My 2003 Volvo S80 cruise control workds sporadically.
My 2003 Volvo S80 cruise control initially operates correctly, and then disengages after 5 to 10 minutes - and will not reactivate until the ignition has been turned off. Thereafter, the same pattern recurs.
Your solutions to this irritating problem would be much appreciated!
Re: My 2003 Volvo S80 cruise control workds sporadically.
On my 2002 S80 T6, the problem is the brake booster diaphragm position sensor's failure (Volvo 2002 S80 T6 part #31261486--other years, models might be different). This is essentially a piston-driven potentiometer that tells the cruise control system when you've applied the brakes, signaling it to switch off control of the throttle. It's mounted on the back of the brake booster with a wire circlip. It's not easy to get at, and I had to remove the cross-brace between the shock mounts to get at it more easily. The part's about $90 from online parts sources, more at the dealer, plus my dealer wanted a king's ransom to install, $400, parts and labor! While not easy to get to, it's fairly easy to replace--just BE SURE to pump the brakes a lot, engine off, before removing it so that residual booster vacuum won't **** the rubber o-ring around the sensor's cylindrical body into the booster chamber. Hardest, most aggravating part is removing and replacing that steel circlip that holds the sensor in place. Dropping that little steel band into the back of the engine bay kicks off a whole new adventure!
Re: My 2003 Volvo S80 cruise control workds sporadically.
If you get ABS/STC codes on your dash at the same time it may be the ABS module. The symptom you describes with the codes necessitated a repair of my ABS module. I went to vicrocha online and had mine back in less than a week and works now after 5 years
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It's probably a problem with cruise control module , located under the hood in engine compartment . Or a bad connection somewhere . Do you know how to do electrical testing ? Is the air bag light lit on the instrument cluster ?
Could have DTC'S - diagnostic trouble code's stored .
The powertrain control module (PCM) inhibits cruise control operation when certain conditions are not appropriate for cruise control operation. The PCM removes the ground from the cruise control inhibit signal circuit in order to disengage cruise control operation.
Output driver modules (ODMs) are used by the powertrain control module (PCM) in order to turn on many of the current driven devices that are needed to control various engine and transaxle functions. DTC P1558 set indicates that an improper voltage level has been detected on the signal circuit which controls the cruise control inhibit circuit.
Action Taken When the DTC Sets
• The PCM will not illuminate the malfunction indicator lamp (MIL).
• The PCM will store the conditions present when the DTC set as Failure Records data only.
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades may cause variations in the selected speeds. The electronic cruise control system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and TAP-UP or TAP-DOWN.
The main parts of the cruise control system are:
• The cruise control module assembly
• The function control switches
• The cruise control release switch
• The clutch pedal position switch (CPP), if equipped
• The stop lamp switch assembly
• The vehicle speed sensor
The cruise control system uses the cruise control module assembly to maintain the desired vehicle cruise speed and operation. The cruise control module assembly has an electronic controller and an electric stepper motor to vary the throttle in each different cruise control mode. The electric controller monitors vehicle speed and operates the electric stepper motor. The stepper motor operates in response to the electronic controller, to maintain the desired cruise speed. The electric stepper motor moves a strap that is attached to the cruise control cable which moves the throttle linkage. The cruise control module assembly contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph). The module assembly is not serviceable.
everything that youre describing is controlled by the bcm(body controll module). if that many things ahve gone out, it is likely and most probable that the unit has burned out. you can get one from a slavage yard. make sure the numbers match and if i remember correctly, you may have to get it programmed through the volvo system at the dealer only.
having the same problem with my 1999 s80 2.9 . replaced the abs module twice and still get the brake failure warning. when the ignition key is turned there is a clicking sound from the center console beneath the shifter, then the brake failure warning, and the car will not start. (also after the last abs module replacement the car sometimes gets stuck in park).