HAVE A 2008 PRIUS IN THE SHOP WONT POWER UP NEW 12 VOLT BATTERY AND NEW DASH UNIT ONLY THING THAT WORKS IS HEADLIGHTS AND POWER DOOR LOCKS NO LIGHT ON POWER SWITCH
Then there are codes or something stored somewhere in the system to the OBD2 port somebody needs to try and get the codes or the battery that's new may not be as new as you think You may want to check that The lights come on how long do they stay on before they start to go dim at least 5 minutes or something close to that not two
By "New Dash Unit" do you mean you installed a new car stereo and that's when these problems began? Or something different than that?
Yeah, that's called "combination meter." Your symptoms are similar to what happens when the capacitor in that part goes bad, but slightly different. If the combination meter goes bad with that underpowered capacitor it will seem as there's no power or dash lights but headlights will work and power door lock will work. The only difference is despite the dash being out, the car will still drive and powering the car off will be problematic. Can you confirm that car still drives and it's hard to power off? If you can than that's your problem.
Check fuses. DOME, EFI, and AM2 for starters. Any history of jumpstarts prior to the new 12 V battery?
THE COMBINATION METER IS NEW CAN NOT DRIVE CAR WILL NOT POWER UP AT ALL NO LIGHT ON POWER BUTTON DOOR LOCKS AND DOME LIGHT IS ALL THAT WORKS IVE CHECKED ALL THOSE FUSES ALL TEST GOOD CANT EVEN GET POWER TO SCAN THE VEHICLE
In that case I'd read up on parts that need to be replaced when someone tried to jumpstart the car at the jump points with reverse polarity.
CAR WAS NOT REVERSE JUMP STARTED JUST WOULDNT START WHEN HE WENT OUT TO START IM NOT SEEING ANYTHING BLOWN ON FUSES CHECKED ALL OF THEM
Define New? A new CM from Toyota or a reworked CM that was new to you? If you got a reworked one, from where? ... that you know of. Does that include a visual inspection of the 100 A fusible link assembly in the engine room fuse box, all fuses in the under-dash fuse block, and the 5 A fuse in the battery block assembly on the 12 V positive terminal? Did you check the fuses for continuity with an ohmmeter? Sometimes they look intact but are blown. Do you have 12 V at the jumpstart terminal in the engine-room fuse box? Do you have 12 V at each of the fuses? Did you test all the relays? If all of that is good, you need to start tracing the 12 V supply from the battery until you find the break in supply.
cm is new from dealer its not the cluster those act diffferntly than these ive been working on a prius cab fleet for 14 years never had one do what this one is doing