B1745

Outside temperature sensor

Fault symptom
B1745: Outside temperature not displayed

B1746: Diagnostic trouble code l ACC:
Outside temperature sensor open/short circuit

Action
1 Unplug the temperature sensor connector. Check the resistance in the outside temperature sensor with the connector unplugged. The resistance varies with temperature, see table.

If the value is incorrect, change the sensor.
2 Check the leads by measuring the voltage at pin 1 on the connector (5 V). If there is no voltage, check pin 35 on the control module with the connector plugged in.

If there is no voltage, proceed to "Action Before Changing A Control Module".

If there is voltage, unplug the 39 pin connector and check the lead between pins 35 and 1 on the sensor for open circuit. Localize and remedy the fault
3 Check the lead between pin 28 on the control module and pin 2 in the connector for open circuit.

Resistance at 0° C ( 32° F) kOhms 5,8 - 6,2
10° C ( 50° F) kOhms 3,8 - 4,1
20° C ( 68° F) kOhms 2,5 - 2,8
30° C ( 86° F) kOhms 1,7 - 1,9
40° C (104° F) kOhms 1,2 - 1,4

4 If there is no fault in the lead, proceed to "Action Before Changing A Control Module".