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 .
The cruise control switches are located on the multifunction/turn signal lever.
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:
?€¢
The powertrain control module (PCM)
?€¢
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:
?€¢
On/Off
?€¢
Resume/Accel.
?€¢
Set/Coast
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.
Cruise Control Inoperative/Malfunctioning (4.2L) Diagnostic Aids
Perform the following in order to avoid misdiagnosis:
• Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
• EMI on the speed sensor signal circuit may cause erratic cruise control operation.
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
If you don't have a factory scan tool , I wouldn't mess with it !
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Press the cruise On/Off switch Off.
With the scan tool, observe the Cruise On/Off Switch parameter in the powertrain control module (PCM) Cruise Control Data list.
Does the Cruise On/Off Switch parameter display Off?
×
SOURCE: Cruise control switch won't work on a 2003 Alero
if it worked before i would chk. the fuse, there will be one for it, but if its blowen something made it do it. i would replace it, and if it blows again, you will have to find the cause, could be switch.
SOURCE: 2003 expedition cruise control inoperative
I had this same Problem and it was a simple vaccuum hose leak connected to the cruise control module. Try replacing this small hose.
SOURCE: 2003 Denali Yukon, no Brake lights, no Cruise Control, fuse is OK
Check your brake light switch at the pedal. This controls the lights and disengages the cruise when stopping. I'd look there before I go anywhere else. There may just be a wire loose. Could be a simple fix.
Good Luck and hope this helps.
SOURCE: 2003 expedition cruise control inoperative no
I'm having the same issue with mine. Just checked both fuses #5 and #12 under the dash, but both are fine. Can't find Relay #302 for the speed servo. 2003's aren't listed in the recall. Ugh!
SOURCE: Where is the cruise control fuse for GMC Envoy
its in the fuse panel under the hood there should be a chart on the cover
700 views
Usually answered in minutes!
×