B146B

B146B - Channel 3 Audio Speaker Output Circuit Low






For a complete wiring diagram.

• When Monitored: With the ignition on.

• Set Condition: The amplifier detects a shorted to ground condition on the speaker output circuit.






Test Step 1 - Check for an Intermittent Condition

• Turn the ignition ON, then OFF, and then ON again.

• With the scan tool, check for amplifier DTCs.

Does the scan tool display B146B - Channel 3 Audio Speaker Output Circuit Low?

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 LF Door Speaker (+) Circuit for a Short to Ground

• Disconnect the amplifier C1 harness connector.

• Measure the resistance between ground and the speaker (+) circuit.

Is the resistance less than 10K ohms?

Yes

• Repair the short to ground in the speaker (+) circuit.

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

No

• Go to Test Step 3.

Test Step 3 - Check the LF Door Speaker (-) Circuit for a Short to Ground

• Measure the resistance between ground and the speaker (-) circuit.

Is the resistance less than 10K ohms?

Yes

• Repair the short to ground in the speaker (-) circuit.

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

No

• Go to Test Step 4.

Test Step 4 - Check Operation of the LF Door Speaker

• Turn the ignition OFF.

• Connect and install the speaker.

• Measure the resistance of the speaker circuit between the amplifier C1 harness connector and ground.

Is the resistance less than 10K ohms?

Yes

• Replace the speaker.

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

No

• Replace the amplifier.

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