Suzuki 2006 SX4, Service Manual

Page: 919 / 1478

Air Conditioning System: Automatic Type 7B-54
Fail-Safe Table
S6RW0C7224007
When any of the following malfunctions (DTCs) is detected, fail-safe mode is activated.
However, when HVAC control module detects normal operation of A/C system, fail-safe mode is canceled.
DTC No. Trouble Area
Fail-Safe Operation
When ignition switch is turned ON
after malfunction is already detected
When malfunction is detected during
ignition switch is ON
) B1502
Inside air temperature
sensor circuit HVAC control module maintains last
normal value.
HVAC control module controls actuators
assuming that inside air temperature is
25
°
C (77
°
F).
) B1503
A/C evaporator
temperature sensor
circuit
HVAC control module assuming that
evaporator temperature is 0
°
C (32
°
F).
• HVAC control module turns off A/C
switch signal.
• HVAC control module controls
actuators assuming that evaporator
temperature is 0
°
C (32
°
F).
) B1504 Sunload sensor circuit
HVAC control module maintains last
normal value.
HVAC control module controls actuators
assuming that amount of sunlight is 0 W/
m
2 .
) B1520
Temperature selector
malfunction HVAC control module maintains last
normal value.
HVAC control module controls actuators
assuming that setting of temperature
selector is 25
°
C (77
°
F) position.
) B1521
Blower speed selector
malfunction HVAC control module maintains last
normal value.
HVAC control module controls actuators
assuming that setting of blower speed
selector is low (1st) position.
) B1522
Air flow selector
malfunction HVAC control module maintains last
normal value.
HVAC control module controls actuators
assuming that setting of air flow selector
is DEF position.
) B1551
Serial communication
circuit • HVAC control module maintains last
normal value of outside air
temperature.
4 seconds after, HVAC control
module assuming that outside air
temperature is 20
°
C (68
°
F).
• HVAC control module maintains last
normal value of engine coolant
temperature.
4 seconds after, HVAC control
module assuming that engine
coolant temperature is 80
°
C (176
°
F).
• HVAC control module controls
actuators assuming that vehicle
speed is 40 km/h (25 mph).
• HVAC control module controls
actuators assuming that engine type
signal is J20.
• HVAC control module controls
actuators assuming that
combination meter spec signal is
US.
HVAC control module controls actuators
assuming that outside air temperature is
20
°
C (68
°
F), engine coolant
temperature is 80
°
C (176
°
F), vehicle
speed is 40 km/h (25 mph), engine type
signal is J20 and combination meter spec
signal is US.
) B1552
HVAC control module
check sum error
) B1553
CAN communication
circuit
)
B1557 VSS signal failure
HVAC control module controls actuators assuming that vehicle speed is 40 km/h
(25 mph).
)
B1561 ECT signal failure
HVAC control module maintains last
normal value of engine coolant
temperature. 4 seconds after, HVAC
control module assuming that engine
coolant temperature is 80
°
C (176
°
F).
HVAC control module controls actuators
assuming that engine
coolant temperature is 80
°
C (176
°
F).