Suzuki Liana RH413, Service Manual

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7B-55 Air Conditioning System: Automatic Type
DTC B1502 (No.02): Inside Air Temperature Sensor and/or its Circuit Malfunction
S3RH0A7224012
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
4 1) With ignition switch ON position, check voltage between
“YEL/BLK” wire terminal and “BLK/RED” wire terminal at
outside air temperature sensor connector.
Is voltage about 3.5 V?
Go to Step 5. “BLK/RED” wire open,
poor connection of
“BLK/RED” wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty.
5 1) Check outside air temperature sensor referring to
“Outside Air Temperature Sensor Inspection”.
Is outside air temperature sensor normal?
HVAC control module
faulty. Outside air temperature
sensor faulty.
Step Action Yes No
5V
ORN/BLK
BLK/RED
G77-11
G77-9
2
1
3
9 11
I3RH0A722008-01
1. HVAC control module 2. Inside air temperature sensor 3. HVAC control module connector “G77” (viewed from harness side)
DTC Detecting Condition Trouble Area
• Inside air temperature signal is less than the specified (0.7 V). (Inside air
temperature is less than –15
°
C, 5
°
F.)
• Inside air temperature signal is more than the specified (3.3 V). (Inside air
temperature is more than 74
°
C, 165.2
°
F.)
• “ORN/BLK” and/or “BLK/RED” wire
faulty
• Inside air temperature sensor faulty
• HVAC control module faulty
Step Action Yes No
1 1) Turn ignition switch OFF, and then disconnect inside air
temperature sensor connector referring to “Inside Air
Temperature Sensor Removal and Installation”.
2) Turn ignition switch ON, and then check voltage
between “ORN/BLK” wire terminal at inside air
temperature sensor connector and body ground.
Is voltage about 3.5 V?
Go to Step 4. Go to Step 2.
2 1) Turn ignition switch OFF, and then disconnect HVAC
control module connector referring to “HVAC Control
Module Removal and Installation in Section 7A”.
2) Check resistance between “ORN/BLK” wire terminal at
inside air temperature sensor connector and “ORN/BLK”
wire terminal at HVAC control module connector.
Is resistance less than 1 M
Ω
?
Go to Step 3. “ORN/BLK” wire open or
high resistance.
3 1) Check resistance between “ORN/BLK” wire terminal and
body ground.
Is resistance more than 1 M
Ω
?
Poor connection of
“ORN/BLK” wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty. “ORN/BLK” wire shorted
to ground.