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uwe_schaefer3

Alphard Rear Seat Massage Failure

My 2018 Toyota Alphard hybrid's rear seat massage function isn't working. The switch doesn't turn it on, and there's an error stored when scanned. I've checked the fuses, but found nothing. Any ideas?

Summary of the thread

The rear seat massage function in a 2018 Toyota Alphard hybrid was not working, with the switch failing to activate it and an error stored in the system. Initial checks of the fuses revealed no issues, suggesting a possible electrical problem. The suggested solutions included checking the wiring harness and connectors under the seat for loose or corroded connections. Ultimately, a workshop visit confirmed a defective cable or plug connection as the cause, which was repaired.

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4 comment(s)

matteoschwarz1

Massage seats in these can be complex. When you say 'error memory', is that a diagnostic trouble code (DTC) from an OBD-II scanner? If so, what's the code? Also, have you checked the wiring harness and connectors under the seat? A loose or corroded connection could cause this. Check the switch connector, repeated use can loosen it.

uwe_schaefer3 (community.author)

Thanks. Yes, DTC from OBD-II, but I didn't note the specific code. For the wiring harness and connectors, is there a specific area I should focus on? Any common wiring failure points for the massage seat function in the Alphard?

matteoschwarz1

Without the DTC, it's hard to say, but a code plus a non-functioning switch points to electrical. You checked fuses, so next would be a defective cable or plug. I'd still suggest a workshop visit; they can measure current flow and find the problem easily. It might save you time.

uwe_schaefer3 (community.author)

Appreciate the advice. Took it to a workshop, and it was a defective cable or plug connection, like you thought. Repair was 95€, which seems reasonable. Thanks again.

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TOYOTA

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ALPHARD