2010 Cadillac CTS Sedan AWD V6-3.6L Page 340
* The conditions for setting the DTC are no longer present on the auxiliary input signal circuits.
* A history DTC clears after 50 malfunction-free ignition cycles.
Diagnostic Aids
* This DTC may be stored as a history DTC without affecting the operation of the module.
* If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio System
Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the auxiliary audio jack harness connector.
2. Ignition ON, test for less than 1 volt between the left auxiliary audio signal terminal 6, to ground.
瀚慖f greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
3. Test for less than 1 volt between the right auxiliary audio signal terminal 7, to ground.
瀚慖f greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
4. Test for less than 1 volt between the auxiliary audio common signal terminal 5, to ground.
瀚慖f greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
5. Ignition OFF, test for infinite resistance from the left auxiliary audio signal terminal 6, to ground.
瀚慖f less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the radio.
6. Test for infinite resistance from the right auxiliary audio signal terminal 7, to ground.
瀚慖f less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the radio.
7. If all of the circuits test normal, replace the auxiliary audio jack.
B1279
DTC B1278 or B1279
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
