Premium Audio System

B1400-1A- FRONT LEFT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD - PREMIUM

For a complete wiring diagram, refer to the Wiring Information.





Theory of Operation

NOTE:
There are two versions of the B1400-1A 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 B1400-1A PREMIUM test. If the vehicle is not equipped with an Amplifier use the B1400-1A BASE test.

The Left Front Audio (+) circuit and the Left Front Audio (-) circuit are outputs of the Radio. The Radio controls and monitors these circuits for a concern.

For a detailed description of the Audio System. Audio And Video - Description

For additional information regarding the operation of the Audio System. Audio And Video - Operation

- When Monitored:
With the ignition on.

- Set Condition:
The Radio detects that the output circuits are shorted together for greater than 2.5 seconds.





Diagnostic Test

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. Cycle the ignition switch from on to off, wait five seconds and then back to on.
4. Turn the Radio on and set the volume to 25.
5. Adjust the speakers to the front and center.
6. Using the scan tool, read the active Radio DTCs.

Does the scan tool display active: B1400-1A- FRONT LEFT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD - PREMIUM?

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 AMPLIFIER
1. Make sure one of the front doors is still open.
2. Using the scan tool, erase the DTCs.
3. Turn the ignition off.
4. Disconnect the Amplifier harness connector.
5. Turn the ignition on.
6. Turn the radio on and set the volume to 25.
7. Using the scan tool, read the active Radio DTCs.

Does the scan tool display active: B1400-1A- FRONT LEFT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD - PREMIUM?

Yes

- Go To 3

No

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

3. CHECK THE (X53) LEFT FRONT AUDIO (+) CIRCUIT, AND THE (X55) LEFT FRONT AUDIO (-) CIRCUITS FOR A SHORT TOGETHER
1. Disconnect the Radio harness connector.
2. Measure the resistance between the (X53) Left Front AUDIO (+) circuit, and the (X55) Left Front AUDIO (-) circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (X53) Left Front AUDIO (+) circuit, and the (X55) Left Front AUDIO (-) circuit for a short together.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

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