Test K: The Climate Control Assembly Does Not Respond To The Diagnostic Tool

PINPOINT TEST K: THE CLIMATE CONTROL ASSEMBLY DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

K1-K2:

K2-K3:

Normal Operation
The dual automatic temperature control (DATC) module or electronic automatic temperature control (EATC) module both communicates with the diagnostic tool through the medium speed controller area network (CAN), circuits VDB06 (GY/OG) and VDB07 (VT/OG).

Check the medium speed CAN circuits VDB06 (GY/OG) and VDB07 (VT/OG) between the DATC module C2356a or the EATC module C228a and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the DLC C251, damage to the DATC module C2356a, EATC module C228a, or a problem in an in-line connector.

Possible Causes
- medium speed CAN data plus circuit VDB06 (GY/OG) open
- medium speed CAN data minus circuit VDB07 (VT/OG) open
- DATC module C2356a
- EATC module C228a
- DATC module
- EATC module