Dtc B1502 (No.02): Inside Air Temperature Sensor And/Or Its Circuit Malfunction - Suzuki Liana RH413 Service Manual

7B-55 Air Conditioning System: Automatic Type
Step
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?
5 1) Check outside air temperature sensor referring to
"Outside Air Temperature Sensor Inspection".
Is outside air temperature sensor normal?

DTC B1502 (No.02): Inside Air Temperature Sensor and/or its Circuit Malfunction

Wiring Diagram
2
1. HVAC control module
DTC Detecting Condition and 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.)
DTC Troubleshooting
Step
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?
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
3 1) Check resistance between "ORN/BLK" wire terminal and
body ground.
Is resistance more than 1 M
Action
ORN/BLK G77-11
BLK/RED G77-9
2. Inside air temperature sensor
DTC Detecting Condition
Action
Ω
?
Ω
?
Go to Step 5.
HVAC control module
faulty.
1
5V
11
3. HVAC control module connector "G77" (viewed from harness side)
Go to Step 4.
Go to Step 3.
Poor connection of
"ORN/BLK" wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty.
Yes
"BLK/RED" wire open,
poor connection of
"BLK/RED" wire
terminal at HVAC
control module
connector, and/or HVAC
control module faulty.
Outside air temperature
sensor faulty.
3
9
Trouble Area
• "ORN/BLK" and/or "BLK/RED" wire
faulty
• Inside air temperature sensor faulty
• HVAC control module faulty
Yes
Go to Step 2.
"ORN/BLK" wire open or
high resistance.
"ORN/BLK" wire shorted
to ground.
No
S3RH0A7224012
I3RH0A722008-01
No