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.
Overdrive Off Indicator
With the ignition switch in the RUN position, voltage is applied through the Gage Fuse (10-amp) to the OD/OFF indicator light. Whenever the overdrive switch (located on the shifter) is released to the OFF position, system voltage is applied through the closed contacts of the overdrive switch to ground. When this occurs, the OD/OFF indicator light in the instrument cluster will illuminate and the Powertrain Control Module (PCM) will simultaneously receive a low voltage signal at the O/D ON/OFF input. With a low voltage input, the PCM will disable the overdrive function. Whenever the overdrive switch is depressed to the RUN position, the overdrive switch opens. When this occurs, the O/D/OFF indicator light in the instrument cluster will go out and the PCM will simultaneously receive a high voltage signal at the O/D ON/OFF input. With a high voltage input, the PCM will enable the overdrive function and the transaxle is permitted to shift into overdrive when appropriate.
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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.