B1065
DTC B1025, B1035, B1045, or B1055
Diagnostic Instructions
* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provide an overview of each diagnostic category.
DTC Descriptors
DTC B1025 01
- Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02
- Audio Output 1 Left Front Circuit Short to Ground
DTC B1025 04
- Audio Output 1 Left Front Circuit Open
DTC B1035 01
- Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02
- Audio Output 2 Right Front Circuit Short to Ground
DTC B1035 04
- Audio Output 2 Right Front Circuit Open
DTC B1045 01
- Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02
- Audio Output 3 Left Rear Circuit Short to Ground
DTC B1045 04
- Audio Output 3 Left Rear Circuit Open
DTC B1055 01
- Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02
- Audio Output 4 Right Rear Circuit Short to Ground
DTC B1055 04
- Audio Output 4 Right Rear Circuit Open
DTC B1065 01
- Audio Output 5 Front Center Circuit Short to Battery
DTC B1065 02
- Audio Output 5 Front Center Circuit Short to Ground
DTC B1065 04
- Audio Output 5 Front Center Circuit Open
DTC B1075 01
- Audio Output 6 Rear Subwoofer Circuit Short to Battery
DTC B1075 02
- Audio Output 6 Rear Subwoofer Circuit Short to Ground
DTC B1075 04
- Audio Output 6 Rear Subwoofer Circuit Open
Diagnostic Fault Information
Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the radio and at the amplifier (if equipped) have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. 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. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher. In an amplified audio system, these similar AC voltage measurements may be slightly higher on the output of the amplifier, and the typical AC voltage readings at the output of the radio are less than 1V AC .
Conditions for Running the DTC
The radio is ON.
Conditions for Setting the DTC
DTC set in Radio
The radio detects a short to voltage, short to ground, or an open on any of the audio outputs.
DTC set in Amplifier
The DTC will not set during amplifier operation. The vehicle must have the ignition OFF and the fault must be present during amplifier power-up.
Action Taken When the DTC Sets
The radio disables audio output on the appropriate channel
Conditions for Clearing the DTC
DTC set in Radio
The fault condition becomes history if not present for 0.25 seconds.
DTC set in Amplifier
The fault condition becomes history after the vehicle ignition has been OFF for several hours and then the ignition turns ON.
Diagnostic Aids
Speakers located in the front A-pillar are connected to the same channel as the speaker in the door. A DTC will only set by the amplifier on up-level radios.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (Radio/Navigation System Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Radio ON, adjust the fade and balance controls on the radio and listed to each of the four audio channels individually. Each of the four channels should produce clear and even sound.
Circuit/System Testing
Without Amplifier
1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
3. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
4. If all circuits test normal, test or replace the speaker.
With Amplifier - DTC Set in Radio
1. Ignition OFF, disconnect the X3 harness connector at the amplifier.
2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground:
* Left front low audio signal (+) - terminal 5
* Left front low audio signal (-) - terminal 13
* Right front low audio signal (+) - terminal 6
* Right front low audio signal (-) - terminal 14
* Left rear low audio signal (+) - terminal 7
* Left rear low audio signal (-) - terminal 15
* Right rear low audio signal (+) - terminal 8
* Right rear low audio signal (-) - terminal 16
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
3. If all circuits test normal, replace the amplifier.
With Amplifier - DTC Set in Amplifier
1. Ignition OFF, disconnect the X1 and X2 harness connectors at the amplifier.
2. Ignition ON, test for less than 1 volt between each of the signal circuit terminals listed below and ground:
* Left Front Speaker Output(+) - terminal 1 X2
* Left Front Speaker Output (-) - terminal 9 X2
* Right Front Speaker Output(+) - terminal 2 X2
* Right Front Speaker Output (-) - terminal 10 X2
* Left Rear Speaker Output (+) - terminal 3 X2
* Left Rear Speaker Output (-) - terminal 11 X2
* Right Rear Speaker Output (+) - terminal 4 X2
* Right Rear Speaker Output (-) - terminal 12 X2
* Front Center Speaker Output (+) - terminal 5 X2
* Front Center Speaker Output(-) - terminal 13 X2
* Left or Rear Subwoofer Output (+) - terminal 3 X1
* Left or Rear Subwoofer Output (-) - terminal 7 X1
* Right Subwoofer Output (+) - terminal 4 X1
* Right Subwoofer Output (-) - terminal 8 X1
• If greater than the specified range, test both signal circuits of the affected speaker for a short to voltage.
3. Ignition OFF, test for infinite resistance between each of the signal circuit terminals listed below and ground.
* Left Front Speaker Output(+) - terminal 1 X2
* Left Front Speaker Output (-) - terminal 9 X2
* Right Front Speaker Output(+) - terminal 2 X2
* Right Front Speaker Output (-) - terminal 10 X2
* Left Rear Speaker Output (+) - terminal 3 X2
* Left Rear Speaker Output (-) - terminal 11 X2
* Right Rear Speaker Output (+) - terminal 4 X2
* Right Rear Speaker Output (-) - terminal 12 X2
* Front Center Speaker Output (+) - terminal 5 X2
* Front Center Speaker Output(-) - terminal 13 X2
* Left or Rear Subwoofer Output (+) - terminal 3 X1
* Left or Rear Subwoofer Output (-) - terminal 7 X1
* Right Subwoofer Output (+) - terminal 4 X1
* Right Subwoofer Output (-) - terminal 8 X1
• If not than the specified value, test both signal circuits of the affected speaker for a short to ground.
4. Ignition OFF, reconnect the X1 and X2 harness connectors at the amplifier. Disconnect the harness connector at the appropriate speaker.
5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminals listed below and ground.
* Front center speaker (+) - terminal B
* Front center speaker (-) - terminal A
* Front door speaker (+) - terminal B
* Front door speaker (-) - terminal A
* Front tweeter (+) - terminal B
* Front tweeter (-) - terminal A
* Rear door speaker (+) - terminal B
* Rear door speaker (-) - terminal A
* Rear tweeter (+) - terminal B
* Rear tweeter (-) - terminal A
* Rear subwoofer (+) - terminal B
* Rear subwoofer (+) - terminal D
* Rear subwoofer (-) - terminal A
* Rear subwoofer (-) - terminal C
• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
6. If all circuits test normal, test or replace the speaker.
Repair Instructions
Perform theDiagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Speaker Replacement Reference (Speaker Replacement Reference)
* Control Module References (Programming and Relearning) for radio or amplifier replacement, setup, and programming