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
Turn Signal?
Turn Signal Circuit:
DESCRIPTION:
The turn signal flasher is provided voltage through the turn signal fuse (15) whenever the ignition is "ON." When the turn signal switch closes, providing a path to ground through the left or right turn signal lamps, the flasher alternately opens and closes. The BCM monitors circuit 16 to determine if the turn signal switch is closed and the turn signal lamps are "ON." If the turn signals are left on for more than a quarter mile, the BCM will send the "TURN SIGNAL ON" message to the driver information center.
TEST CONDITIONS:
Turn signal "ON."
FAILURE CONDITIONS:
Turn signal has been "ON" for over 1/4 of a mile.
ACTION TAKEN:
Display "TURN SIGNAL ON" message.
DIAGNOSIS:
Erroneous message - Short to voltage on circuit 16 or shorted turn signal flasher.
No message - Open in circuit 16 or open in turn signal flasher.
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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