Test Conditions

^ battery OK
^ fuse S8 OK
^ fuse S15 OK
^ speed signal OK
^ coding connector correct (check coding of connector, see Board computer code, checking)
^ voltage stabilizer OK (checking, Repair Group 90)

^ use digital multimeter Fluke 83 (US 1119), connector test kit VW 1594, Test box VAG 1598, adaptor harnesses VAG 1598/4, VAG 1598/13 and test unit VW 1301 when performing electrical checks
^ always refer to appropriate wiring diagram when troubleshooting