Work sequence

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Switch off ignition.
Remove windshield wiper arms and cover for plenum chamber: → Electrical Equipment - Repair Group 92.
Unlock and separate connector on engine control module.

Fig 1: Identifying Special Tool V.A.G 1598/31

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Connect test box V.A.G 1598/31 to control module wiring harness.
Check wiring for open circuit between test box socket 27 and instrument cluster for open or short circuit referring to wiring diagram. Wire resistance: max. 1.5 Ω Electrical Wiring Diagrams, Troubleshooting Component Locations