A system for providing access to diagnostic information stored on an electronic device comprising: a power source; a power management unit coupled to the power source and configured to distribute power from the power source to one or more other components of the electronic device; a power source monitoring device coupled to the power source and configured to determine diagnostic information relating to the power source; characterised in that the system comprises: abuse detection circuitry configured to receive the diagnostic information determined by the power source monitoring device; and an interface configured to facilitate communication between the electronic device and an external device (44, 46), wherein if the external device (44, 46) is a diagnostic device and the power source is non-operational, the diagnostic device is configured to provide power to the power source monitoring device and the power management unit via the interface, wherein the interface comprises at least a first data line and a second data line, wherein the interface is further configured to provide power via the first data line and provide a single-wire bidirectional communication path via the second data line if the power source is non-operational, and wherein the interface is configured to provide an upstream communication path via the first data line and provide a downstream communication path via the second data line otherwise. a power source; a power management unit coupled to the power source and configured to distribute power from the power source to one or more other components of the electronic device; a power source monitoring device coupled to the power source and configured to determine diagnostic information relating to the power source; characterised in that the system comprises: abuse detection circuitry configured to receive the diagnostic information determined by the power source monitoring device; and an interface configured to facilitate communication between the electronic device and an external device (44, 46), wherein if the external device (44, 46) is a diagnostic device and the power source is non-operational, the diagnostic device is configured to provide power to the power source monitoring device and the power management unit via the interface, wherein the interface comprises at least a first data line and a second data line, wherein the interface is further configured to provide power via the first data line and provide a single-wire bidirectional communication path via the second data line if the power source is non-operational, and wherein the interface is configured to provide an upstream communication path via the first data line and provide a downstream communication path via the second data line otherwise. abuse detection circuitry configured to receive the diagnostic information determined by the power source monitoring device; and an interface configured to facilitate communication between the electronic device and an external device (44, 46), wherein if the external device (44, 46) is a diagnostic device and the power source is non-operational, the diagnostic device is configured to provide power to the power source monitoring device and the power management unit via the interface, wherein the interface comprises at least a first data line and a second data line, wherein the interface is further configured to provide power via the first data line and provide a single-wire bidirectional communication path via the second data line if the power source is non-operational, and wherein the interface is configured to provide an upstream communication path via the first data line and provide a downstream communication path via the second data line otherwise.