Dtc B1503: A/C Evaporator Air Temperature Sensor And/Or Its Circuit Malfunction - Suzuki Grand Vitara 2011 Manual

7B-37 Air Conditioning System:
Step
4 Inside air temperature sensor signal circuit check
1) Measure voltage between "BLU/BLK" wire terminal of
inside air temperature sensor connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
5 Inside air temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between "BLK/RED" wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance below 5
6 Inside air temperature sensor ground circuit check
1) Measure resistance between "G52-13" terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
7 Inside air temperature sensor check
1) Check inside air temperature sensor referring to "Inside
Air Temperature Sensor Inspection".
Is it in good condition?

DTC B1503: A/C Evaporator Air Temperature Sensor and/or Its Circuit Malfunction

Wiring Diagram
2
WHT/BLK
BLK/RED
[A]: HVAC control module connector "G52" (harness side view)
1. HVAC control module
DTC Detecting Condition and Trouble Area
Evaporator temperature sensor signal voltage is more than or less than
specified value for specified time continuously.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.
Action
Ω
?
Ω
?
1
5V
G52-19
G52-13
3
DTC Detecting Condition
Yes
Go to Step 5.
Go to Step 7.
"BLK/RED" wire open or
high resistance circuit.
HVAC control module
faulty.
[A]
13
2. Evaporator temperature sensor
3. To other sensors
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
No
"BLU/BLK" wire shorted
to other circuit.
Go to Step 6.
HVAC control module
faulty.
Inside air temperature
sensor faulty.
S6JB0A7204013
19
I5JB0A720021-01
Trouble Area