Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 373
7A-2 Heater and Ventilation:
Body Ventilation Construction
S6JB0A7101002
The body ventilation system of this vehicle has a fresh air intake (1) located at the cowl top panel. When fresh air
intake air selector is at FRE position (fresh), ventilating air is drawn into the interior from the cowl center garnish and
drawn out from the ventilator outlet (2) provided at each side body outer panel (both right and left side).
Additional Heater System Description (Diesel
Engine Model)
S6JB0A7101005
This system, consisting of ECM, additional heater
assembly and 3 relays, warms up the engine coolant
which flows through the heater core while the engine is
warmed up, thereby promoting interior heating. It is not
activated during pre/post heating by glow plug. Not
during pre/post heating by glow plug, it is activated on
the following conditions.
• Ten seconds have passed after the engine start.
• The battery voltage is more than 12.2 V.
• The engine speed is more than 700 rpm.
• The engine coolant and the intake air temperature is
as shown in the graph below.
2
1
2
I5JB0A710002-03
[A]: Engine coolant temperature (
°C)
[C]: ON
[B]: Intake air temperature (
°C)
[D]: OFF
0
0
5
10
10
-10
20
30
40
50
60
70
75
15
25
20
[B]
[A]
[C]
[D]
I5JB0B710001-03
Heater and Ventilation: 7A-3
On-Board Diagnostic System Description (for
Vehicle without A/C)
S6JB0A7101003
HVAC control module (for vehicle without A/C) detects
malfunction, which may occur in the following area.
When HVAC control module detects any malfunction, the
REC (recirculation) indicator lamp (4) flashes on and off
continuously after turning ignition switch to ON position.
• ECT sensor
• CMP sensor
• Wheel speed sensor
• Temperature control actuator
• Air flow control actuator
• Air intake control actuator
• Temperature selector of HVAC control module
• Blower speed selector of HVAC control module
• Serial communication line
• CAN communication line
DTC can be checked by either one of the following ways.
• DTC can be checked by using SUZUKI scan tool (2)
connected to DLC (1).
• Without using SUZUKI scan tool, DTC can be
checked by reading the flashing pattern of both the
FRE (fresh) indicator lamp (3) and the REC
(recirculation) indicator lamp (4).
• Pressing DEF (defogger) switch (5) alternates display
of current DTC and history DTC.
• DEF indicator lamp (6) remains off when display is in
current DTC and it lights up when display is in history
DTC.
HVAC Control System Description (for Vehicle without A/C)
S6JB0A7101004
For CAN communication system, refer to description on “CAN Communication System Description: For Petrol Engine
Model in Section 1A”.
When following data are sent from control modules to BCM through CAN communication, they are sent from BCM to
HVAC control module through serial communication line.
• Engine coolant temperature
• Engine Speed
• Wheel speed (Vehicle speed)
HVAC control module has a function to make initial settings of temperature control actuator, air intake actuator and air
flow actuator.
For vehicle without A/C, HVAC control module uses engine speed signal so that temperature control actuator, air
intake actuator and air flow actuator can make initial setting for door position.
Initial settings of actuators are automatically made when engine is started for the first time after battery is connected.
When initial settings are made, each actuator is forced to operate for about 15 seconds continuously.
3
4
5
6
1
2
I5JB0A710004-04
7A-4 Heater and Ventilation:
Schematic and Routing Diagram
Heater and Ventilation Wiring Circuit Diagram
S6JB0A7102001
Refer to “A/C System Wiring Circuit Diagram in Section 7B”.
Electronic Control Input / Output Diagram (for Vehicle without A/C)
S6JB0A7102002
Additional Heater System Input / Output Diagram (Diesel Engine Model)
S6JB0A7102004
Temperature selector
MODE (air flow) selector
Blower speed selector
Air intake selector
Wheel
speed
sensor
Blower motor controller
Temperature control actuator
Air flow control actuator
Air intake control actuator
BCM
ABS control module or
ESP® control module
Data link connector
Additional heater relay
(diesel engine model)
HVAC control module
CPU
ECT sensor
ECM
CMP sensor
*
*
I6JB0A710001-03
*: CAN communication
Additional heater relay No.1
Additional heater relay No.2
Additional heater relay No.3
CKP senser
IAT sencer
Battery voltage
ECT senser
ECM
I5JB0B710003-02
Heater and Ventilation: 7A-5
Component Location
Electronic Components Location for Heater (for Vehicle without A/C)
S6JB0A7103001
NOTE
The figure shows left-hand steering vehicle. For right hand steering vehicle, parts with (*) are installed
at the opposite side.
2
3
1*
4*
5*
18
6
17
19
8
15
16
10
9
14
7
11
12
13
I6JB0B710001-01
1. Air intake control actuator
8. “DEF / FOOT” switch
15. “REC” indicator lamp
2. Temperature control actuator
9. “FOOT” switch
16. “FRE” indicator lamp
3. Air flow control actuator
10. “BI-LEVEL” switch
17. MODE selector
4. Blower motor
11. “VENT” switch
18. HVAC control module (for vehicle without A/C)
5. Blower motor controller
12. Theft deterrent light
19. “DEF” indicator lamp
6. Temperature selector
13. Blower speed selector / Air intake selector
7. “DEF” switch
14. Rear defogger switch
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