Base

B140B-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT OPEN - BASE






NOTE: There are two versions of the B140B DTC test. In order to select the proper test you must know if the vehicle is equipped with an Amplifier. If the vehicle is equipped with an Amplifier use the B140B-PREMIUM test. If the vehicle is not equipped with an Amplifier use the B140B-BASE test.

Theory of Operation

The (X303) Left Rear Speaker (+) circuit and the (X393) Left Rear Speaker (-) circuit are outputs of the Radio. The Radio controls and monitors these circuits for a concern.

- When Monitored:
With the Radio on.

- Set Condition:
The Radio detects an open condition on the speaker output circuit.





1. CHECK FOR AN INTERMITTENT CONDITION
1. Turn the ignition on and open one of the front doors.

NOTE: A front door must remain open whenever checking or erasing Radio DTCs.

2. Using the scan tool, record and erase the Radio DTCs.
3. Turn the Radio on.
4. Adjust the speakers to the rear and center.
5. Using the scan tool, read the active Radio DTCs.

Does the scan tool read: B140B-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT OPEN?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE LEFT REAR SPEAKER




1. Turn the ignition off.
2. Disconnect the Left Rear Speaker harness connector.
3. Measure the resistance of the speaker between the two terminals.

NOTE: The graphic shows the connector for reference only. Measure between the speaker terminals.

Is the resistance above 5.0 Ohms?

Yes

- Replace the Left Rear Speaker.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE (X303) LEFT REAR SPEAKER (+) CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Disconnect the Radio harness connector.
3. Measure the resistance of (X303) Left Rear Speaker (+) circuit between the Radio connector, and the Left Rear Speaker harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair open in the (X303) Left Rear Speaker (+) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (X393) LEFT REAR SPEAKER (-) CIRCUIT FOR AN OPEN




1. Measure the resistance of (X393) Left Rear Speaker (-) circuit between the Radio connector, and the Left Rear Speaker harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Radio.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair open in the (X393) Left Rear Speaker (-) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.