B1340

Solar Sensor. Open Circuit / Communication Fault

Fault symptoms
Perceived temperature in cabin too high or too low compared to the set temperature.

Conditions
The following conditions apply:

• Open circuit or communication error.
• The solar sensor sends an identification pulse continuously, 5V-0V-5V. The control module searches for identification pulses during time periods of 440 ms. When five successive measurements have been made with no pulse pattern, a DTC is generated.
• The diagnostic trouble code is deleted after the ignition has been switched on 20 times if the malfunction conditions have not been fulfilled.
• When the diagnostic trouble code has been generated, the control module uses a default value, that being the latest valid value. When ignition is turned on, 0 W/m 2 .

Diagnostic help
Check that a value is obtained from all 5 directions.