Checking a short-circuit in CAN cables

Connect an ohmmeter between respective CAN cable (CAN-L and CAN-H) and voltage supply and between the CAN cables and ground. Turn the contacts and turn the cable harness. The resistance must be infinite or very high (more than 1 MΩ).

HINT: Readings can be taken from one and the same connector if the CAN wiring, voltage supply and ground is prerouted. If possible, measure from the rear of the affected connectors in order to minimize any damage and future loose connections. If this is not possible, use the adapter wiring or loose terminal pin for good contact. 

Was a fault detected? 

• YES 

  Refer to Identifying fault causes in the CAN network 

• NO 

  Refer to Checking the traffic load on the CAN cables