2010 Cadillac Truck SRX FWD V6-3.0L Page 439

2010 Cadillac Truck SRX FWD V6-3.0L Page 439

* signal terminal 2

瀚慖f less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the multimedia player interface

module.

4. If all of the circuits test normal, replace the auxiliary audio jack.

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) multimedia player interface module replacement, setup,

and programming

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

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1278 01

- Left Auxiliary Input Signal Circuit Short to Battery

DTC B1278 02

- Left Auxiliary Input Signal Circuit Short to Ground

DTC B1279 01

- Right Auxiliary Input Signal Circuit Short to Battery

DTC B1279 02

- Right Auxiliary Input Signal Circuit Short to Ground

Diagnostic Fault Information

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 device 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. If equipped with a multimedia player interface

module, the auxiliary inputs that would normally connect directly to the radio will have the multimedia player interface module inline of those

connections. This means that the auxiliary inputs for the radio connect to the multimedia player interface module, and the multimedia player

interface module connects to the radio, passing along the audio signals. Only the multimedia player interface module can set these DTCs.

The auxiliary audio jack has an internal mechanical detection switch that will connect the detection signal on the auxiliary audio jack to ground

when an auxiliary mini-plug is inserted.