heater mode SUZUKI GRAND VITARA 2000 2.G Service Workshop Manual

YH4
GRAND
VITARA
1A
HEATER AND VENTILATION 1A-1
SECTION 1A
HEATER AND VENTILATION
WARNING:
For vehicles equipped with Supplement Restraint (Air Bag) System

Service on and around the air bag system components or wiring must be performed only by an autho-
rized SUZUKI dealer. Refer to ªAir Bag System Components and Wiring Location Viewº under ªGener-
al Descriptionº in air bag system section in order to confirm whether you are performing service on
or near the air bag system components or wiring. Please observe all WARNINGS and ªService Precau-
tionsº under ªOn-Vehicle Serviceº 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 or 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
ªLOCKº 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).
NOTE:
The link mechanism of the heater varies depending on the specifications.
CONTENTS
GENERAL DESCRIPTION1A- 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Body Ventilation1A- 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSIS1A- 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis Table1A- 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Circuit1A- 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE1A- 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Unit1A- 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor1A- 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Relay1A- 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Resistor1A- 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Mode Control Switch1A-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Mode Control Actuator1A-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Control Lever Assembly 1A-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Control Cables1A-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Unit1A-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Duct1A-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

YH4
GRAND
VITARA
1. Side ventilator outlet
2. Side defroster outlet
3. Center ventilator outlet
4. Heater unit
5. Defroster duct6. Ventilator duct
7. Heater control lever assembly
8. Heater mode control switch
9. Blower unit
10. Rear duct
1A-2 HEATER AND VENTILATION
GENERAL DESCRIPTION
The heater, an in and out air selectable-type hot water heater, is so constructed that it is possible to assure an
agreeable ventilation at all times by providing the ventilator air outlets at the center and both sides (right and left)
of the instrument panel, the hot air outlet at a place close to the feet of front passengers, and the defroster air outlets
at places, right and left, along the windshield glass.
The heater and ventilation consist of following parts.

YH4
GRAND
VITARA
HEATER AND VENTILATION 1A-3
BODY VENTILATION
The body ventilation system of this vehicle has a fresh air intake located at the cowl top panel. When fresh air intake
control lever is at FRESH AIR position, ventilating air is drawn into the interior from the cowl center garnish and
drawn out from the ventilator outlet provided at each side body outer panel (both right and left side).
DIAGNOSIS
DIAGNOSIS TABLE
TroublePossible causeRemedy
Heater blower won't
work even when its
switch is ON.Blower fuse blown
Blower resistor faulty
Blower motor faulty
Wiring or grounding faultyReplace fuse to check for short.
Check resistor.
Replace motor.
Repair as necessary.
Incorrect temperature
output.Control cables broken or binding
Air damper broken
Air ducts clogged
Heater radiator leaking or clogged
Heater hoses leaking or cloggedCheck cables.
Repair damper.
Repair air ducts.
Replace radiator.
Replace hoses.
When mode control
switch is changed,
air outlet port is not
changed.Mode control switch faulty
Mode actuator faulty
Fuse blown
Wiring or grounding faulty
Air damper broken
Air ducts cloggedCheck and replace as necessary.
Check and replace as necessary.
Replace fuse to check for short.
Repair as necessary.
Repair damper.
Repair air ducts.

YH4
GRAND
VITARA
1A-4 HEATER AND VENTILATION
FOR LH VEHICLE
FOR RH VEHICLE
1. From ignition switch 1
2. From ignition switch 2
3. From blower fuse
4. Head light relay
5. To A / C controller6. Blower motor relay
7. Blower motor switch
8. Blower resistor
9. Blower motor
10. To ECM11. To illumination controller
(if equipped) or body ground
12. Mode control actuator
13. Mode control switch
14. From main fuse15. TAIL fuse 15 A
16. IG METER fuse 20 A
17. HEATER fuse 30 A
18. REAR DEFG fuse 15 A
19. Drive circuit
WIRING CIRCUIT

YH4
GRAND
VITARA
1A-10 HEATER AND VENTILATION
2. Screws1 2
HEATER MODE CONTROL SWITCH
REMOVAL
1) Disconnect negative (±) cable at battery.
2) If equipped with air bag system, disable air bag system.
Refer to DISABLING AIR BAG SYSTEM in Section 10B.
3) Remove meter cluster hood (1) by removing its mounting
screws (2).
4) Remove ashtray, center garnish (1) and instrument glove box
compartment.
5) Remove radio (1) (if equipped) or clock or accessory case.
6) Disconnect control cables (3) from blower motor unit (2) and
heater unit (1).

YH4
GRAND
VITARA
HEATER AND VENTILATION 1A-11
1
1. Mode control switch coupler
7) Disconnect heater blower motor switch connector (1).
8) Remove mode control switch with heater control lever assem-
bly from the removed hole in mentioned step (5).
9) Pull off heater control lever knob.
10) Remove heater mode control switch (2) with heater control
panel (3) from heater control lever assembly (1).
11) Remove heater control panel from mode control switch.
INSPECTION
Mode Control Switch

Check if continuity exists between each pair of terminals listed be-
low when mode control button is pressed.
Mode
Mode control switch terminals
VENTF ± M
BI-LEVELF ± N
HEATF ± E
DEF / HEATF ± B
DEFF ± C

With battery voltage (+) connected to terminal ªIº and (±) to termi-
nal ªFº, press each mode control button and check if indicator
lamp (3) lights.

With battery voltage (+) connected to terminal ªAº and (±) to termi-
nal ªHº, check if illumination lamp lights.

YH4
GRAND
VITARA
1A-12 HEATER AND VENTILATION
1. Temperature control lever
2. Fresh air control lever
1. Fresh air control cable 1. Heater unit
2. Control cable1
2
INSTALLATION
1) Install in reverse order of removal procedure.
2) Adjust cables as follows.
(1) Move control lever fully in arrow direction.
(2) Push heater lever fully in arrow direction and fix cable with
clamp in position as shown in left figure.
(3) Push blower lever fully in arrow direction and fix cable with
clamp in position as shown in left figure.
NOTE:
After installing control cables, be sure that control levers
move smoothly and stop at proper position.
3) If equipped with air bag, enable air bag system. Refer to ªENAB-
LING AIR BAG SYSTEMº in Section 10B.
HEATER MODE CONTROL ACTUATOR
REMOVAL
1) Disconnect negative (±) cable at battery.
2) If equipped with air bag system, disable air bag system.
Refer to DISABLING AIR BAG SYSTEM in Section 10B.
3) Remove column hole cover.

YH4
GRAND
VITARA
HEATER AND VENTILATION 1A-13
1. Lever
FOR LEFT HAND STEERING VEHICLE
FOR RIGHT HAND STEERING VEHICLE
4) Disconnect heater mode control actuator coupler (1).
5) Disconnect heater mode control actuator rod (2) from heater
unit.
6) Remove heater mode control actuator from heater unit by re-
moving its mounting screw (3).
INSPECTION
1) Connect battery voltage (+) to terminal ªb'º and (±) to terminal
ªaº.
2) Connect each terminal listed below to terminal ªa'º (negative (±)
terminal of battery) and check if lever rotation angle is as speci-
fied in figure.
MODE
TERMINAL
VENTc
BI-LEVELd
HEATe
DEF / HEATf
DEFg
INSTALLATION
1) Install in reverse order of removal procedure.
2) If equipped with air bag system, enable air bag system.
Refer to ENABLING AIR BAG SYSTEM in Section 10B.

YH4
GRAND
VITARA
1. Blower motor switch connector
1
1A-14 HEATER AND VENTILATION
HEATER CONTROL LEVER ASSEMBLY
REMOVAL
1) Disconnect negative (±) cable at battery.
2) If equipped with air bag system, disable air bag system.
Refer to DISABLING AIR BAG SYSTEM in Section 10B.
3) Remove mode control switch. Refer to item HEATER MODE
CONTROL SWITCH in this section.
INSPECTION
Check heater blower motor switch for each terminal-to-terminal
continuity. For the detail refer to WIRING CIRCUIT earlier in this
section.
EFLMLMHH
LOW
M1
M2
HIGH

YH4
GRAND
VITARA
HEATER AND VENTILATION 1A-15
1. Heater unit
2. Blower unit
3. Fresh air control cable
4. Temperature control cable
5. Heater control lever assembly
HEATER CONTROL CABLES
REMOVAL
1) Remove heater control lever assembly.
Refer to HEATER CONTROL LEVER ASSEMBLY in this sec-
tion.
2) Remove control cables (2) from control lever assembly (1).
INSTALLATION
1) Install in reverse order of removal procedure.
Refer to HEATER MODE CONTROL SWITCH in this section.
2) If equipped with air bag, enable air bag system.
Refer to ENABLING AIR BAG SYSTEM in Section 10B.