2010 Cadillac CTS Sedan AWD V6-3.6L Page 339
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Preform the appropriate radio programming or setup as directed in Control Module References (See: Testing and Inspection/Programming and
Relearning).
If the DTC resets, replace the radio.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for radio replacement, setup, and programming.
B1278
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
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1278 01
- Auxiliary Input 1 Signal Circuit Short to Battery
DTC B1278 02
- Auxiliary Input 1 Signal Circuit Short to Ground
DTC B1279 01
- Auxiliary Input 2 Signal Circuit Short to Battery
DTC B1279 02
- Auxiliary Input 2 Signal Circuit Short to Ground
Circuit/System Description
A remote 3.5 mm auxiliary stereo jack allows playback of audio signals from remote devices (e.g., laptop computer, IPOD, MP3 player, etc.).
When a remote devices audio mini-plug is inserted in the remote auxiliary jack, an internal mechanical switch closes completing the aux jack detect
circuit to the radio. The radio automatically detects the input through the circuit and the device begins playing. The radio receives the devices audio
signals on the auxiliary input 1 (left) signal circuit and auxiliary input 2 (right) signal circuit.
Conditions for Running the DTC
The following are conditions that must be present in order for the radio to enable diagnostics:
* The ignition must be in the RUN or ACC position.
* The system voltage is at least 9.5 volts and no more than 15.5 volts.
Conditions for Setting the DTC
* The radio detects a short to battery on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
* The radio detects a short to ground on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
* All the above conditions are present for greater than 250 mS.
Action Taken When the DTC Sets
No audio is heard from the remote audio device.
Conditions for Clearing the DTC
