 The "COUR LMPS" display is "LO" when the courtesy lamp relay is "ON" (energized).
BO05 The "TWILIGHT" display is "LO" when the twilight relays are on (energized).
BO10 The "CHIME 1" display is "LO" when the intermediate chime is "ON" (sounding).
BO11 The "CHIME 2" display is "LO" when the slow chime is "ON" (sounding).
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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