Test Description

When performing electrical troubleshooting, refer to the appropriate TEST STEP.
These test steps apply to vehicles in which the ABS warning light and/or the VAG 1551 did not did not react to attempts at initiating the self-diagnosis. Perform test steps 1 through 59, then repeat self-diagnosis with VAG 1551.
Perform only those test steps recommended in the blink code troubleshooting charts. Perform all procedures marked with either a dot or an *.
For vehicles in which the self-diagnosis procedure gives no indication of the fault source, perform test steps 1 through 40 in sequence. Perform only those procedures in the last column marked with a dot and an *. Those steps marked with an * have already been performed.
For vehicles with self-diagnosis, perform only those test steps recommended in the blink code troubleshooting charts. Perform all procedures in last column marked with a dot* and *.
Obtain the following test equipment: test box VAG 1598, adaptor VAG 1598/10, test kit connector VAG 1594 and multimeter US 1119 or their equivalents.
Ensure that fuses S16, S21, S53 and S54, and ground wire near control unit are in satisfactory condition, and that ignition switch remains in Off position during all test steps.
Connect ABS control unit multi-pin electrical connector to VAG 1598 using adaptor. The terminal numbering on the VAG 1598 test box is identical to the numbering of the control unit. Specified test values are verified for US 1119 only, and are not necessarily applicable to other testing equipment.