Pinpoint Test E: Poor Quality/Distorted/No Sound From One Or More Speakers (Not All Speakers) - Sony(R) Sound
Information and Entertainment System
Pinpoint Test E: Poor Quality/Distorted/No Sound From One Or More Speakers (Not All Speakers) - Sony(R) Sound
Refer to Wiring Diagram Set 130 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
The Audio Control Module (ACM) directs the audio signals to the audio Digital Signal Processing (DSP) module in the form of an AC voltage. The audio DSP module boosts the audio signals and sends them to the speakers. The audio DSP module provides internal circuit protection for shorts to ground or shorts to voltage.
A short to ground or short to voltage in the circuit to one of the speakers may cause multiple speakers to lose sound due to the built-in overload protection feature of the audio DSP module. In this case, a speaker fault DTC sets, and this pinpoint test should be followed to isolate the damaged circuit.
The ACM sends the audio signals to the audio DSP module in the following banks:
For vehicles with navigation, it is also important to note that if the navigation voice guidance setting is set too low, it may appear that the front speakers intermittently produce no sound. Make sure the voice guidance setting is set high enough to hear the voice guidance commands before addressing a concern with the front speakers.
The speaker walk test can be used to isolate a concern with a particular speaker. This can reduce the diagnostic steps necessary to isolate the concern. To carry out the speaker walk test, refer to Audio Control Module (ACM) Self-Diagnostic Mode Audio Control Module (ACM) Self-Diagnostic Mode.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Speaker
- Audio DSP module
- ACM
PINPOINT TEST E: POOR QUALITY/DISTORTED/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) - SONY(R) SOUND
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, Mounting and Cables Battery Disconnect.
-------------------------------------------------
E1 CHECK FOR AN AUDIO SIGNAL TO THE SUSPECT SPEAKER
- Ignition OFF.
- Disconnect: Suspect Speaker.
- Operate the audio system in radio tuner (AM/FM) mode.
- Measure the AC voltage between the suspect speaker pins, harness side as follows:
- Is a fluctuating AC voltage present?
Yes
INSTALL a new speaker for the suspect speaker. REFER to the appropriate removal and installation procedure. TEST the system for normal operation.
No
GO to E2.
-------------------------------------------------
E2 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: Audio DSP Module C4240a.
- Measure the voltage between the audio DSP module, harness side and ground as follows:
- Are the voltages greater than 10 volts?
Yes
GO to E3.
No
VERIFY the Battery Junction Box (BJB) fuse 19 (25A) is OK. If OK, REPAIR the circuit in question. TEST the system for normal operation. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
-------------------------------------------------
E3 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS FOR CONTINUITY
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the audio amplifier, harness side and ground as follows:
- Are the resistances less than 5 ohms?
Yes
GO to E4.
No
REPAIR the circuit in question. TEST the system for normal operation.
-------------------------------------------------
E4 CHECK FOR AN AUDIO SIGNAL AT THE AUDIO DSP MODULE
- Ignition OFF.
- Connect: Audio DSP Module C4240a.
- Disconnect: Audio DSP Module C4240c.
- Operate the audio system in radio tuner (AM/FM) mode.
- Measure the AC voltage between the audio DSP module pins, harness side as follows:
- Is a fluctuating AC voltage present?
Yes
GO to E5.
No
GO to E7.
-------------------------------------------------
E5 CHECK THE SPEAKER CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Connect: Audio DSP Module C4240c.
- Disconnect: Audio DSP Module C4240b (Except Subwoofer Concern).
- Disconnect: Audio DSP Module C4240a (Subwoofer Concern).
- Ignition ON.
- Measure the voltage between the suspect speaker, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to E6.
-------------------------------------------------
E6 CHECK THE SPEAKER CIRCUITS FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the audio DSP module, harness side and the suspect speaker, harness side; and between the audio DSP module, harness side and ground as follows:
- Are the resistances less than 5 ohms between the audio DSP module and the suspect speaker, and greater than 10,000 ohms between the audio DSP module and ground?
Yes
GO to E10.
No
REPAIR the circuit in question. TEST the system for normal operation.
-------------------------------------------------
E7 CHECK THE AUDIO CIRCUITS TO THE AUDIO DSP MODULE FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM C240a (Except Subwoofer Concern).
- Disconnect: ACM C240d (Subwoofer Concern).
- Disconnect: Audio DSP Module C4240c.
- Ignition ON.
- Measure the voltage between the audio DSP module pins, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR any DTCs present. TEST the system for normal operation.
No
GO to E8.
-------------------------------------------------
E8 CHECK THE AUDIO CIRCUITS TO THE AUDIO DSP MODULE FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the audio DSP module, harness side and the ACM, harness side; and between the audio DSP module, harness side and ground as follows:
- Are the resistances less than 5 ohms between the audio DSP module and the ACM and greater than 10,000 ohms between the audio DSP module and ground?
Yes
GO to E9.
No
REPAIR the circuit in question. CLEAR any DTCs present. TEST the system for normal operation.
-------------------------------------------------
E9 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- Connect: All Disconnected Connectors.
- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) - Fusion, Milan Audio Control Module (ACM) or Audio Control Module (ACM) - MKZ Audio Control Module (ACM). 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. CLEAR any DTCs present.
-------------------------------------------------
E10 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION
- Ignition OFF.
- Connect: All Disconnected Connectors.
- 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.
- Operate the system and determine if the concern is still present.
- 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. CLEAR any DTCs present.
-------------------------------------------------