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Radio Battery Constant 12v+ Wire: Blue/Yellow Radio Accessory Switched 12v+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Stereo Antenna Trigger Wire: Black/Red Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
You take out the battery, and the air-filter housing to give extra working space.
Then push in the starter motor to its place, and hand-tighten all its bolts.
Wrench tighten the starter bolts to the engine 38.ft-lb
Connect the solenoid wire, and tighten to 10.ft-lb
Connect the battery positive cable, and tighten to13.ft-lb.
Replace the air-filter housing.
Replace the battery, and terminals.
Crank-up the car.
I also have a '99 Solara. I hate the DRL's also, and had to disable them when I got Xenon headlights. What you have to do is remove the trim around your radio. To do this gently use a flat head screwdriver and pry around the outside. This doesn't take too much effort. Then unscrew the 4 bolts holding the radio in and remove the radio. Now look behind the radio and to the left and you will see a blue wire harness plugged into a module. You need to unclip this harness from the module (was hard for me because of my big hands) but eventually you will get it. Now look at the wire colors and find the red wire with blue markings on it. Thats the one you want to pull out. You cannot just pull this wire out. You need to carefully open the harness with a safety pin, carefully unsnapping it and exposing all of the wire ends. Pull out the red/blue wire and tape it back. Plug harness back into relay and test your work before reassembling everything.
I suspect that the back door ECU (the relay box that you speak of) is bad.
Here is how you check:
With the Key On, you should have 12 VDC in the Solid YELLOW wire going into the box.
Also, You should have power in the solid BLUE wire going into the box.
Operating the switches should transmit power to the BLUE with RED trace, and the VIOLEt with WHITE tracer.
If you have the right power as described abobe, the box is indeed bad. This is a dealer item only, cannot buy one at the local parts store. Sorry. Hope this helps.