Sienna Electrical System Failure

Experiencing bizarre electrical issues with my 2004 Toyota Sienna, gasoline engine, at 95586 km. Sporadic errors in driving mode, error lamps light up randomly. Audio/navigation systems are failing, sometimes the whole system shuts down. Scanned it, error stored in memory, but I can't make heads or tails of it. Has anyone dealt with something similar?

4 comment(s)

Sounds familiar. I had similar problems with my old BMW 3-Series. Random system failures, weird error messages... was a nightmare. Did the error code give you any hints about which system is failing?

The error code isn't specific, just a general system failure. Any idea what the root cause was in your BMW? I am thinking maybe a bad control module, or a ground issue.

Turned out to be a defective cable connection to the BUS system. The workshop identified it quickly. If your scan tool isn't giving you specifics, and it affects multiple systems, I would suggest going to a trusted workshop.

Thanks for the insight! I had a feeling it was a wiring issue. Took it to my mechanic, and you were spot on - defective cable connection to the BUS system. Repair cost was 155€. Appreciate the help!

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