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34-3
CRUISE CONTROL: 5.3L
14
BLK/WHT
0.35
LT BLU/
BLK
0.35
PPL
0.35
BLK
0.35
DK GRN
0.35
THROTTLE
BODY
Connector
G
H
D
IGN E
Fuse 22
10A
HOT IN RUN AND START
FUSE
BLOCK-
UNDERHOOD
Connector
C2
B6
F
E
B
10
Low
reference
Throttle
position
sensor 2
signal
C1
9
5 volt
reference
11
3
Low
reference
2
1
TCC/brake
switch/cruise
control release
signal
12
PNK
0.35
D
C
STOP
LAMP
SWITCH
Connector
PPL
0.35
FUSE
BLOCK -
UNDERHOOD
Connector
TCC/Brake switch/
cruise control
release signal
PPL
0.35
C2
B10
C3
E3
C2
B5
Throttle
position
sensor 1
signal
ELECTRONIC
BRAKE
CONTROL
MODULE (EBCM)
Connector
GRY
0.35
YEL
0.35
A
16
M
BRN
0.35
C
8
Open
Close
TAC
motor
control 1
TAC
motor
control 2
POWERTRAIN
CONTROL
MODULE
(PCM)
Connector
UART
serial
data
YEL/BLK
0.35
C2
C101
Con-
nector
YEL/BLK
0.35
C2
B1
Vehicle
speed
signal
See Power
Distribution,
page 10-13.
5 volt
reference
ST/LP
Fuse 12
25A
HOT AT ALL TIMES
C9
ORN
1
B
STOP
TCC
A
Turn and
Hazard Lights
WHT
1
C1
Con-
B4
VEH STOP
Fuse 34
15A
See Power
Distribution,
page 10-1.
B5
Trailer
Wiring
LT BLU
0.5
C1
6
Stop Lamp
Supply
Voltage
WHT
1
LT BLU
0.5
FUSE
BLOCK-
REAR
Connector
C1
33
Vehicle
speed
signal
YEL/BLK
0.35
B11
C107
Con-
nector
YEL/BLK
0.35
C2
49
ORN/
BLK
0.35
C1
13
BLU/
WHT
0.35
C1
15
UART
serial
data
UART
serial
data
UART
serial
data
C8
C107
Con–
nector
PPL
0.35
PPL
0.35
THROTTLE
ACTUATOR
CONTROL
(TAC)
MODULE
Connector
Circuit Schematic
34-4
120Ć3
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:
S
The powertrain control module (PCM)
S
The On/Off switch
S
The Resume/Accel switch
S
The Set/Coast switch
S
The TCC brake switch
S
The stop lamp switch
S
The throttle actuator control (TAC) motor
S
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:
S
On/Off
S
Resume/Accel.
S
Set/Coast
The cruise control switches are located on the
multifunction/turn signal lever.
The 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 TAC 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
MPH increments for each time that the Set/Coast is
momentarily pressed, with a minimum vehicle speed of
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 MPH increments for
each time that the Resume/Accel switch is momentarily
activated, with the maximum acceleration total of 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.
Circuit Operation
CRUISE CONTROL: 5.3L
34-5
CRUISE CONTROL: 5.3L
120Ć3
Cruise Control Disengaged
The PCM disengages the cruise control operation
based on the signals from the following switches:
S
The On/Off switch
S
The TCC brake switch
S
The stop lamp switch
The TCC brake switch and the stop lamp switch are
incorporated into an assembly and are mounted to the
brake pedal bracket. Pressing the brake pedal while the
cruise control is engaged will disengaged the cruise
control system. The PCM monitors the TCC brake
switch/cruise control release signal circuit and the
stoplamp switch signal circuit. When the brake pedal is
pressed, the normally closed TCC brake switch opens
and the normally open stoplamp switch closes. The
PCM detects a low signal voltage on the TCC brake
switch/cruise control release signal circuit and detects
a high signal voltage on the stop lamp switch signal
circuit. The cruise control system will disengage when
the cruise control On/Off switch is turned Off. The
vehicle speed stored in the memory of the PCM will be
erased when the cruise control On/Off switch is turned
to Off, or the ignition switch is turned off.
The cruise control system will disengage when the
PCM detects that the driver has the accelerator pedal
override active for approximately 60 seconds. When
the cruise control system is disengaged, the PCM
sends a class 2 message to the IPC in order to
deactivate the cruise control indicator.
Cruise Control Inhibited
The PCM inhibits the cruise control operation when any
of the following conditions exist:
S
A cruise control system related DTC has been set.
S
The vehicle speed is less than 40 km/h (25 mph).
S
The vehicle is in PARK, REVERSE, NEUTRAL, or
1st
gear.
S
The engine RPM low.
S
The engine RPM is high.
S
The vehicle speed is to high.
S
The system voltage is not between 6 volts and 16
volts.
S
The antilock brake system/traction control system
is active for more than 2 seconds.
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:
S
The powertrain control module (PCM)
S
The On/Off switch
S
The Resume/Accel switch
S
The Set/Coast switch
S
The TCC/brake switch
S
The stop lamp switch
S
The throttle actuator control (TAC) module
S
The vehicle speed sensor
Circuit Operation
34-6
CRUISE CONTROL: 5.3L
120Ć3
Cruise Control Engaged
The TAC module monitors the signal circuits of the
following cruise control switches:
S
On/Off
S
Resume/Accel
S
Set/Coast
The PCM will engage and adjust vehicle speed based
on the information received from the TAC module via
the UART serial data link. For further information on the
TAC system, refer to Throttle Actuator Control (TAC)
System Description in Engine Controls--5.3 L.
The cruise control switches are located on the
multifunction/turn signal lever.
Ignition positive voltage is supplied from the 10 ampere
CRUISE 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
TAC module 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
TAC module 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 TAC
sends a UART message to the PCM, in order to confirm
that the cruise control enable criteria has been met. 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
MPH increments for each time that the Set/Coast is
momentarily pressed, with a minimum vehicle speed of
23 MPH. When the normally open Resume/Accel
switch is activated, the switch closes and the TAC
module 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 MPH increments for
each time that the Resume/Accel switch is momentarily
activated, with the maximum acceleration total of 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.
Circuit Operation
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