Pinpoint Test D: No Sound From All Speakers
Information and Entertainment System
Pinpoint Test D: No Sound From All Speakers
Normal Operation - Vehicles Without Sony(R) Sound
When the ignition is in the START position, voltage is supplied to the Audio Front Control Module (ACM) through the start sense circuit. When the ACM (Audio Front Control Module) receives this voltage, it mutes the speaker output to prevent popping in the speakers as a result of voltage spikes during engine cranking, However, if there is a short to voltage on this circuit, the ACM (Audio Front Control Module) continuously mutes the audio output, resulting in no sound from all speakers.
Sony(R) Sound
When the ignition is in the START position, voltage is supplied to the ACM (Audio Front Control Module) through the start sense circuit. When the ACM (Audio Front Control Module) receives this voltage, the ACM (Audio Front Control Module) uses a mute circuit to mute the audio Digital Signal Processing (DSP) module. This prevents popping in the speakers as a result of voltage spikes during engine cranking. The audio DSP (Digital Signal Processing) module is muted if less then 3.5 volts is detected on the mute circuit. The audio DSP (Digital Signal Processing) module is enabled through software. An open or short to ground in the mute circuit causes the audio system to produce no sound.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Audio DSP (Digital Signal Processing) module
- ACM (Audio Front Control Module)
PINPOINT TEST D : POOR QUALITY/DISTORTED/NO SOUND FROM ALL SPEAKERS
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
D1 CHECK THE START SENSE CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM (Audio Front Control Module) C290A.
- Ignition ON.
- Measure the voltage between the ACM (Audio Front Control Module) C290A-15, circuit CDC54 (WH/GN), harness side and ground.
Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
For vehicles with Sony(R) Sound, GO to D2.
For vehicles without Sony(R) Sound, GO to D7.
D2 CHECK THE AUDIO DSP (Digital Signal Processing) MODULE VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: Audio DSP (Digital Signal Processing) Module C3154C.
- Measure the voltage between the audio DSP (Digital Signal Processing) module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C3154C-5
SBP19 (BU/RD) Ground C3154C-6
SBP19 (BU/RD) Ground
Are the voltages greater than 10 volts?
Yes
GO to D3.
No
VERIFY BCM (Body Control Module) fuse 19 (20A) 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 [1][2]Diagrams By Number.
D3 CHECK THE AUDIO DSP (Digital Signal Processing) MODULE GROUND CIRCUITS FOR CONTINUITY
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the audio amplifier, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C3154C-15
GD148 (BK/YE) Ground C3154C-16
GD148 (BK/YE) Ground
Are the resistances less than 5 ohms?
Yes
GO to D4.
No
REPAIR the circuit in question. TEST the system for normal operation.
D4 CHECK THE AUDIO DSP (Digital Signal Processing) MODULE MUTE CIRCUIT FOR CORRECT VOLTAGE
- Connect: Audio DSP (Digital Signal Processing) Module C3154C.
- Connect: Negative Battery Cable.
- Disconnect: Audio DSP (Digital Signal Processing) Module C3154A.
- Operate the audio system in radio tuner (AM/FM) mode.
- Measure the voltage between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT/RD) (without navigation) or (VT) (with navigation), harness side and ground.
Is the voltage at least 3.5 volts?
Yes
GO to D8.
No
GO to D5.
D5 CHECK THE AUDIO DSP (Digital Signal Processing) MODULE ENABLE CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM (Audio Front Control Module) C290A.
- Measure the voltage between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT/RD) (without navigation) or (VT) (with navigation), harness side and ground.
Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to D6.
D6 CHECK THE AUDIO DSP (Digital Signal Processing) MODULE ENABLE CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- For vehicles with navigation, measure the resistance between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT), harness side and the ACM (Audio Front Control Module) C290A-7, circuit SME23 (VT), harness side; and between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT), harness side and ground.
- For vehicles without navigation, measure the resistance between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT/RD), harness side and the ACM (Audio Front Control Module) C290D-4, circuit SME23 (VT/RD), harness side; and between the audio DSP (Digital Signal Processing) module C3154A-3, circuit SME23 (VT/RD), harness side and ground.
Is the resistance less than 5 ohms between the audio DSP (Digital Signal Processing) module and the ACM (Audio Front Control Module), and greater than 10,000 ohms between the audio DSP (Digital Signal Processing) module and ground?
Yes
GO to D7.
No
REPAIR the circuit. TEST the system for normal operation.
D7 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION
- Ignition OFF.
- Disconnect all the ACM (Audio Front Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM (Audio Front Control 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 ACM (Audio Front Control Module). REFER to 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.
D8 CHECK FOR CORRECT AUDIO DSP (Digital Signal Processing) MODULE OPERATION
- Ignition OFF.
- Connect: All Disconnected Connectors.
- Disconnect all the audio DSP (Digital Signal Processing) module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the audio DSP (Digital Signal Processing) 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 (Digital Signal Processing) module. REFER to Audio Digital Signal Processing (DSP) Module - Front Captain's Chair or Audio Digital Signal Processing (DSP) Module - Split Bench . 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.