Update - just about 250 miles on TCM swap with no issues. I did send the original out for rebuild.
On to the next - "Brake Lamp" light comes on and stays on when placing foot on brake pedal. Third Brake light (upper light on rear window) out, bulb good. Everything else works on rear hatch - wiper, rear defrost, squirted.
Issue is that third light - I believe the Brake Lamp warning is doing its' job.
What do you think?

 

I moved your post to a new thread. Rule is new problem, new thread.

Check whether bulb socket is getting power. May be faulty socket or bulb.

good luck

 

Oops...will do.
No power to third brake light - is there a separate fuse for this light?

 

Same fuse (NO 47, underhood fuse box) provides power to all brake lights. Wiring will need to be traced to find wiring fault.

"Brake Lamp" Warning only applies to brake lights in rear tail light assys.

good luck

 

I think on the 4th gens the power for the high mount/third brake light comes from the connection on the left/drivers side rear tail light - not at home so my manuals and diagrams are not with me right now

 

The fuse for all the brake lights is under-hood Fuse No. 25 (20A). It won't be the fuse if other brake lights work and the horns work.

The high-mount brake light power has to run through the left brake light failure sensor. If there is no power (+) to the Grn/Yel wire that goes to the high-mount brake light, then it may be an issue with the left brake light failure sensor (or a wiring issue).

Any brake light bulb failure should trigger the safety indicator. This is how the safety indicator works:

Safety Indicator
With the brakes off, ground is provided for the safety
indicator through either of the failure sensor coils
and any of the brake light bulbs. When you push the
brake pedal, battery voltage is applied to all the failure
sensor coils, closing the relay contacts, which
keeps the safety indicator circuit WHT/GRN wire
grounded. If a brake light bulb fails, at least one of
the failure sensor coils will not be energized. The
safety indicator circuit WHT/GRN wire will then no
longer be grounded by either the diode or the relay
contact, and the safety indicator circuit will turn on
the brake lamp indicator.

 

Great info - thanks!
I did inspect the wiring in rear hatch, all in fantastic shape. I will look at a possible sensor issue once the temp get out of the 20's!
Happy New Years to all !

 

Thanks RB.....corrected my post. Was going from memory on the 4th gen's and I was WRONG.