Volkswagen Workshop Service and Repair Manuals

Engine control unit receives information from gearbox control unit:
     Driving range selected (selector lever in 1/2/3/R/D)
or
     No driving range selected (selector lever in P or N)

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Test box V.A.G 1598/22
• ◆ Adapter set V.A.G 1594
• ◆ Diode test lamp V.A.G 1527
• ◆ Current flow diagram

Check conditions

• ● → Fuses 1, 2, 9 and 10 must be OK.
• ● The battery voltage must be at least 11.5 V.
• ● All electrical consumers, e.g. lights and rear window heating must be switched off.
• ● On vehicles with automatic gearbox the selector lever must be in "P" or "N" position.
• ● No faults must be stored in fault memory , interrogating and erasing fault memory.

Test sequence

• ‒ Remove wiper arms and cowl panel:

=> Electrical system; Repair group 92; windscreen wiper system; removing and installing windscreen wiper system

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.
• ‒ Connect diode test lamp between socket 1 (terminal 30) and socket 22.
• ‒ Switch on ignition.
• ‒ The diode test lamp should go out when a gear is engaged.
• ‒ Switch off ignition.
• ‒ If the diode test lamp is permanently lit or does not light up at all, check the wiring from contact 22 on engine control unit to automatic gearbox for short to positive and to earth as well as for open circuit:

=> Current flow diagrams, Electrical fault finding and Fitting locations