Hi John.....welcome to the Forum
Here is some information I have found for the system:
To turn the CMBS off, press the CMBS OFF switch on the dashboard for about 1 second. When you do this, a beeper sounds, a CMBS indicator on the instrument panel comes on, and a CMBS OFF message appears on the multi-information display. To turn the system back on, press the switch again for about 1 second.
Generally, the system should switch on every time you cycle the ignition