Air conditioner Control Module detects ambient temperature only when vehicle is driving. To judge wheather vehicle is driving or not, Air conditioner control module receives vehicle speed signal from VDC through the CAN signal.
The Air conditioner Control Module sets DTC B1686 if vehicle speed signal has not been received through the CAN signal.
Item
Detecting Condition
DTC Strategy
Check CAN signal
Faulty wheel Speed Sensor
CAN communication
Enable Conditions
IG KEY ON
Threshold value
No signal via CAN for 1.5 seconds or receiving Error value
Failsafe
Substitued vehicle speed value as '0'