DTC B127E

Diagnostic Instructions

DTC Descriptor

DTC B127E 00

Front Video Display Output Signal – General failure

DTC B127E 06

Front Video Display Output Signal – Short to ground or open

Circuit/System Description

The infotainment display and controls are a separate component from the radio, combined into an assembly. The assembly is supplied battery voltage and ground from the vehicle harness. The radio communicates digital video data for on-screen display through a dedicated cable containing the LVDS data circuits.

Control information, touch communications and dimming level for the display are communicated via a LIN serial data circuit to the radio.

If the radio detects the display is not responding to the output on the LVDS circuits, the radio sets the DTC.

Diagnostic Aids

Malfunctions may include a flickering or distorted image or a blank screen.

A momentary spike in volume upon start up may be due to the radio accessing the guest profile before switching to an established customer user profile. The radio will remember the set volume level the last time it was shut down in the guest profile mode, which is a normal operating characteristic. To alleviate the issues turn the radio on and proceed to the guest profile. Turn the volume level down to a lower level and power down the vehicle, the radio will retain the lower volume level upon the next start up.

Conditions for Running the DTC

  • Ignition is ON or in the ACC position
  • The system voltage is 9-16 V
  • The infotainment system is ON
  • The test is continuously when the infotainment system is operating

Conditions for Setting the DTC

The radio detects the display is not responding to the output on the LVDS circuits.

Action Taken When the DTC Sets

  • The radio sets this DTC
  • No images are shown on the Info Display Module

Conditions for Clearing the DTC

  • The radio detects a properly synced digital video signal.
  • A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Radio/Audio System Description and Operation

Electrical Information ReferenceScan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Circuit/System Testing

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.