Well six weeks or so has gone by and still this problem niggles me, I hate to be bested by some problem that probably has a simple answer. Mind you the problem maybe that I am missing the obvious cause. It is the only thing that does not work on the car besides the tire pressure sensors.
After all the time spent on help by pizzaguy and Shamrock, my thanks to them, I think that I owe it to them to solve the riddle.
Maybe I will have to look at the CLP/SSM which I dread as there is a lot of work involved in doing so. Taking out the radio and removing the radio/AC bezel is a big enough job.
Watch this space as all the steps will be put here with the voltages on the various circuits.
Update
I tested the voltages on two circuits.
There was no change in the Voltage in the circuits with the ignition ON or OFF.
Initially the 1.5 Volts was 5 Volts but went to 1.5 Volts after a few seconds.
I could not find the ground to the resistor so the switch was not tested although when the radio was out of the dash I measured the resistance and got 200 Ohms.
I feel no closer to finding the problem.



UPDATE #2
The rear face of the emergency flasher module.
The Ohm reading is taken between Pins #4 and #8.
When the button is pressed to the OPEN position the meter reads 200 Ohms.
When the button is pressed to the CLOSE position the meter reads 0 Ohms.
Now I have to find the ground for Pin #4 or take out the radio face plate.