Cruise Control Systems - Hummer H1 Service Manual

12-134.4 Electrical System

CRUISE CONTROL SYSTEMS

WARNING: Testing of cruise control should only be
preformed in areas were traffic is light and the road
conditions are stable.
Figure 12-130.1 : Cruise Control
Operation of Cruise Control
1. Move the cruise control switch to the "ON" position.
2. Accelerate to the desired speed.
3. Push in the "SET" button on the end of the turn signal
lever and release it at the desired speed. This will set the
vehicle speed. NOTE: The vehicle speed will decrease
while the "SET" button is pushed in .
The cruise control will not operate under 35 MPH.
Accelerating with the Cruise Control On
Vehicle speed can be momentarily increased after the desired
speed has been set. By pressing the accelerator pedal the speed
will increase. This action will not interfere with the preset
cruising speed. The preset speed will resume after the accelera-
tor pedal is released.
Resetting the Cruise Control to a Higher Speed
There are two ways to reset the cruise control to a higher
speed.
1. Press the accelerator pedal until the desired speed is
reached. Push the "SET" button and release it. Speed
should set like normal.
2. Move the cruise control switch from "ON" to "R/A". Hold
the switch in place until you reach the desired speed and
then hold the control switch in the "R/A" position for half
a second and release. Each time this is done the vehicle
speed will increase by 1 MPH.
Turning Off the Cruise Control
There are two ways to turn the cruise control off while driving:
1. Move the cruise control switch to the "OFF" position.
2. Depress the brake pedal slightly. This turns off the cruise
control operation. but does not erase the speed memory.
To resume cruise control after touching the brake pedal,
follow the instructions under "Resuming a set Speed".
3-1-01
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In addition, the cruise control is automatically disabled each
time you turn the engine off, Or shift into "P" (Park) "N" (Neu-
tral) position, or if the "Check Throttle Light" is illuminated.
Resuming a Set Speed
If the cruise control was turned off by depressing the brake
pedal slightly, move the cruise control switch from "ON" to
"R/A" and hold for approximately one second and release. The
vehicle will gradually return to the previously set speed and
maintain it.
Resuming a set speed will not function if the cruise control was
9-OM2-031
turned off using the cruise control switch, or if the vehicle
speed is below cruise control minimum (35 MPH).
Using Cruise Control on Hills
Driving on a hill can affect the performance of the cruise con-
trol. This performance can be greatly affected if the vehicle is
loaded or towing a trailer. Use of the accelerator pedal will
help maintain vehicle speed but brakes will turn cruise off. If
vehicle speed is being significantly reduced or increased when
using the cruise control on a hill, turn the cruise control off
and manually control the vehicle speed.
Inspection
When working on the cruise control system make sure that
there are no other problems with the PCM or fueling system.
Always road test and verify the problem before attempting any
repairs.
Intermittent problems
All of the charts in this section are for use on current failures.
Do not attempt to use these charts to diagnose a problem unless
the problem has been verified and currently exists. If the prob-
lem is intermittent, parts will be replaced, or no problem will
be found.
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