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Originally Posted by turbojack
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If I understand this correctly and the low signal is what makes the red LED blink the WI would be injected when the red light blinks. When the red light blinks, the the PCM has diababled HOM, too late for WI at this point. I think that when the DDS3 first sees a signal going from the HOM switch to the PCM it's time to turn on the WI is better.
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Looking at the wiring MOPAR wiring diagram, the +ve end of the red led is wired directly to a steady +12V via a resistor.
In order for the led to light up (HOM is ON), the c14 junction has to go "low". When the led blinks, the c14 junction will go "high, "low", "high", "low" etc.
My logic tell me that when c14 goes low, it is at the "HOM" mode.
The function of the HOM switch is not important as it is momentary so I cannot determine what state it is in after it was pressed until the red confirms it. It can also cancel the HOM mode after a momentary "press".
Am I on the right track?