Electrical Faults

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.

When there is a fault in the signal levels on the communication wire to the central electronic module (CEM), a diagnostic trouble code (DTC) is stored in the central electronic module (CEM). Each individual communication wire to the central electronic module (CEM), CAN L and CAN H on the low speed side of the network and CAN L and CAN H on the high speed side of the network, is checked. There are two different levels detected on each wire: short-circuit to voltage or short-circuit to earth. As the central electronic module (CEM) can also determine when a short-circuit on one or more wires takes place, the control module can also detect a short-circuit between the two CAN wires in the same part of the network.

This gives eight diagnostic trouble codes for detecting electrical faults.

HINT: The central electronic module (CEM) is unable to store diagnostic trouble codes (DTCs) for open-circuits on the CAN wires. Other diagnostic trouble codes (DTCs) may, however, be stored on account of this.