Overdrive off light

2003_ARDNUT

MEMBER
2003 TOYOTA TUNDRA
4.7L
V8
4WD
AUTOMATIC
206,000 MILES

When putting my truck in reverse the OD off light comes on. I’ve ensured I am not pressing the button as I shift. I put it in drive a press the button and all is fine. The button works as it should otherwise.

Tuesday, February 18th, 2020 AT 11:51 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

Hi,

It sounds like an issue in the switch wiring. I have a diagnostic chart. It is somewhat involved for testing specific leads. However, I have a feeling it is related to the wiring. Something must be shorting to power when the switch is in the reverse position.

If you look at the attached pics, it shows the schematic and the procedure. Again, it's a little involved. However, here are a few links you may find helpful:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

_____________________

Let me know if this helps.

Take care,
Joe

Images (Click to make bigger)