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There are several potential reasons why the auxiliary input may not be functioning in a 2011 Chevy Equinox. Before considering replacing the input jack, it is advisable to first check the fuses located in the fuse box inside the passenger compartment to ensure none of them are blown. Consult the fuse box diagram to identify the relevant fuse, remove it from its slot, and inspect it under light to confirm that the filament is intact. If the fuse is faulty, replace it with one of the same amperage rating. If the fuse appears to be in good condition, it is possible that the electrical connector connected to the auxiliary port is either damaged or disconnected. To investigate this, you may need to remove the plastic panels to access the back of the port for verification.
If the auxiliary port in the 2011 Chevrolet Equinox is malfunctioning, it could be due to insufficient power or a build-up of dirt within the port.