’s sliding door may have suddenly stopped working.
The first possibility is a latch motor failure. This is fairly common in Siennas, but—fortunately—quite easy and cheap to resolve. You’ll know this is the issue if you hear the motor make a noise while it attempts to open the door (before it fails to do so).
Frayed cables are another common cause of sliding door issues. If the cable begins to fray, you may notice your door’s abilities go in and out. Once the cable snaps, the door won’t work at all.
A third possibility is a circuit overload. This happens when the power sliding door isn’t able to latch on properly (due to something blocking it). The electric motor’s circuit will become overloaded and this will trip the fuse and prevent the door from being closed entirely. This problem is easy to diagnose because you can simply check the upper and lower tracks of the door and see if anything is blocking it.
If none of these problems are evident, then it’s time to take your Sienna to the
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