Pentium B90 car vehicle instrument display authentication failure

        Troubleshooting: Use the FADS were DTC diagnostic scans, stores a "U113095-VIN code verification failed" fault codes.

        Is due to the combination meter via CAN line authentication gateway, analyze possible causes are: a combination of instruments, gateways, CAN network, signal interference. Two terminal clone vcm 2 resistance meter CAN network are located within meters and gateways, gateway to the normal vehicle replacement, the instrument cluster, the fault persists, nothing to prove that the fault with the terminating resistor. Check CAN high and CAN low two lines do not open or short circuit to each other, the two lines of Power and Ground there was no short circuit. Resistance measured between the generator L terminal and ground as 0.79kΩ, no signal interference.

       Check again after the vehicle was found off the ignition switch, the instrument also detected "vehicle authentication failure" may be judged after the ignition is switched off, there are other power supply to the instrument. Check the instrument power line, unplug the instrument found a fuse (5A), the fault disappears. After switching off the ignition fuse measuring instrument voltage 7.5V, normal should be 0, and finds that the presence of this rail link power short circuit phenomenon. Disconnect the electrical circuit diagram individually controlled device 5A fuse when unplugged Ding PMS Porsche Tester 2 control unit connector, 7.5V voltage disappears, also found "instruments authentication failure" message disappears, it is determined by internal TPMS tire pressure monitoring module short circuit caused by the failure to replace the TPMS tire pressure monitoring module troubleshooting.

       Maintenance Summary: In dealing with electrical fault, to consider relevant lines in common, especially when multiple systems share a fuse, not by virtue of a single experience or feeling blindly for parts.