Suzuki SWIFT 2005 User Manual

7B-50 Air Conditioning System: Automatic Type
DTC B1503: A/C Evaporator Air Temperature Sensor and/or Its Circuit Malfunction
S7RS0B7224011
Wiring Diagram
2 Inside air temperature sensor signal circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at “G52-6” and “G52-3” terminals.
3) If OK, measure resistance between “PNK/BLK” wire
terminal of inside air temperature sensor connector and
“G52-6” terminal of HVAC control module connector.
Is resistance below 5
Ω ?
Go to Step 3. “PNK/BLK” wire open or
high resistance circuit.
3 Inside air temperature sensor signal circuit check
1) Measure resistance between “PNK/BLK” wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance infinity?
Go to Step 4. “PNK/BLK” wire shorted
to ground circuit.
4 Inside air temperature sensor signal circuit check
1) Measure voltage between “PNK/BLK” wire terminal of
inside air temperature sensor connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
Go to Step 5. “PNK/BLK” wire shorted
to other circuit.
5 Inside air temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between “ORN” wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance below 5
Ω ?
Go to Step 7. Go to Step 6.
6 Inside air temperature sensor ground circuit check
1) Measure resistance between “G52-3” terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
Ω ?
“ORN” wire open or high
resistance circuit.
HVAC control module
faulty.
7 Inside air temperature sensor check
1) Check inside air temperature sensor referring to “Inside
Air Temperature Sensor Inspection”.
Is it in good condition?
HVAC control module
faulty.
Inside air temperature
sensor faulty.
Step Action Yes No
5V
WHT/BLK
ORN
G52-4
G52-3
2
1
3
78
12
910
65 43
1516 14 13 12 11
G52
78
910
1920
12
1112
65 43
1718 16 15 14 13
G51
I5RS0A722011-01
1. HVAC control module 2. Evaporator temperature sensor 3. To other sensors

Suzuki SWIFT 2005 Specifications

General

Brand	Suzuki
Model	SWIFT 2005
Category	Automobile
Language	English