2010 Cadillac CTS Sedan AWD V6-3.6L Page 316
Circuit/System Description
Each of the audio output channel circuits (+) and (-) have a varying AC mV signal that is produced by the radio and sent to the amplifier. The
amplifier then processes these signals and passes the audio along with a DC bias voltage to the appropriate speakers. The audio being played on the
system is produced by the varying AC voltage. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary
depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. When using a
DMM, each of the audio amplifier output channel circuits will measure approximately 6.5V DC.
Conditions for Running the DTC
* The ignition is in the RUN or ACC position.
* The system voltage is at least 9.5 volts and no more than 15.5 volts.
* All the above conditions are present for greater than 10 seconds.
Conditions for Setting the DTC
B1025 01, B1035 01, B1045 01, B1055 01, B1065 01, B1075 01, B1085 01, B1095 01, B1105 01, B1115 01
The amplifier detects a short to voltage on the audio (+) or audio (-) circuit.
B1025 02, B1035 02, B1045 02, B1055 02, B1065 02, B1075 02, B1085 02, B1095 02, B1105 02, B1115 02
The amplifier detects a short to ground on the audio (+) or audio (-) circuit.
B1025 04, B1035 04, B1045 04, B1055 04, B1065 04, B1085 04, B1095 04, B1105 04, B1115 04
The amplifier detects an open on the audio (+) or audio (-) circuit.
Action Taken When the DTC Sets
The amplifier disables the audio output to the speaker with the current fault.
Conditions for Clearing the DTC
* A current DTC clears when the conditions for setting the DTC are no longer present and the ignition has been cycled from OFF to ON.
* A history DTC clears after 50 malfunction-free ignition cycles.
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)
