Pinpoint Test As: DTC U3003:16 (Audio DSP Module)
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
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, MOUNTING & CABLES -- FUSION, MILAN & MKZ
article.
- AS1 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 AS2.
- No : The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.
- AS2 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 -- FUSION, MILAN & MKZ article.
- No : GO to AS3.
- AS3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Check the battery condition and verify that the battery is fully charged. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
- Is the battery OK and fully charged?
- Yes : GO to AS4.
- No : REFER to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
- AS4 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY
- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: Audio DSP Module C4240a (Sony® Sound) or C4235a (THX® Sound).
- Ignition ON.
- For vehicles with Sony® sound, measure the voltage between the audio DSP module C4240a-5, circuit SBP19 (BU/RD), harness side and ground; and between the audio DSP module C4240a-6, circuit SBP19 (BU/RD), harness side and ground.
- For vehicles with THX® sound, measure the voltage between the audio DSP module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C4235a-9 SBB20 (GN/RD) Ground C4235a-10 SBB20 (GN/RD) Ground C4235a-11 SBB21 (GY/RD) Ground C4235a-12 SBB21 (GY/RD) Ground
- Yes : GO to AS5.
- No : REPAIR the circuit in question for high resistance. CLEAR the DTC. REPEAT the self-test.
- Are the voltages within 0.2 volt of the recorded battery voltage?
Courtesy of FORD MOTOR CO.
- AS5 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS FOR CONTINUITY
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- For vehicles with Sony® audio, measure the resistance between the audio DSP module C4240a-13, circuit GD148 (BK/YE), harness side and ground; and between the audio DSP module C4240a-14, circuit GD148 (BK/YE), harness side and ground.
- For vehicles with THX® audio, measure the resistance between the audio DSP module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C4235a-22 GD148 (BK/YE) C4235a-23 GD148 (BK/YE) C4235a-24 GD148 (BK/YE) - Are the resistances less than 5 ohms?
- Yes : GO to AS6.
- No : REPAIR the circuit in question for high resistance. TEST the system for normal operation.
- AS6 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION
- Disconnect all the audio DSP module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the audio DSP module connectors and make sure they seat correctly.
- Is the concern still present?
- Yes : INSTALL a new audio DSP module. REFER to AUDIO DIGITAL SIGNAL PROCESSING (DSP) MODULE in this service information. 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.