Hummer H3. Manual — part 938

Fig. 15: Exploded View Of Clutch Release Switch
Courtesy of GENERAL MOTORS CORP.

2. Complete the following in order to remove the clutch release switch (4) from the clutch

pedal bracket (1):

1. Rotate the switch (4) counterclockwise.

2. Pull the switch (4) from the retainer (5).

3. Push the locking tabs inward to release the retainer (5).

Installation Procedure

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Cruise Control - H3

Fig. 16: Exploded View Of Clutch Release Switch
Courtesy of GENERAL MOTORS CORP.

1. Slide only the clutch release switch retainer (5) into the clutch pedal bracket (1), until the

locking tabs are fully engaged.

2. Adjust the clutch release switch. Refer to Clutch Pedal Cruise Control Release Switch

Adjustment.

DESCRIPTION AND OPERATION

CRUISE CONTROL DESCRIPTION AND OPERATION

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Cruise Control - H3

Cruise control is a speed control system that maintains a desired vehicle speed under normal
driving conditions at 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 clutch release switch, if equipped with a manual transmission

The cruise control switch

The powertrain control module (PCM)

The stop lamp switch

The torque converter clutch (TCC) brake/cruise release switch

The throttle actuator control (TAC) motor

The vehicle speed sensor (VSS)

Cruise Control Engaged

The Cruise Control System will engage and adjust vehicle speeds, based on the activation of the
following cruise control switches:

The on/off switch

The resume/accel switch

The set/coast switch

The powertrain control module (PCM) monitors the cruise control set/coast and resume/accel
switch signal circuit in order to determine when to capture and maintain the vehicle speed. The
PCM monitors the vehicle speed sensor signal circuit in order to determine the vehicle speed. The
PCM uses the throttle actuator control (TAC) motor in order control the vehicle speed. For
further information on the TAC System, refer to Throttle Actuator Control (TAC) System
Description .

Ignition voltage is supplied to the cruise control switch from the 10 ampere CRUISE fuse via the
ignition 1 voltage circuit. The cruise control switches are arranged in a resistive ladder, with each
cruise control function switch having a different resistance value. The PCM detects a specific
voltage value that is associated with the cruise control function switch being activated. When the
normally open cruise control On/Off switch is turned ON, the switch closes and the PCM detects
a predetermined voltage signal on the cruise control switch signal circuit indicating that the
On/Off switch is active. Similarly, when the normally open set/coast switch or the normally open
resume/accel switch are activated, the PCM detects the pre determined voltage signal on the
cruise control set/coast and resume/accel switch signal circuit. To engage the Cruise Control

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Cruise Control - H3

System, press the cruise On/Off switch ON and momentarily press the set/coast switch. The PCM
will confirm that the cruise control criteria has been met. The PCM will record the vehicle speed
and send a class 2 message to the instrument panel cluster (IPC) in order to illuminate the cruise
control indicator. The set/coast switch and the resume/accel switch will remain inactive when the
PCM has not received the predetermined voltage signal from the On/Off switch. 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 switch is
momentarily pressed, with a minimum vehicle speed of 37 km/h (23 mph). 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 Disengaged

The powertrain control module (PCM) disengages the cruise control operation based on the
signals from the following switches:

The stop lamp switch

The torque converter clutch (TCC) brake/cruise release switch

The clutch release switch, if equipped

The cruise control On/Off switch

The TCC brake/cruise release switch and the stop lamp switch are mounted on the brake pedal
bracket. When the brake pedal is applied, the normally closed TCC brake/cruise release switch
opens and the normally open stop lamp switch closes. The PCM detects a low signal voltage on
the TCC brake/cruise release switch signal circuit and a high signal voltage on the stop lamp

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Cruise Control - H3