Open-circuit, intermittent faults
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
An open-circuit in a cable will be indicated by the loss of a function (or functions).
Chafed and broken leads are common causes of faults.
Checks:
- Disconnect the connectors at both ends of the cable.
Check the cables visually according to Inspect terminals visually .
Connect an ohmmeter between the ends of the cable.
The ohmmeter should read approximately 0Ω if there is no open-circuit in the cable.
Shake the cable lightly and pull on connectors during measurement to locate the damage.
If the reading is not correct. Replace the cable and / or continue according to Contact resistance and oxidation .
Always check the control module and control module box connectors to ensure that their pins and sockets are not bent or damaged, this may cause faults.
Check pins and terminals particularly carefully.