Conditions for Setting the DTC

B1277 02 

The human machine interface control module detects an short to ground in the cellular phone microphone high signal circuit.

B1277 04 

The following conditions will set this DTC:

• The human machine interface control module detects an open/high resistance in the cellular phone microphone high signal circuit.
• The human machine interface control module detects an open/high resistance in the microphone low signal circuit.