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Home >> Chevrolet >> 2013 >> Sonic RS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 509 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1278 or B1279: Auxiliary Input Signal Circuit >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2014 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ - U0237, 4 - -
Detection Signal Circuit 4 5 5 -
Left Audio Signal Terminal 12 B1278 02, 3 3 B1278 01, 3 -
Left Audio Signal Terminal 14 3 3 3 -
Right Audio Signal Terminal 13 B1279 02, 2 2 B1279 01, 2 -
Right Audio Signal Terminal 15 2 2 2 -
Audio Common Circuit - 1, 5 - -
Ground - 4 - -
1. No or distorted audio from both sides
2. No or distorted right side audio
3. No or distorted left side audio
4. External audio inputs inoperative
5. AUX selection always available with or without device connected