Previa Terminal 30 Interrupted Fault

Whoa, sounds familiar! I’ve got a Previa too – and I had a similar freakin' problem last year! 'Terminal 30'… yeah, that refers to the constant live feed from your battery. When that's interrupted, things get funky. Is your Previa cranking slowly, or is it more of a click-click-nothing situation? Have you checked all your mega fuses? Those big boys can sometimes be the issue!

Thanks! The engine cranks slowly. I haven't checked the mega fuses. Where are they located and what are their typical failure modes? Could a faulty ignition switch cause this intermittent interruption of the Terminal 30 circuit?

Okay, 'cranks slowly' definitely points to a power issue. Those mega fuses are usually near the battery or in the main fuse box under the hood – they're there to protect major circuits. Check for any corrosion or cracks. As for the ignition switch... it's possible, but less likely if the engine cranks at all. Honestly, with electrical gremlins like this, it's really hard to be sure without proper diagnostics with multimeter or oscilloscope and some electrical know-how. I suggest you take it to a workshop.

I appreciate the explanation about the mega fuses and the ignition switch. I'll inspect the mega fuses. Given the complexity, I've decided to take it to a mechanic. They found a defective battery, heavily discharged due to parasitic drain. Replacement resolved it, costing 290€.