Amplifier (AMP)

B2199-16-BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD

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

Theory of Operation

The Amplifier monitors the input circuit voltage. The Amplifier sets a DTC if the input circuit voltage drops below a certain voltage.

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 Amplifier monitors the input voltage. This Diagnostic Trouble Code (DTC) is set when the input voltage is below 9 volts for greater than 15 seconds.





1. CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCs

NOTE: Make sure the battery is fully charged before proceeding.

1. Using the scan tool, read the active PCM DTCs.

Are there any battery or charging system DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 2

2. TEST FOR AN INTERMITTENT CONDITION
1. Using the scan tool, record and erase the Amplifier DTCs.
2. Start the engine.
3. Allow the engine to idle for two minutes.
4. Using the scan tool, read the Amplifier DTCs.

Does the scan tool display: B2199-16-BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD?

Yes

- Go To 3

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.

3. CHECK THE (A931) FUSED B(+) CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE





NOTE: Check the fuse in the Totally Integrated Power Module (TIPM) for an open. If the fuse is open, make sure to check for a short to ground prior to replacing the fuse.

1. Turn the ignition off.
2. Disconnect the Amplifier C1 harness connector.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check the (A931) Fused B(+) circuit in the Amplifier C1 harness connector.
5. The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open or excessive resistance in the (A931) Fused B(+) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE




1. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit in the Amplifier C1 harness connector.
2. The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

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

No

- Repair the open or excessive resistance in the (Z911) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.