<pre>Volgens <a href="
www.swedishbricks.net/700900FAQ/Electric...isengages/Re-engages
">deze website is het zo, dat als je bulb failure sensor relay in je relaiskast kapot is, dat je cruise control dan geen massa krijgt. Ik zou dit relais dus controleren. In de 740 en 940 serie is dit relais nummer A (achter de asbak). In de 760 en 960 relais F, in deze auto paneel onder handschoenvak verwijderen, relaiskast zit aan de rechterkant van de middenkonsole.
Of dit relais is helemaal dood, of een koud soldeerpunt. Eerst maar eens doorsolderen, anders nieuw bij de dealer of uit een sloper.
Op de website zoals genoemd staat dit:
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Cruise Control Won't Work or Incorrectly Disengages/Re-engages. [Response 1:] Most common problem that I have seen is either split or disconnected vacuum hose, or mis-adjusted brake switch (at the pedal) or clutch switch (if manual tranny). Sometimes it is simply that the brake or clutch pedal is not fully returning - try lifting up on the pedal with your foot while driving and see if you can engage the cruise. In addition to the vacuum switch, check for operation of the brake light switch. I seem to remember that the vacuum switch will disengage the cruise simply by releasing the vacuum from the unit, but the brake light switch must activate in order to release the control unit signal. If you are just tapping the brake lightly to disengage the cruise (as I often do), but not activating the brake light switch, then it may simply re-engage as soon as vacuum is applied again.</font> <font face="Arial,Helvetica">[Response 2:] Pull hose loose at "T" fitting aft of throttle servo. Apply vacuum (suck on it, but make sure no one's watching) to fitting with hoses that run down to pump and into car to brake pedal defeat switch. If leaks are detected here then find split hose or go inside and find pedal switch fault. If no leaks detected then closely inspect the servo for splits or tears. The likelihood of electrical trouble is far lower than having a hose split or a leaking servo.</font>
<font face="Arial,Helvetica">[Query:] The cruise control on my sister's 1993-944 will engage only about 10% of the time it is activated. Per past posts I checked all the vacuum lines and the servo with a Mityvac tester and they hold a vacuum, indicating no leaks. I also checked the functions of the cruise switch on the turn signal lever, by disconnecting the harness connector, with an ohm meter and it checks out. The fuse is also ok. I tried to use the "B" diagnostic socket with the wire put in the #2 hole. I turned on the ignition and pressed the button and nothing happened, no codes flashed, not even a 1-1-1.</font> <font face="Arial,Helvetica">[Response 3:] There is a separate switch with a vacuum line attached for the cruise. If the car is manual tranny, the car would have two switches, one for each pedal. If the switch adjustment is marginal, i.e., there is not a definite “off”, then the switch needs to be adjusted. It is adjusted the same way as the brake switch.</font>
<font face="Arial,Helvetica">[Response 4:] Mine did the same thing and the problem was the bulb failure relay/device in the relay compartment. When this fails there is no ground for the cruise and the brake lights won't work.</font>
Succes!
Arvid </pre>
