1997 VW Eurovan Cruise Control

Take a good hard look at the question you just asked and then tell us what CRITICAL information is missing

cruise controls are governed by 5 settings and sensors
one is engine rpms
vehicle road speed ,( manual transmission will not activate under 20 klms /hr
brake pedal switch
clutch pedal switch ( VSS if auto)
off/on switch control
any one of these not lined up will not allow the cruise control to work

It is HVAC 1fuse #39 in the rear fuse block ,this powers the on/off switch for cruise control ! Fuse Block - Rear Beneath the left rear seat. What engine does it have ? 4.2 L or 5.3 l There is no vacuum involved in the operation of the cruise control ! Your vehicle has electronic throttle control .
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at vehicle speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the Cruise Control System:
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The powertrain control module (PCM)

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The On/Off switch

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The Resume/Accel switch

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The Set/Coast switch

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The TCC brake switch

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The stop lamp switch

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The throttle actuator control (TAC) motor

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The vehicle speed sensor

Cruise Control Engaged
The cruise control system will engage and adjust the vehicle speed based on the activation of the following cruise control switches:
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On/Off

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Resume/Accel.

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Set/Coast

The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.
Ignition positive voltage is supplied from the 10 ampere HVAC 1 fuse to the cruise control switch via the ignition 3 voltage circuit. When the normally open cruise control On/Off switch is turned On, the switch closes and the PCM detects a high signal voltage on the cruise control on switch signal circuit. When the normally open Set/Coast switch is pressed, the switch closes and the PCM detects a high signal voltage on the cruise control set/coast switch signal circuit. To engage the cruise control system, turn the On/Off switch On and momentarily press the Set/Coast switch. The PCM will confirm that the cruise control enable criteria has been achieved. The PCM will engage the cruise control system and record the selected vehicle speed. The PCM sends a class 2 message to the instrument panel cluster in order to illuminate the cruise control indicator. Pressing the accelerator pedal, while the cruise control system is engaged, will allow the driver to override the cruise control system in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed. The driver can also override the current set vehicle speed via the Set/Coast switch and the Resume/Accel switch. When the cruise control system is engaged, pressing and holding the Set/Coast switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the cruise control system. When the Set/Coast switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily pressing the Set/Coast switch will allow the vehicle to decelerate at 1.6 km/h (1 mph) increments for each time that the Set/Coast is momentarily pressed, with a minimum vehicle speed of 37 km/h (23 mph). When the normally open Resume/Accel switch is activated, the switch closes and the PCM detects a high signal voltage on the cruise control resume/accel switch signal circuit. Activating and holding the Resume/Accel switch, when the cruise control system is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the Resume/Accel switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily activating the Resume/Accel switch will allow the vehicle to accelerate at 1.6 km/h (1 mph) increments for each time that the Resume/Accel switch is momentarily activated, with the maximum acceleration total of 16 km/h (10 mph) over the current set vehicle speed . Momentarily activating the Resume/Accel switch, after the cruise control system has been disengaged by pressing the brake pedal, will recall the previous set vehicle speed that is recorded in the PCM.

First thing would be to check the fuse. If the fuse is good, use a voltmeter and test the power to the cruise control with power on. If you have power, then test the cruise control unit with a vacuum pressure tester.

sounds like a switch not working right in the cruise control take it back to the guy who "fixed it" and get him to "fix it" right this time,, its likley to be the brake switch sticking on, this wont let the auto cruise control engage, it keeps thinking you are trying to brake to slow down so it kicks its self out just as it should if you were driving in auto cruise you then need to reset it to go back into auto cruise

I had a similar problem and it turned out to be the brake fluid level. This may be an answer. Also have you had the brakes checked. The cruise control is integrated with the brakes. Any little thing wrong with them effects the cruise.

That toggle switch is for the security system. That year miata never came with any switches for the soft top of any kind. Most likely that is an aftermarket alarm system. Most factory alarm systems do not come with a toggle switch.

Hi, should be fuse no. 15 which is a 10amp located rt side of steering wheel behind removable bin

First off CK your curise control throttle cable. You should start at the throttle body where the two cables connect to it. (throttle and cruise control cables) This is where I have found is the most common problem is located. Make sure the curise cable is connected and not broken or cut. I have found this to be a very common problem.
If you find them intact. Then its too easy from there. Just trace the cable back to the electric motor that works the cable and so forth. From my experiance your problem is mechanical not electrical.