Highlander Hybrid Engine Start Failure

I also own a Highlander Hybrid. I had a similar issue where the engine wouldn't crank, and all the warning lights came on. Did you check the battery cable connections? Mine were bad.

Thanks! I visually inspected the battery terminals, and they looked okay. But I didn't test for voltage drop or corrosion underneath. What symptoms did you have? What diagnostic steps did you take before finding the bad connections? Did your engine stall, surge, or have a check engine light before it died?

I had no signs before it just wouldn't start. I also checked the connections, or so I thought. The mechanic found the faulty connections after voltage drop tests. Given your description, I'd suggest a professional check instead of DIY troubleshooting.

Thanks for the help! My initial check was too quick. A technician found bad battery cable connections causing poor electrical contact. The repair was 155€.