Speed signal, testing: Notes

Speed signal is required for air conditioner compressor cut-off when accelerating, for cruise control system and to improve driving comfort.

Special tools, testers and auxiliary items required 

• Scan Tool (ST) V.A.G 1551/1552 with cable V.A.G 1551/3
• Test box V.A.G 1598/22 (through my 1999)
• Test box V.A.G 1598/31 (from my 2000)
• Adapter set V.A.G 1594

• electrical tester V.A.G 1527
• Wiring diagram