Overheating, radiator fans aren't running.

WAY back in the beginning you made some bad assumptions ........and passed them on to us, which caused you to get some bad advice.

At this point, I think you should replace your 12 V battery or have it tested.

And then don't ASSume that you know what the problem is without some actual evidence of that.

 

Going back to the OP...

What makes you think the car (AC system, engine, or HSD) is overheating????

If the engine were overheating, you would get a thermometer looking yellow lamp, if the HSD were overheating you would have DTCs for that and your mechanic did not report those. The actuator door code can affect operation of the HVAC system, but would not cause overheating of the AC, engine or HSD.

From another thread, the warning lights and their descriptions:

Brake Light Warning | PriusChat

 

.

 

there should be a diagnostic mode with the car not ready, but a test with a proper machine is the best bet.

 

Turtle on the mfd is the hybrid battery. Ac puts a great load on it,
Time for a hybrid battery.
Before u reply please search it using the search function. Hundreds of discussions on rebuilding and repairing that battery. Spend some time reading and come back informed.

 

i don't. there should be a label on it. it's a small battery, so not likely. the testers they use are usually pass/fail i think.

 

Good plan.

 

Um, these cars do not have a starter and the 12v battery does not start the car, only provides "wake-up power" for it. The HV battery does most everything that takes any real power in these cars; starting, AC, motive power, etc.

 

These cars do not have a traditional brake booster system or master cylinder. There are any number of ill-trained people working on brakes on these cars, failure to follow the OEM Shop manual can not only kill the repairing person, but even if the repairs seems ok, they can do undetected damage to the pump, control valves or other parts of the brake system.

I have had a number of this type of brake systems apart for analysis and they are the most prone part of the vehicle to be incorrectly serviced.

ANY abnormal behavior of the brakes is reason to either have it towed, or at the very least cautiously tendered to the nearest qualified mechanic for evaluation. There are only two "real" safety systems designed into a vehicle: Steering and Braking!

 

1. Check the ABS MTR and ABS MTR 2 relays. The way to check them is to remove each relay, apply 12VDC to the relay coil terminals, and measure resistance across the relay switched terminals. If the resistance is more than 0.5 ohm (after accounting for resistance of the multimeter test leads) then replace the relays.
2. Check the ABS1 and ABS2 fuses by measuring continuity across each fuse, do not rely solely upon visual inspection.
3. If no issues are found with 1 or 2, and assuming no damage to the wiring harness, then the brake actuator assembly may have failed.
4. Regarding the 12V battery, measure voltage across the battery terminals while the car is IG-OFF, after the car has rested overnight. A new AGM battery fully-charged will measure ~13.0V. A discharged battery will measure 12.0V or less. Obviously, the higher reading you get between those points, the better. See what you get. If there is any doubt about the 12V battery, replace it now.
5. Of course the above has nothing to do with the radiator fans running or not.
6. Get the factory repair manual info at techinfo.toyota.com to explore the troubleshooting tree for C1253.

 

NO. These cars start the gas engine with the HV battery.
The draw on the 12 V Aux battery is MUCH less than "normal".

 

No you don't.
When a lead acid battery is near the end of it's life, the resting voltage will slowly drop while it is not in use.
A simple voltage measurement often is all you need.

P.S. You likely are wasting your time chasing trouble codes unless and until you prove beyond a shadow of a doubt that the 12 V is healthy.
A failing 12 V can cause false failure codes to be set.

 

If you have a battery charger, use it now on the 12V battery. The voltage reading isn't terrible but could be higher.