CAN
Check: Outdoor temperature sensor (T27), which is connected to the coordinator or ICL2, using SDP3.Whether more fault codes affecting the yellow CAN bus have been registered. If only the affected control unit does not respond, the CAN bus is OK. The CAN bus connectors and cable harness for short circuits and open circuits. Renew the cable harness if there is damage caused by wear. Electromagnetic interference can be due to an incorrectly connected mobile telephone for example.Whether there are any fault codes in the Coordinator or ICL2.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
No temperature message or incorrect temperature message from the coordinator or ICL2.
Defective outdoor temperature sensor (T27).Unreliable CAN communication.Fault in the CAN bus.Fault in the coordinator or ICL2.