2008 Prius Dead No Radio, MFD but headlights work

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by ChrisMN, Sep 10, 2021.

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  1. ChrisMN

    ChrisMN New Member

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    My 2008 Prius won't start. No radio, MFD or Start button light. Interior lights, headlights, brake lights all work. Tried both FOBs in slot. 12v battery less than 3 months old. Replaced the AM2 fuse with the spare.

    No luck. Any ideas?
     
  2. Fred_H

    Fred_H Misoversimplifier

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    Perhaps the start button has a bad connection or is broken. But first check the 12V battery voltage.
     
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    First question is 'was the original AM2 fuse open?'
    If the original AM2 fuse was open, did you correct the problem that caused it to open, prior to installing the spare?
    If the fault was still present, then the new AM2 fuse is very likely open now, also.

    The AM2 typically burns open due to the inverter cooling water pump failing. You can unplug this pump from the circuit at two places. One is at the pump itself. The second location is easier to access and it the one wire connector just above and to the passenger side of the underhood fuse box. If you suspect the ICWP to have failed, disconnect that plug first, before replacing the fuse.
     
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  4. ChapmanF

    ChapmanF Senior Member

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    ... and if I were facing such an issue and it turned out not to be the AM2 fuse, the next thing I would probably do would be to fetch the wiring diagram (more info) and my multimeter, and just start working down the likely paths in the diagram checking where power is and isn't. There are a few basic routines in diagnostics that kind of have to be done up close, though faraway people on the internet can sometimes help with questions that come up from what you find.
     
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