Power Supply Too High
Check for overvoltage DTC in other control units. Disconnect all power lines from the infotainment system. Turn the ignition key to ON and measure the voltage between each wire to U31. The measurement result should be as follows: - Pin D18: 30 voltage to infotainment system = 12 V. - Pin D17: Earth to infotainment system = 0 V. - Pin D12: Primary Initial Signal from Start Lock = 24 V. If there is overvoltage in the 12 V supply, continue troubleshooting with the equalizer, E129, (truck 24/12 V DC converter). Only connect power, ground and CAN power grids, E7 (CAN-low) and E1 (CAN-high) pins to the electronic control unit. Connect with SDP3 to get information about any component connected to the infotainment system is short-circuited. Fix any active or inactive DTCs. Note. Before replacing the infotainment system update to the latest available software.
What you'll see
No driver-visible symptom recorded.
System reaction
System will switch off after 5 seconds above 22V
Diagnostic depth
If the battery voltage exceeds 22V. This fault will be checked in run-time. For more information, please check the Temperature & Voltage KPI document.
-Power supply voltage to the infotainment system is too high. -A component connected to the infotainment system or it's harness is short-circuited to 12 V or 24 V.