Dtc B1502: Inside Air Temperature Sensor And/Or Its Circuit Malfunction - Suzuki GRAND VITARA Owner's Manual

DTC B1502: Inside Air Temperature Sensor and/or Its Circuit Malfunction

Wiring Diagram
2
[A]: HVAC control module connector "G52" (harness side view)
1. HVAC control module
DTC Detecting Condition and Trouble Area
Inside air 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.
DTC Troubleshooting
NOTE
When DTC B1503, B1511, B1512 and B1530 are indicated together, it is possible that "BLK/RED" wire
circuit open.
Step
1 Inside air temperature sensor signal circuit check
1) Disconnect inside air temperature sensor connector with
ignition switch turned OFF.
2) Check for proper connection to inside air temperature
sensor at "BLU/BLK" and "BLK/RED" wire terminals.
3) If OK, measure voltage between "BLU/BLK" wire
terminal of inside air temperature sensor connector and
vehicle body ground with ignition switch turned ON.
Is voltage 4 – 6 V?
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 "G52-20" and "G52-13" terminals.
3) If OK, measure resistance between "BLU/BLK" wire
terminal of inside air temperature sensor connector and
"G52-20" terminal of HVAC control module connector.
Is resistance below 5
3 Inside air temperature sensor signal circuit check
1) Measure resistance between "BLU/BLK" wire terminal of
inside air temperature sensor connector and vehicle
body ground.
Is resistance infinity?
1
5V
G52-20
BLU/BLK
BLK/RED G52-13
3
DTC Detecting Condition
Action
Ω
?
Air Conditioning System:
[A]
13
2. Inside air temperature sensor
3. To other sensors
• Inside air temperature sensor circuit
• Inside air temperature sensor
• HVAC control module
Yes
Go to Step 5.
Go to Step 3.
Go to Step 4.
7B-30
S5JB0A7204033
20
I5JB0A720020-01
Trouble Area
No
Go to Step 2.
"BLU/BLK" wire open or
high resistance circuit.
"BLU/BLK" wire shorted
to ground circuit.