Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
When a DVD is playing on the front radio display B127E will set as a false current code. Please ignore TC B127E unless the code stays current after ejecting the DVD.
To diagnose the B127E Cadillac code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The infotainment display and controls are separate components from the radio, combined into an assembly. The assembly is supplied with battery voltage and ground from the vehicle harness. The Human Machine Interface Control Module communicates digital video data for an on-screen display through a dedicated cable containing the Low Voltage Differential Signaling (LVDS) data circuits.
Control information, touch communications, and dimming level for the display are communicated via a LIN serial data circuit to the Human Machine Interface Control Module.
If the Human Machine Interface Control Module detects the display is not responding to the output on the LVDS circuits, the Human Machine Interface Control Module sets the Diagnostic Trouble Code (DTC).
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