Display Field No. 4
WARNING: This page is about a different car, the 2001 Volkswagen EuroVan, 2000 Volkswagen EuroVan, 1999 Volkswagen EuroVan, and 1997 Volkswagen EuroVan. However, it is still accessible from the selected car via links, so may be relevant.
Voltage supply to terminal No. 1 (Black wire) of Climatronic Control Module (CCM) 28-pin harness connector "A" should display battery voltage. Check for open or short to ground in Black wire.