B1481

B1481-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT OPEN





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:
- Amplifier Bus wake-up. Amplifier reset with scan tool.
- Set Condition:
- The Amplifier detects an open condition on the speaker output circuit.





Diagnostic Test

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 active: B1481-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT OPEN?

Yes

- Go To 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 BODY VERIFICATION TEST VER-1. Body Verification Test

2.CHECK THE OPERATION OF THE SUBWOOFER

Disconnect the Subwoofer 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 Amplified Subwoofer 1 circuits in the Amplified Subwoofer harness connector.

Is the voltage present greater than 1 volt?

Yes

- Replace the Amplified Subwoofer.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test

No

- Go To 3

3.CHECK THE (X300) AMPLIFIED SUBWOOFER 1 (+) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Amplifier C1 harness connector.

Measure the resistance of the (X300) Amplified Subwoofer 1 (+) circuit between the Amplifier C1 harness connector and the Amplified Subwoofer harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

- Repair the (X300) Amplified Subwoofer 1 (+) circuit for an open.
- Perform BODY VERIFICATION TEST VER-1. 2242167>

4.CHECK THE (X390) AMPLIFIED SUBWOOFER 1 (-) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Amplifier C1 harness connector.

Measure the resistance of the (X390) Amplified Subwoofer 1 (-) circuit between the Amplifier C1 harness connector and the Amplified Subwoofer harness connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Amplifier.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test

No

- Repair the (X390) Amplified Subwoofer 1 (-) circuit for an open.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test