If resistance is outside specified range:

• Remove air cleaner.

Fig 1: Releasing ABS Control Module Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Release ABS Control Module connector and remove.
• Check CAN-Bus wiring for short to one another:
• Measure resistance between test box sockets 68 + 75:

Specification: ∞ Ω

If specification is not obtained wires are shorted:

• Repair short in wiring using wiring diagram: → Electrical Wiring Diagrams, Troubleshooting and Component Locations
• Check DTC memory, if necessary, repair any malfunctions.
• Erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing 
• Display readiness code → Readiness code, displaying  . If DTC memory has been erased, readiness code must be reset → Readiness code, setting  .

If specification is obtained wires are not shorted:

Fig 2: Connecting Test Box V.A.G 1598/21 To ABS Control Module

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect test box V.A.G 1598/21 - 1  - to wiring harness for ABS Control Module J104 - 2  -.
• Check CAN-Bus wiring between test box sockets 1598/22 and 1598/21 for open circuit using wiring diagram:

• 1598/22 - 1598/21
• Socket 68 and - socket 10
• Socket 75 and - socket 11
• Wire resistance: max. 1.5 Ω

• Also, check for shorts to battery positive (B+) or Ground (GND).

If no wiring damage is found:

• Replace ABS control module. → 45 ANTI-LOCK BRAKE SYSTEM