Won't Boot - Replaced 12v battery did not fix

Slow death, at first car would move with warning lights on. Then wouldn't go at all. Lights still worked. I tried jumper cables from another car attached (correctly) directly to the 12v battery. No change. I replaced 12v battery anyway. Battery place said it was bad. With new battery same result at first. Dome light works, mfd would light up saying problem. All warning lights on. Won't shift into drive or reverse. Would shift into neutral. Then when I was giving up for the day, I pressed power button with foot on brake and only got quick flash of amber check (or something, I'm not sure) light. Then nothing. No MFD, no dash or warning lights. Windows won't roll up. Dome light still works and voltage from new 12v battery shows 12.9 under front hood at jump post. What should I check next.

 

She's got a few miles on her. 244k. I bought it as a cheap car for the kids to drive. It has a few dents. Anyway, when I press the brake pedal, I can hear the brake pump thing hum, I haven't checked to see if the lights come on yet. But if I pressed the power button without my foot on the brake, (before everything stopped) it would boot into acc mode (all warning lights still on). So I assume brake switch is functional. I cannot get any DTC codes. My reader says 0 codes set. The catalytic converter codes would always set before these problems happened and I haven't fixed that yet, so I should get those codes but instead I get 0 codes. After I installed a new 12v battery in the back and tried many times to power on, I went into the house to read the manual. When I came back, 20 min later, the MFD would no longer light with "problem" and the dash and warning lights would not come on. When I press the power button with my foot firmly on the brake I just get a quick flash of a warning light and then nothing. Rear hatch will no longer open and windows will not go up. But the dome light still works. Any Ideas?

Forgot to mention the fuses. I looked at the 120 amp at the battery and many of the other fuses under the steering wheel and under the hood. I didn't check fuses for things like wipers and heaters. I did not "see" any problems but I did not test with a meter. It is a pain crawling under the wheel. My vision is bad and I get dizzy. Anyway if you know of a particular fuse I should check or if anyone has a magic easy way to check fuses, I could use the knowledge.

 

I sanded the connector, but I should do a more diligent job with the bolt and other terminals. I'll try that and post the results. Possibly tonight. Thanks.

 

Reply to jc91006. I purchased the car used so I don't know if any recalls have been performed. Which recall are you referring to? Will check fuses later today.

 

Thanks, will check on the recall stuff. I rented a car dolly and towed the car home yesterday. It was difficult getting the car on and off the dolly with it in park. I wish there was a way to roll the windows up. Give me a few days to play with it and I'll post the results. Dan

 

I got a code B2271 so I bought a new Power Source control module from ebay. When I took the old one out the part number was different from the one I bought. Does anyone know if a 89670-47010 will work in my 2005 prius. My original part number is 89618-47011. The part I bought was suppose to work in a 05-09 prius. Think I'll try and see what happens.

 

The new psc didn't fix the problem. I am re ordering the correct part and see if this works.

 

Still doesn't work.
I installed a replacement eBay Power Source Control Module (89618-47011 the correct part this time). Nothing changed. The MFD is completely dead. The Combination Meter is dead. When I hook up the 12v battery, the alarm beeps until I shut the door. I press on the brake firmly and press the power button. All I get is a quick flash of a amber engine light then nothing. All screens blank. The only codes I can get with my mini-vci is B2271 Ignition Hold Monitor which is the code that led me to change the PSC. Does anyone have any ideas about what I should check next. It seems like there might be a bad relay somewhere but that is just a guess.
To date I have done the following:
Replace 12v battery with fully charged new yellow optium prius battery
Cleaned connections at battery
Checked all fuses in front engine and driver areas
Check fuses at Battery
Replaced PSC

There is a spark when I hook up the 12 volt battery ground but I believe this is normal.
Thanks, Dan

 

Do you these might be the symptoms of a bad relay? Perhaps IG1 or IG2

 

I am reading the codes with an old win xp laptop running techstream 10? with a generic mini vci cable.
The only system that responds is the power source control. All other systems say unavailable.