DIY - Bypassing Tire Pressure Warning System (TPWS / TPMS)

[CTScott]

Originally Posted by CTScott

OK. Linny just PM'd me. His had been working fine until he headed out of town for Thanksgiving. All of his trips prior had been short (<6 miles). About 15 minutes into his trip the light came on.

So, it looks like this solution does not work - It looks like the third component is time.

Looked into it a bit more. The TPMS starts a timer once it receives power. After ~15 minutes of power and no comm from the sensors it turns the light on.

I am now experimenting with just using the brown wire, which is the output to the combination meter. To turn the light off, the TPWS module supplies ~4.0V to the brown wire. At 2.4V or less the light will come on.

I disconnected the TPWS and applied ~4.0 V to the brown wire (via a resistor voltage divider from the 12V supply on the connector). The light does not light. I will drive around for a week or so to make sure that eliminating the module doesn't cause a DTC to be thrown.