Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Front Speaker Signal (+) | B1025 02 | B1025 04 | B1025 03 | -- |
Left Front Speaker Signal (-) | B1025 02 | B1025 04 | B1025 03 | -- |
Right Front Speaker Signal (+) | B1035 02 | B1035 04 | B1035 03 | -- |
Right Front Speaker Signal (-) | B1035 02 | B1035 04 | B1035 03 | -- |
Left Rear Speaker Signal (+) | B1045 02 | B1045 04 | B1045 03 | -- |
Left Rear Speaker Signal (-) | B1045 02 | B1045 04 | B1045 03 | -- |
Right Rear Speaker Signal (+) | B1055 02 | B1055 04 | B1055 03 | -- |
Right Rear Speaker Signal (-) | B1055 02 | B1055 04 | B1055 03 | -- |
Center Speaker Signal (+) | B1065 02 | 1 | 1 | -- |
Center Speaker Signal (-) | B1065 02 | 1 | 1 | -- |
1. Speaker malfunction | ||||
Circuit/System Description
Each of the audio signal channel circuit (+ and -) has 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 AC voltage will vary depending on what type of audio is being listened to, as well as the volume setting of the system.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Radio ON, adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and even sound.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate speaker.
- Radio ON, test for 2.5-7.5 volts between the signal circuit terminal 1 and ground.
- Test for 2.5-7.5 volts between the signal circuit terminal 2 (door speaker) or terminal 4 (center speaker) and ground.
- If all circuits test normal, test or replace the speaker.
| ⇒ | 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. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for radio replacement, setup, and programming |
