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

[CTScott]

Originally Posted by CTScott

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.

OK. I've been driving around today with the TPWS disconnected as above, and no TPWS light. We are going out to dinner tonight, and where we are going is about 35 minutes away, so that will be a good test. If the light remains off and I still don't have any DTCs logged, when I get home tonight I'll post the updated method.