A/C system signals, checking: Checking
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Connect Scan Tool V.A.G 1551/1552 → Scan Tool V.A.G 1551 , connecting .
- Start engine and let idle.
- Press - 0 - and - 1 - buttons to select address word 01: " Engine electronics".
Indicated on display:
| Rapid data transfer HELP Select function XX |
- Press buttons - 0 - and - 3 - for "Output Diagnostic Test Mode" and confirm with - Q - button.
Indicated on display:
| Rapid data transfer Q 03 Output Diagnostic Test Mode |
- Confirm input with - Q - button.
Indicated on display:
| Output Diagnostic Test Mode -> Commencement of injection valve N108 |
- Press → button.
Indicated on display:
| Output Diagnostic Test Mode -> Exhaust gas recirculation valve N18 |
- Press → button.
Indicated on display:
| Output Diagnostic Test Mode -> A/C compressor interrupt |
- A/C compressor shut-off is checked.
- A/C compressor must stop within 5 secs., (visual check) then start approx. every 5 secs. and then stop.
If A/C compressor does not switch off:
- Proceed with function 3: Output DTM, until complete.
- Press buttons - 0 - and - 6 - to select function 06: End output:.
- Press - Q - button to enter input.
- Switch off ignition.
- Remove wiper arms and cowl panel →92 WINDSHIELD WIPER & WASHER SYSTEM
- Connect test box V.A.G 1598/22 (through my 1999) or test box V.A.G 1598/31 (from my 2000) to control module wiring harness.
- Check wiring between following test box sockets and the A/C system for open circuit according to wiring diagram.
- Through MY 1999: 16
- From MY 2000: 29
Wire resistance: Max. 1.5 Ω → Electrical Wiring Diagrams, Troubleshooting and Component Locations
- Check DTC memory, if necessary, repair malfunctions.
- Erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing
- Display readiness code → Readiness code, displaying . If DTC memory has been erased, readiness code must be reset → Readiness code, setting .