With Manufacturer's Scan Tool

A/C System Signals, Checking

Special tools and equipment
- Scan Tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3
- Test box VAG 1598/31
- Hand multimeter VAG 1526 or multimeter VAG 1715
- Adapter set VAG 1594
- Wiring diagram

Test conditions
- The battery voltage must be at least 11.5 V.
- A/C functioning OK.
- No malfunctions must be stored in DTC memory, interrogating fault memory.
- Vehicle at room temperature (warmer than + 15 degree C).
- All electrical accessories, e.g. lights and rear window heating must be switched off
- A/C switched on.