Pinpoint Test As: DTC U3003:16 (Audio DSP Module)

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 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 AND CABLES .

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 .
- 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 AND CABLES .
- Is the battery OK and fully charged?
- Yes : GO to AS4.
- No : REFER to BATTERY, MOUNTING AND CABLES .

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.

Fig 1: Measuring Voltage Between Audio DSP Module C4240A-5 And Ground
Courtesy of FORD MOTOR CO.

For vehicles with THX® sound, measure the voltage between the audio DSP module, harness side and ground as follows:

TERMINAL VOLTAGE REFERENCE

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

Fig 2: Measuring Voltage Between Audio DSP Module And Ground

Courtesy of FORD MOTOR CO.

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

Yes : GO to AS5.
No : REPAIR the circuit in question for high resistance. CLEAR the DTC. REPEAT the self-test.

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.

Fig 3: Measuring Resistance Between Audio DSP Module C4240A-13 And Ground
Courtesy of FORD MOTOR CO.

For vehicles with THX® audio, measure the resistance between the audio DSP module, harness side and ground as follows:

TERMINAL RESISTANCE REFERENCE

Positive Meter Lead	Negative Meter Lead
C4235a-22	GD148 (BK/YE)
C4235a-23	GD148 (BK/YE)
C4235a-24	GD148 (BK/YE)

Fig 4: Measuring Resistance Between Audio DSP Module And Ground

Courtesy of FORD MOTOR CO.

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 . 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.