B1477

B1477 - Channel 5 Audio Speaker Output Circuit Open






For a complete wiring diagram, refer to.

• When Monitored: Amplifier bus wake-up. Amplifier reset with scan tool.

• Set Condition: The amplifier detects an open condition on the speaker output circuit.






Test Step 1 - Check for an Intermittent Condition

• Turn the ignition ON.

• Turn the radio ON.

• With the scan tool, erase amplifier DTCs.

• With the scan tool, reset the amplifier.

• With the scan tool, read amplifier DTCs.

Does the scan tool display B1477 - Channel 5 Audio Speaker Output Circuit Open?

Yes

• Go to Test Step 2.

No

• The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 2 - Check the Operation of the LR Door Speaker

• Disconnect the speaker harness connector.

• Turn the radio ON and turn the volume to mid level.

• With a voltmeter set to read in A/C voltage, measure the voltage of the speaker circuits in the harness connector.

Is the voltage present greater than 1 volt?

Yes

• Replace the speaker.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Go to Test Step 3.

Test Step 3 - Check the LR Door Speaker Circuit for an Open

• Turn the ignition OFF.

• Disconnect the amplifier C1 harness connector.

• Measure the resistance of the speaker (+) circuit between the amplifier C1 harness connector and the speaker harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 4.

No

• Repair the open in the speaker (+) circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 4 - Check the LR Door Speaker (-) Circuit for an Open

• Turn the ignition OFF.

• Disconnect the amplifier C1 harness connector.

• Measure the resistance of the speaker (-) circuit between the amplifier C1 harness connector and the speaker harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Replace the amplifier.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Repair the open in the speaker (-) circuit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior