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Home >> Pontiac >> 2009 >> G8 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC U2121 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.

The radio continuously sends a communication signal to the driver information display. Upon receiving the signal, the display sends a reply signal, confirming that it can communicate. The display is directly connects to the radio with no external circuits involved.

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