DTC B1025-B1135 (IOR)
DTC Descriptor
DTC B1025

Left Front Audio Output Circuit

DTC B1035

Right Front Audio Output Circuit

DTC B1045

Left Rear Audio Output Circuit

DTC B1055

Right Rear Audio Output Circuit

Symptom Byte Information:Symptom Byte List

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

High Input

High Temperature

Signal Performance

Signal—P19 Speaker—Left Front

B1025 02, 1

B1025 04, 1

B1025 01, 1, 2

B1025 11, 1

B1025 54, 1

—

Signal—P19 Speaker—Right Front

B1035 02, 1

B1035 04, 1

B1035 01, 1, 2

B1035 11, 1

B1035 54, 1

—

Signal—P19 Speaker—Left Rear

B1045 02, 1

B1045 04, 1

B1045 01, 1, 2

B1045 11, 1

B1045 54, 1

—

Signal—P19 Speaker—Right Rear

B1055 02, 1

B1055 04, 1

B1055 01, 1, 2

B1055 11, 1

B1055 54, 1

—

  1. P19 Speaker»Inoperative
  2. P19 Speaker»Poor Quality
Circuit/System Description

Circuit

Description

Signal

The control module input circuit has an internal resistance connected to ground.

Component

Description

A11 Radio

The radio is used for entertainment and may contain other functions like navigation.

P19 Speaker

An electroacoustic transducer which converts an electrical audio signal into a corresponding sound.

Conditions for Running the DTC

A11 Radio=On

Conditions for Setting the DTC

B1025 01, B1035 01, B1045 01, B1055 01

Signal circuit=Short to Battery

B1025 02, B1035 02, B1045 02, B1055 02

Signal circuit=Short to Ground

B1025 04, B1035 04, B1045 04, B1055 04

Signal circuit=Open/High Resistance

B1025 11, B1035 11, B1045 11, B1055 11

Signal circuit=High Input

B1025 54, B1035 54, B1045 54, B1055 54

Signal circuit=High Temperature

Actions Taken When the DTC Sets

P19 Speaker=Inoperative

Conditions for Clearing the DTC

The conditions for setting the DTC no longer exist.

Diagnostic Aids

  • Improper speaker mounting, loose trim, or loose connector to the speaker may cause an audible buzz or distortion. Inspect the appropriate speaker, the surrounding interior trim, and the connector for proper connection and secure mounting.
  • The EL-50334-6 Audio System Diagnostic CD contains audio tracks that can be used to duplicate and isolate concerns. Tracks 11 and 12 contain audio sweep tones for testing for speaker and grill rattles. The test tones on the CD may be copied to a USB drive or other device to use during testing.
  • Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.
Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Radio/Audio System Description and Operation

Electrical Information ReferenceCircuit/System Verification
  1. Ignition » On / Vehicle » In Service Mode
  2. A11 Radio»On
  3. Mute»Off

    4. Note: The balance and fade controls can be used to help isolate an inoperative speaker or poor sound condition.

  4. Verify the component works as specified:P19 Speaker—All=Clear sound
    • If the component does not work as specified

      Refer to: Circuit/System Testing

    • If the component works as specified
  5. All OK.
Circuit/System Testing

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the appropriate electrical connector:P19 Speaker
  3. Ignition » On / Vehicle » In Service Mode
  4. A11 Radio»On
  5. Mute»Off
  6. Test for 2 to 10 V between the test points:
    • Signal circuit terminal 1&Ground
    • Signal circuit terminal 2&Ground
    • If less than 2 V
    1. Ignition/Vehicle » Off
    2. Disconnect the appropriate electrical connector:A11 Radio
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 1@P19 Speaker&Ground
      • Signal circuit terminal 2@P19 Speaker&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:
      • Signal circuit terminal 1@P19 Speaker&The other end of the circuit@A11 Radio
      • Signal circuit terminal 2@P19 Speaker&The other end of the circuit@A11 Radio
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:A11 Radio
    • If greater than 10 V
    1. Ignition/Vehicle » Off
    2. Disconnect the appropriate electrical connector:A11 Radio
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:
      • Signal circuit terminal 1@P19 Speaker&Ground
      • Signal circuit terminal 2@P19 Speaker&Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:A11 Radio
    • If between 2 and 10 V
  7. Test or replace the component:P19 Speaker
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification