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Fail-Safe Table - Suzuki SX4 Service Manual

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7B-52 Air Conditioning System: Automatic Type
DTC No.
(displayed
Detection item
on SUZUKI
scan tool)
Engine Type
B1570
Signal Failure
Combination
B1571
Meter Spec
Signal Failure
NO CODE
Normal
DTC of A/C System detected by ECM
DTC No.
P0481
P0532
P0533
NOTE
When no DTC is detected, "FRE" [A] and "REC" [B] indicator lights on HVAC control module flash at
the same time in specific pattern.

Fail-Safe Table

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
Inside air temperature
B1502
sensor circuit
A/C evaporator
B1503
temperature sensor
circuit
B1504 Sunload sensor circuit
DTC (indicated on
HVAC control
module)
Indicated
Indicated
by "REC"
by "FRE"
indicator
indicator
light
light
20
4
21
4
See NOTE below
Detection item
Fan 2 Control Circuit
A/C Refrigerant Pressure
Sensor Circuit Low
A/C Refrigerant Pressure
Sensor Circuit High
[A]
[B]
H: ON
L: OFF
When ignition switch is turned ON
after malfunction is already detected
HVAC control module maintains last
normal value.
HVAC control module assuming that
evaporator temperature is 0 °C (32 °F).
HVAC control module maintains last
normal value.
Condition when trouble detected (DTC is
determined when following condition detected)
HVAC control module receives invalid data of
engine type signal from BCM.
HVAC control module receives invalid data of
combination meter spec signal from BCM.
Detecting condition
(DTC will set when detecting)
Refer to "Fail-Safe Table in Section 1A".
[A]
H
L
a
a
a
b
b
[B]
H
L
a
a
a
b
b
I5RW0A722008-01
a. About 3 seconds
b. About 1 seconds
Fail-Safe Operation
When malfunction is detected during
HVAC control module controls actuators
assuming that inside air temperature is
25 °C (77 °F).
• HVAC control module turns off A/C
switch signal.
• HVAC control module controls
actuators assuming that evaporator
temperature is 0 °C (32 °F).
HVAC control module controls actuators
assuming that amount of sunlight is 0 W/
m
2
.
"A/C"
indicator
MIL
S7RW0A7224007
ignition switch is ON
light

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