B1025
DTC B1025, B1035, B1045, or B1055
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides 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 B1025 0E
-
Audio Output 1 Left Front Circuit Resistance below Threshold
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 B1035 0E
-
Audio Output 2 Right Front Circuit Resistance below Threshold
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 B1045 0E
-
Audio Output 3 Left Rear Circuit Resistance below Threshold
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 B1055 0E
-
Audio Output 4 Right Rear Circuit Resistance below Threshold
Diagnostic Fault Information
Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V 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. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.
Conditions for Running the DTC
* Ignition is ON or in the ACC position
* The system voltage is 9-16 V
* The test is run once during radio wake up
Conditions for Setting the DTC
B1025 01, B1035 01, B1045 01, B1055 01
A short to voltage is detected on the specified speaker (+) or (-) signal circuit.
B1025 02, B1035 02, B1045 02, B1055 02
A short to ground is detected on the specified speaker (+) or (-) signal circuit.
B1025 04, B1035 04, B1045 04, B1055 04
An open/high resistance is detected on the specified speaker (+) or (-) signal circuit.
B1025 0E, B1035 0E, B1045 0E, B1055 0E
A lower resistance than expected is detected between the specified speaker signal circuits.
Action Taken When the DTC Sets
* The radio shuts down the affected output circuit.
* No sound may be present from one or more speakers.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Radio/Audio System Description and Operation Radio/Audio System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
B1025, B1035, B1045, or B1055 with symptom byte 01, 02 or 04
1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
2. Radio ON, test for 5.0-7.5 V between the appropriate speaker signal circuit listed below and ground.
* Door speaker terminal A
* Tweeter speaker terminal 2
• 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.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
3. Test for 5.0-7.5 V between the appropriate speaker signal circuit listed below and ground.
* Door speaker terminal B
* Tweeter speaker terminal 1
• 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.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
4. If all circuits test normal, replace the speaker.
B1025 or B1035 with symptom byte 0E
1. Ignition OFF, disconnect the harness connector of both the door and tweeter speaker on the appropriate audio channel.
2. Ignition ON, radio ON, verify DTC B1025 0E or B1035 0E is NOT set as current.
• If either DTC B1025 0E or B1035 0E is set as current, test both circuits of the affected audio channel for a shorted together condition. If the circuits test normal, replace the radio.
3. Ignition OFF, reconnect the tweeter speaker on the affected audio channel.
4. Ignition ON, radio ON, verify DTC B1025 0E or B1035 0E is NOT set as current.
• If either DTC B1025 0E or B1035 0E is set as current, replace the appropriate tweeter speaker.
5. If all circuits test normal, replace the appropriate door speaker.
B1045 or B1055 with symptom byte 0E
1. Ignition OFF, disconnect the harness connector of the appropriate speaker.
2. Ignition ON, radio ON, verify DTC B1045 0E or B1055 0E is NOT set as current.
• If either DTC B1045 0E or B1055 0E is set as current, test both circuits of the affected audio channel for a shorted together condition. If the circuits test normal, replace the radio.
3. If all circuits test normal, replace the appropriate door speaker.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Speaker Replacement Reference Speaker Replacement Reference
* Control Module References Control Module References for audio amplifier and radio replacement, setup, and programming