1999 SUZUKI GRAND VITARA Cruise control actuator

CRUISE CONTROL SYSTEM 8E-1
6F1
6F2
6G
6H
6K
7A
7A1
7B1
7C1
7D
7E
8E
8A
8B
8C
8D
8B
9
10
10A
10B
SECTION 8E
CRUISE CONTROL SYSTEM
CONTENTS
General Description ....................................... 8E-2
Cautions in Servicing ................................... 8E-2
Symbols and Marks ...................................... 8E-2
Abbreviations ............................................... 8E-2
Wiring Color Symbols ................................... 8E-2
Joint Connector ............................................ 8E-2
Fuse Box and Relay ..................................... 8E-2
Power Supply Diagram ................................ 8E-2
Cruise Control System ................................. 8E-3
Cruise control system circuit .................... 8E-3
Components and functions....................... 8E-4
Cancel Conditions .................................... 8E-5
Diagnosis ........................................................ 8E-5
Diagnosis Table ........................................... 8E-5
Note on System Circuit Inspection ............... 8E-7
Cruise Main Switch Indicator Lamp
Circuit Check ................................................ 8E-8
“Cruise” Indicator Lamp Circuit Check ......... 8E-9
Cruise Main Switch, Coast/Set,
Resume/Accel and Cancel Switches
Circuits Check ............................................ 8E-10
VSS Circuit Check ...................................... 8E-11
Stop Lamp Switch (with Pedal Position
Switch) Circuits Check ............................... 8E-12Transmission Range Switch Circuit Check 8E-13
Clutch Pedal Position Switch Circuit Check 8E-14
Throttle Valve Opening Signal Circuit
Check ......................................................... 8E-15
Overdrive and TCC off Command Signal
Circuit Check.............................................. 8E-16
Cruise Control Module Power and Ground
Circuits Check ............................................ 8E-16
Cruise Control Module and Its Circuit
Inspection................................................... 8E-17
Cruise Cable Play Inspection and
Adjustment ................................................. 8E-19
On-Vehicle Service ...................................... 8E-19
Cruise Main Switch .................................... 8E-19
Coast/Set, Resume/Accel and Cancel
Switches..................................................... 8E-20
Vehicle Speed Sensor (VSS) ..................... 8E-20
Transmission Range Switch ...................... 8E-20
Clutch Pedal Position (CPP) Switch .......... 8E-21
Stop Lamp Switch (with Pedal Position
Switch) ....................................................... 8E-22
Cruise Control Actuator Assembly
(with Control Module) ................................. 8E-23
Cruise Cable .............................................. 8E-24

WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System:
Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).

CRUISE CONTROL SYSTEM 8E-3
Cruise Control System
The cruise control system is a device which maintains a preset vehicle speed while driving at a high speed, e.g.,
on a highway. It allows the driver to drive his vehicle at a constant speed of 40 km/h (25 mile/h) or higher without
depressing the accelerator pedal (constant cruising). The system also has such functions as to change the vehi-
cle speed without operating the accelerator pedal (but using SET COAST and ACCEL RESUME switches), can-
cel cruise control (CANCEL switch) and resume the speed in memory automatically after cruise control is
cancelled (ACCEL RESUME switch). The system mainly consists of a vehicle speed sensor, an actuator
assembly incorporated with control module, cruise main switch, SET COAST switch, ACCEL RESUME switch
and CANCEL switch, etc.
Cruise control system circuit
Refer to Section 8A.
1. Cruise main switch 6. PCM / ECM
1-1 Cruise main switch indicator lamp 7. Stop lamp switch (with brake pedal position switch)
2.“CRUISE” Indicator light 8. Clutch pedal position switch (M/T vehicle)
3. SET COAST/ACCEL RESUME/CANCEL switch 9. Automatic transmission
4. Vehicle speed sensor 10. Transmission range switch (Park/Neutral position switch) (A/T vehicle)
5. Cruise control actuator assembly (with control module)

8E-4 CRUISE CONTROL SYSTEM
Components and functions
Component Function
Cruise control actuator
assembly with control mod-
uleCruise control module:
Executes centralized control by means of a microcomputer over all functions
including setting a constant speed, resuming it, setting coast, limiting minimum
speed and cancelling cruise control.
Cruise control actuator (stepping motor & clutch) :
Actuates accelerator pedal through cruise cable and arm according to a signal
from cruise control module to control vehicle speed.
Cruise main switch This switch has a momentary contact type button to turn the cruise control
system ON and OFF.
SET COAST switch When this switch is rotated (ON) and then released (OFF) while vehicle is run-
ning at a speed 40 km/h (25 mile/h) or higher, vehicle speed at that OFF
moment is stored in memory and it is maintained (constant cruising).
Rotating this switch (ON) continuously during constant cruising keeps slowing
down vehicle speed as long as it is ON. When it is released (OFF), vehicle
speed at that moment is stored in memory and vehicle starts constant cruising.
ACCEL RESUME switch When this switch is rotated (ON) during constant cruising, vehicle speed keeps
increasing as long as it is ON. When it is released (OFF), vehicle speed at that
moment is stored in memory and vehicle starts constant cruising. If vehicle
speed is higher than 40 km/h (25 mile/h) after cruise control is cancelled, turn-
ing this switch ON momentarily will resume the speed at which vehicle was run-
ning before cancellation.
CANCEL switch When this switch is pressed (ON), cruise control (accelerator pedal control) is
cancelled.
Vehicle speed sensor (VSS) The vehicle speed sensor (VSS) is mounted on the transfer or transmission.
The VSS converts vehicle speed into pulse signal and send it to the cruise con-
trol module.
Stop lamp switch The stop lamp switch has 2 contact points. One contact point closes when the
brake pedal is depressed to light the stop lamp and provides a voltage signal to
the cruise control module. This signal, when inputted cancels cruise control
(sets the accelerator pedal free).
The other contact point (brake pedal position switch) opens when the brake
pedal is depressed, to shut off the power to the magnetic clutch in the actuator,
thereby cancelling cruise control (setting the accelerator pedal free).
This switch is installed to cancel cruise control (constant cruising) without fail.
Clutch pedal position switch
(M/T vehicle only)When the clutch pedal is depressed, the clutch pedal position switch closes and
provides a ground signal to cruise control module.
The cruise control module cancels cruise control (accelerator pedal control)
when this signal is inputted.
Transmission range switch
(Park/Neutral position switch)
(A/T vehicle only)When the selector lever is places in either “P” or “N” position, the transmission
range switch closes and provides a ground signal to cruise control module. The
cruise control module cancels cruise control (accelerator pedal control) when
this signal is inputted.
PCM – Throttle opening sig-
nal (4 A/T vehicle only)Throttle opening signal is inputted from PCM.
From this signal, the cruise control module detects the throttle opening and
uses it as one of the factors to output the overdrive and TCC OFF command sig-
nal to PCM.

CRUISE CONTROL SYSTEM 8E-5
Cancel Conditions
Constant cruising is cancelled under the following conditions.
•Ignition switch is turned OFF.
•Cruise main switch is turned OFF.
•Vehicle speed has slowed down to lower than minimum operating speed (40 km/h (25 mile/h)).
•*Vehicle speed varies beyond cancel speed range (–15 km/h, –9 mile/h) from preset speed.
•*Brake pedal is depressed. (Stop lamp switch is turned ON).
•*Clutch pedal is depressed (Clutch pedal position switch is turned ON) (For M/T vehicle).
•*Selector lever is shifted to N range (Park/Neutral position switch in transmission range switch is turned ON).
•*CANCEL switch is turned ON.
Diagnosis
Diagnosis Table
PCM – Overdrive and TCC
off command signal outputWhen the throttle opening for the vehicle speed exceeds the specified value
during cruise control, the cruise control module sends this signal to PCM. PCM
uses this signal as one of signals to control 4-A/T.
Cruise main switch indicator
lampIn the state with the ignition switch ON and the cruise control system OFF,
pressing this switch once and releasing it will activate the cruise control system
and the cruise control module will cause the indicator lamp to light up.
“CRUISE” indicator lamp It lights up when cruise control (accelerator pedal control) is functioning. Component Function
NOTE:
When constant cruising is cancelled under above any condition with * (asterisk), vehicle speed before
cancellation can be resumed by operating ACCEL RESUME switch, provided that vehicle speed is
higher than 40 km/h (25 miles/h).
Condition Possible Cause Correction
Main switch indicator
lamp fails to light up
or remains ON.Main switch indicator lamp circuit faulty Refer to “CRUISE MAIN SWITCH INDI-
CATOR LAMP CIRCUIT CHECK” in this
section.
Cruise control module power and ground
circuits faultyRefer to “CRUISE CONTROL MODULE
POWER AND GROUND CIRCUIT
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
“CRUISE” indicator
lamp fails to light up
or remains ON.“CRUISE” indicator lamp circuit Refer to ““CRUISE” INDICATOR LAMP
CIRCUIT CHECK” in this section.
Cruise control module power and ground
circuitsRefer to “CRUISE CONTROL MODULE
POWER AND GROUND CIRCUIT
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.

8E-6 CRUISE CONTROL SYSTEM
Vehicle speed can not
be set.Actuator cable play maladjusted or actua-
tor cable faultyRefer to “CRUISE CABLE PLAY
INSPECTION AND ADJUSTMENT” in
this section.
Main switch, “COAST/SET”, “RESUME/
ACCEL” and “CANCEL” switch circuits
faultyRefer to “CRUISE MAIN SWITCH,
COAT/SET, RESUME/ACCEL AND
CANCEL SWITCHES CIRCUITS
CHECK” in this section.
VSS circuit faulty Refer to “VSS CIRCUIT CHECK” in this
section.
Stop lamp switch circuit faulty Refer to “STOP LAMP SWITCH (WITH
PEDAL POSITION SWITCH) CIRCUITS
CHECK” in this section.
Transmission range switch circuit (4 A/T
model only) faultyRefer to “TRANSMISSION RANGE
SWITCH CIRCUIT CHECK” in this sec-
tion.
Clutch pedal position switch circuit faulty Refer to “CLUTCH PEDAL POSITION
SWITCH CIRCUIT CHECK” in this sec-
tion.
Cruise control module power and ground
circuits faultyRefer to “CRUISE CONTROL MODULE
POWER AND GROUND CIRCUIT
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
Vehicle set speed is
unstable.Actuator cable play maladjusted or actua-
tor cable faultyRefer to “CRUISE CABLE PLAY
INSPECTION AND ADJUSTMENT” in
this section.
VSS circuit faulty Refer to “VSS CIRCUIT CHECK” in this
section.
Throttle valve opening signal circuit faulty Refer to “THROTTLE VALVE OPENING
SIGNAL CIRCUIT CHECK” in this sec-
tion.
Actuator assembly faulty Replace actuator assembly.
Actual vehicle speed
deviates above or
below set speed.Actuator cable play maladjusted or actua-
tor cable faultyRefer to “CRUISE CABLE PLAY
INSPECTION AND ADJUSTMENT” in
this section.
Throttle valve opening signal circuit faulty Refer to “THROTTLE VALVE OPENING
SIGNAL CIRCUIT CHECK” in this sec-
tion.
Actuator assembly faulty Replace actuator assembly.
Acceleration or decel-
eration by using
“RESUME/ACCEL” or
“COAST/SET” switch
is not attained.Main switch, “COAST/SET”, “RESUME/
ACCEL” and “CANCEL” switch circuits
faultyRefer to “CRUISE MAIN SWITCH,
COAT/SET, RESUME/ACCEL AND
CANCEL SWITCHES CIRCUITS
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
Cruise control is not
cancelled even when
“CANCEL” switch is
operated.Main switch, “COAST/SET”, “RESUME/
ACCEL” and “CANCEL” switch circuits
faultyRefer to “CRUISE MAIN SWITCH,
COAT/SET, RESUME/ACCEL AND
CANCEL SWITCHES CIRCUITS
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly. Condition Possible Cause Correction

CRUISE CONTROL SYSTEM 8E-7
Note on System Circuit Inspection
Refer to “PRECAUTION FOR ELECTRICAL CIRCUIT SERVICE” in Section 0A. “RESUME/ACCEL”
switch fails to resume
preset vehicle speed
after cruise control is
cancelled.Main switch, “COAST/SET”, “RESUME/
ACCEL” and “CANCEL” switch circuits
faultyRefer to “CRUISE MAIN SWITCH,
COAT/SET, RESUME/ACCEL AND
CANCEL SWITCHES CIRCUITS
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
Cruise control is not
cancelled even when
brake pedal is
depressed.Stop lamp switch circuit faulty Refer to “STOP LAMP SWITCH (WITH
PEDAL POSITION SWITCH) CIRCUITS
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
Cruise control is not
cancelled even when
clutch pedal is
depressed.Clutch pedal position switch circuit faulty Refer to “CLUTCH PEDAL POSITION
SWITCH CIRCUIT CHECK” in this Sec-
tion.
Actuator assembly faulty Replace actuator assembly.
Cruise control is not
cancelled even when
selector lever is
shifted to “N” posi-
tion.Transmission range switch circuit (4 A/T
model only) faultyRefer to “TRANSMISSION RANGE
SWITCH CIRCUIT CHECK” in this sec-
tion.
Actuator assembly faulty Replace actuator assembly.
4 speed A/T gear shift-
ing is frequent
between 3rd and over-
drive when driving on
uphill road (Hunting).Throttle valve opening signal circuit faulty Refer to “THROTTLE VALVE OPENING
SIGNAL CIRCUIT CHECK” in this Sec-
tion.
Overdrive and TCC off command signal
circuit faultyRefer to “OVERDRIVE AND TCC OFF
COMMAND SIGNAL CIRCUIT CHECK”
in this section.
Actuator assembly faulty Replace actuator assembly.
4 speed A/T is not
shifted to overdrive
gear even though not
on uphill road.Throttle valve opening signal circuit faulty Refer to “THROTTLE VALVE OPENING
SIGNAL CIRCUIT CHECK” in this sec-
tion.
Overdrive and TCC off command signal
circuit faultyRefer to “OVERDRIVE AND TCC OFF
COMMAND SIGNAL CIRCUIT CHECK”
in this section.
Actuator assembly faulty Replace actuator assembly. Condition Possible Cause Correction

CRUISE CONTROL SYSTEM 8E-19
Cruise Cable Play Inspection and Adjustment
INSPECTION AND ADJUSTMENT
1) Remove actuator cap.
2) With actuator lever (1) returned at original position (2)
(Where lever does not move clockwise any further), check
cruise cable for play.
If it is out of specification, adjust it as follows
Cruise Cable play “a” :
1 – 2 mm (0.04 – 0.08 in.)
3) Loosen cable lock nut (3).
4) Adjust cable play to specified value by turning adjusting nut
(4).
5) Tighten lock nut (3) securely after adjustment.
On-Vehicle Service
Cruise Main Switch
REMOVAL
1) Disconnect negative (–) cable at battery.
2) Remove meter cluster hood (1) by removing its mounting
screws (2).
3) Remove cruise main switch (3) from instrument panel.
4) Disconnect connector from cruise main switch (3).
INSPECTION
1) Check for resistance between “IG” and “LOAD” terminals.
If check result is not satisfactory, replace.
Cruise main switch specification
Switch button released : Infinity
Switch button pressed : About 3.9 kΩ
ΩΩ Ω
INSTALLATION
Reverse removal procedure for installation.
1
LOAD
IG

CRUISE CONTROL SYSTEM 8E-23
Cruise Control Actuator Assembly (with Con-
trol Module)
REMOVAL
1) Disconnect negative (–) cable at battery.
2) Disconnect connector from actuator assembly (2) (with con-
trol module).
3) Remove actuator cap (1) from actuator assembly (2).
4) Disconnect cruise cable (3) from actuator assembly (2).
5) Remove actuator assembly (2) from vehicle.
INSPECTION
Move actuator lever (1) by hand and check its operation as
described below.
1) Actuator lever (1) should not turn clockwise.
2) Actuator lever (1) should turn smoothly by about 1/3 rotation
counterclockwise and contact internal stopper.
3) When hand is taken off from actuator lever (1) at the position
in 2) above, it should return to its original position (2) by
return spring force. If actuator lever (1) does not operate as
described above, replace it.
INSTALLATION
Install actuator assembly by reversing removal procedure, noting
the following point.
•Adjust cruise cable play to specification referring to “CRUISE
CABLE PLAY INSPECTION AND ADJUSTMENT” in this
section. CAUTION:
Never disassemble cruise control actuator assembly.
Disassembly will spoil its original function.