B1348

Blended air temperature sensor, open/short circuit to-BPV.

Action
1 Connect the ISAT scan tool and read "MIXED AIR SENSOR".
When the engine is running and the selected cabin temperature is changed, the value on the ISAT scan tool display should also change. The car engine must be warm.
2 Remove the Automatic Climate Control (ACC) control module and unplug the connector.
3 Connect a BOB and measure the resistance between pins 14 and 32 in the ACC control module connector.
The resistance should vary with the temperature of the surrounding air according to the following table.
If the value is incorrect, unplug blended air temperature sensor connector H10-4, connect a BOB to the ACC control module and measure the voltage between pin 32 and pin 1 on the ACC control module. The voltage should be about 11 V.
In the case of an incorrect value, proceed to "Action Before Changing A Control Module". Before Changing a Control Module

°C (°F) Min. (k Ohms Max. (k Ohms)
0 (32) 25.5 30.5
+19 (50) 16.8 19.7
+20 (6S) 11.3 13.0
+30 (86) 7.8 8.8
+40 (104) 5.4 6.1







4 Measure the voltage between pins 9 and 10 in connector H10-4. The voltage should be about 11 V. If the value is correct, change the sensor.
5 Check the wiring harness for open/short circuits as follows:
- Pin 32 on the ACC control module to pin 10 in connector H10-4.
- Pin 14 on the ACC control module to pin 9 in connector H104.
6 If the fault remains, proceed to "Action Before Changing A Control Module". Before Changing a Control Module