2010 Cadillac CTS Sedan AWD V6-3.6L Page 341

2010 Cadillac CTS Sedan AWD V6-3.6L Page 341

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

* 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)