Dtc B1502: Inside Air Temperature Sensor Circuit Malfunction - Suzuki SX4 Service Manual

7B-56 Air Conditioning System: Automatic Type

DTC B1502: Inside Air Temperature Sensor Circuit Malfunction

Wiring Diagram
2
[S]
PNK/BLK
ORN
3
[S]: Inside air temperature sensor signal circuit
[G]: Inside air temperature sensor ground circuit
DTC Detecting Condition and Trouble Area
Inside air temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.
DTC Troubleshooting
NOTE
When DTC B1503, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
Step
1 Was "Air Conditioning System Check" performed?
2 Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from inside air temperature
sensor and HVAC control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of inside air
temperature sensor and HVAC control module
connectors.
4) If OK, check that inside air temperature sensor circuit is
as follows.
• Wiring harness resistance of each inside air
temperature sensor signal circuit and ground circuit is
less than 3 Ω
• Insulation resistance between inside air temperature
sensor signal circuit and vehicle body ground is
infinity
• Circuit voltage of each inside air temperature sensor
signal circuit and ground circuit is 0 – 1 V with ignition
switch turned ON
Are they in good condition?
1
5V
14
G20-10
30
ORN G20-24
[G]
1. HVAC control module
2. Inside air temperature sensor
DTC Detecting Condition
Action
G20
13 12 11 10 9 8
29 28 27 26 25 24 23
Go to Step 2.
Go to Step 3.
7 6 5 4 3 2
22 21 20 19 18 17 16
3. To other sensors
Trouble Area
• Inside air temperature sensor circuit
• Inside air temperature sensor
• HVAC control module
Yes
Go to "Air Conditioning
System Check:
Automatic Type".
Inside air temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.
S7RW0A7224010
1
15
I7RW01722004-01
No