Pinpoint Test AA: DTC U3003:16 (Audio Digital Signal Processing (DSP) Module)

Information and Entertainment System

Pinpoint Tests

Pinpoint Test AA: DTC U3003:16 (Audio Digital Signal Processing (DSP) Module)

Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number

Normal Operation
- DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - set by the audio Digital Signal Processing (DSP) module when the supply voltage on circuit SBB20 (GY/RD) or circuit SBB21 (GN/RD) falls below 10 volts for at least 10 seconds during normal operation, or for greater than 250 milliseconds during the self-test.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- High circuit resistance
- Audio DSP module



PINPOINT TEST AA: DTC U3003:16 (AUDIO DSP MODULE)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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AA1 RECHECK THE AUDIO DSP MODULE DTCs


- Clear the audio DSP module DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 15 seconds.
- Repeat the audio DSP module self-test.
- Is DTC U3003:16 still present?

Yes
GO to AA2.

No
The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.

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AA2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


- Retrieve the continuous memory DTCs from all modules.
- Is DTC P0620, P0622, P0625, or P065B set in the PCM?

Yes
REFER to Charging System.

No
GO to AA3.

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AA3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE


- Check the battery condition and verify that the battery is fully charged. Refer to Battery.
- Is the battery OK and fully charged?

Yes
GO to AA4.

No
REFER to Battery.

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AA4 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY


- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: Audio DSP Module C4326b.
- Ignition ON.
- Measure the voltage between the audio DSP module, harness side and ground as follows:





- Are the voltages within 0.2 volt of the recorded battery voltage?

Yes
GO to AA5.

No
REPAIR the circuit in question for high resistance. CLEAR the DTC. REPEAT the self-test.

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AA5 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the audio DSP module, harness side and ground as follows:





- Are the resistances less than 5 ohms?

Yes
GO to AA6.

No
REPAIR the circuit in question for high resistance. TEST the system for normal operation.

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AA6 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION


- Disconnect the audio DSP module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the audio DSP module connector and make sure it seats correctly.
- Is the concern still present?

Yes
INSTALL a new audio DSP module. REFER to Audio Digital Signal Processing (DSP) Module Audio Digital Signal Processing (DSP) Module. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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