A/C - DTC 00445 Set/Compressor Inoperative
87 07 15Oct. 18, 2007
2015947 Supersedes T.B. Group 87 Number 07-12 dated September 6, 2007 due to addition of air conditioning coding table.
Vehicle Information
Condition
A/C Compressor Inoperative, DTC 00445 is Stored in DTC Memory
Technical Background
A/C compressor inoperative, Diagnostic Trouble Code (DTC) 00445 is stored in DTC memory. The Touareg equipped with a 4.2L V8 engine has a Refrigerant Temperature Sensor -G454- which calculates the refrigerant
level based on the temperature and pressure of the HVAC system. This sensor may be adversely affected by sudden temperature changes such as moving from a cool garage to a hot outside environment or from a hot
outside environment to a relatively cool environment such as a car wash.
Note:
The condition as described does not compromise visibility.
Production Solution
Not applicable.
Service
Switch refrigerant level detection OFF by recoding the system from 00020 to 21020 or 00030 to 21030 using the table and procedure shown.
Procedure
^ Connect VAS 5051/VAS 5052 Diagnostic Tester.
^ Select operating mode "Self Diagnosis".
^ Input address word "08 - AC/Heating electronics".
^ Select function "007 - Coding (Service 1A)".
^ Enter code number "21020" or "21030" (depending upon system) on keypad.
^ Select "Q" to confirm.
Tip:
The code entered and displayed will not be loaded into the Climatronic Control Module until the ignition has been switched OFF once.
^ Select "Back Arrow" button.
^ Select function "006 - Basic Setting".
^ Enter "01" on keypad.
^ Set basic settings.
With basic settings set:
^ Select the "Back Arrow" button.
^ Interrogate and erase any stored DTCs.
With DTCs erased:
^ Select the "Back Arrow" button.
^ End output (function 022).
^ Switch the ignition OFF then ON.
^ Select operating mode "Self Diagnosis".
^ Input address word "08" - AC/Heating electronics".
^ Interrogate and erase any stored DTCs.
With DTCs erased:
^ Select the "Back Arrow" button.
^ End output (function 022).
^ Switch ignition OFF and disconnect Data Link Connector (DLC). Data Link Connector (DLC).
Warranty
Required Parts and Tools
No Special Parts required.
No Special Tools required.
Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal. Always check with your Parts Dept. and Repair Manuals for the latest information.