OE Diff Lock Pump Troubleshoot

the_new_nomad

15 F250 | 99 Montero | 84 Avion | Tiger 900
On a Gen 2.5 Montero with winter package: My rear diff locker no longer makes an audible noise when the switch is pushed like it used to and the light doesn't come on. Curious to know where the pump is located and if it is only supporting the diff lock? Is it working off vacuum or pressure? The vehicle is stored in Baja and I'm in Utah, so I can't troubleshoot now, but I'm trying to acquire any possible repair parts needed so I can fly down with them when I return to the vehicle in December. Any guidance would be appreciated!
 

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