First, what if you are asked to turn it on, but only on one AP? Why in the world would you do that, as location works with several access points, may remain a mystery. More likely, you could be asked to turn the feature on for a series of access points, or turn it on globally and disable it for a couple of access points. From the CLI, you would use:
config advanced {802.11a | 802.11b} ccx location-meas global enable
This enables the CCX location measurement feature for the given radio, with an interval you can define (the same interval option appears in the Web interface when you check the Location Measurement option box). Default interval is 60 seconds, range is 60 to 32400 seconds.
Okay, so this enables or disables the feature globally. You can override this global feature, on a per AP radio basis, with the command:
config advanced {802.11a | 802.11b} ccx customize AP_name {on | off}
This turns it on or off on a specific AP radio (regardless of the global config).
If what you want to do is configure a specific interval for one AP, use:
config advanced {802.11a | 802.11b} ccx location-meas ap AP_name enable interval_seconds
You can also use the disable form of this command to turn the location measurement feature off on one specific AP, which creates the same effect as the "customize off" option.
You can check this configuration with the usual series of related show commands:
show advanced {802.11a | 802.11b} ccx global
show advanced {802.11a | 802.11b} ccx ap AP_name