CAN-Bus wiring, checking
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Release ABS Control Module connector and remove.
- Release Engine Control Module (ECM) J248 connector and remove.
- Check CAN-Bus wiring for short to one another:
- Measure resistance between test box sockets 3 + 25, (test box 1598/18):
Specification: ∞ Ω
If specification is not obtained wiring is shorted:
- Repair wiring damage using wiring diagram: → Electrical Wiring Diagrams, Troubleshooting and Component Locations
- Check DTC memory, if necessary, repair any malfunctions and erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing .
- Display readiness code → Readiness code, displaying . If DTC memory has been erased, reset readiness code → Readiness code, setting .
If specification is obtained wires are not shorted:
- Connect test box V.A.G 1598/22 (through my 1999) or test box V.A.G 1598/31 (from my 2000) to Engine Control Module (ECM) J248 wiring harness.
- Check CAN-Bus wiring between test box sockets for open circuit using wiring diagram:
- 1598/22 - 1598/18
- Socket 68 and - socket 3
- Socket 75 and - socket 25
- Wire resistance: max. 1.5 Ω
- Also, check wiring for short to battery positive (B+) or ground.
If no wiring damage is found:
- Connect test box V.A.G 1598/21 - 1 - to ABS Control Module - 2 - wiring harness.
- Check CAN-Bus wiring between the test box sockets 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