Question about 2005 Jeep Grand Cherokee
I bought this jeep yesterday. The cruise control turns off when I try to set the speed. It then will not come back on unless I turn off the Jeep and start it back up. It worked for a day and then just started doing this.. I don't believe it is vacuum related, I think it is Cruise switch related.. But I wanted to throw it out there and see what you guys thought. I have a 2005 Jeep Grand Cherokee Laredo with approx:47,000 miles. Just yesterday my cruise control stopped working. When I turn the ignition key off, let it sit for a while, and then turn it back on, the cruise will work momentarily before it fails again. If I let the car sit overnight, my cruise will work for a while before it shuts off. It seems that after the car gets warmed up the cruise on/off switch becomes unresponsive, the indicator light on the dash does not come on, and I am left with no cruise option. I'm not familiure how the cruise control system works, whethere there is some sort of vaccum issue, or electronic issue. I can't imagine that it is an electronic failure, because them my cruise wouldn't work at all. There has to be some connection with why the cruise works when I first start the Jeep, and then after it runs for a while, the cruise indicator light turns off, and the switch becomes un-responsive. Any clues?? I'm hoping this isn't an expesive fix...
You're probably not gonna like this answer, but hwen it comes to electrical problems, you really do need to take it to a garage/mechainc that you trust.
I know I couldn't talk you through what you need to do to fix it, especailly with the Jeep not right in front of me.
If you bought the Jeep from a dealer, take it back there right now, and tell them the cruise troubles you're having...most dealers will fix the problem even on aused car because they want the good news to travel that they took care of you.......they don't want anyone walking around with bad things to say about them.
Good Luck, let us know what ahppens, okay?
Posted on Jan 08, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
The On/Off switch
The Resume/Accel switch
The Set/Coast switch
The TCC brake switch
The stop lamp switch
The throttle actuator control (TAC) motor
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:
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.
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