piamoon8
Seat Toledo electrical gremlins
Summary of the thread
A 2009 Seat Toledo with a gasoline engine is experiencing sporadic errors, warning lights, and system failures, particularly affecting the audio/navigation systems. The issue is suspected to be a defective control module cable connection to the BUS system. Communication errors between control modules suggest a wiring harness issue, possibly due to a loose connection, corroded pins, or damaged wire. The problem was resolved by cleaning and re-seating the cable connection to the control module, confirming the initial suspicion.
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4 comment(s)
piamoon8 (community.author)
I scanned it, and it showed a lot of codes, mostly communication errors between control modules. Nothing specific. The randomness is what gets me. Radio cuts out, then the ESP light is on, then it's fine. Does that indicate a wiring issue?
mariewagner32
Communication errors and randomness suggest a wiring harness issue, especially with the audio/nav being affected since they're linked through the CAN bus. That's where the control module comes in. It could be a loose connection, corroded pins, or damaged wire. I'd suggest getting it to a workshop to check the control module and its wiring.
piamoon8 (community.author)
Car is back, and it was a bad cable connection to the control module, like I thought. The connection to the BUS system was faulty. They cleaned and re-seated everything, and it seems good so far. Cost 155€, much better than a new module. Thanks for the advice.
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SEAT
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TOLEDO
mariewagner32
That sounds like a real problem. Have you scanned it with an OBD-II reader to see what error codes show up? It could be a faulty sensor, but the audio/nav issue is strange.