Pinpoint Test M: The Voice Guidance Is Inoperative/Does Not Operate Correctly
Information and Entertainment System
Pinpoint Tests
Pinpoint Test M: The Voice Guidance Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
For the Audiophile navigation system, the Audio Control Module (ACM) provides voice-assisted route guidance through the front speakers.
For the THX(R) navigation system, the ACM sends voice guidance audio signals to the audio Digital Signal Processing (DSP) module through circuits RMN07 (VT) and VMN07 (GY). The voice-assisted route guidance is broadcast through the instrument panel speaker.
For all navigation audio systems, the volume of the voice guidance is controlled by the ACM.
This pinpoint test is intended to diagnose the following:
- Incorrect system setting
- Wiring, terminals or connectors (THX(R) only)
- Audio DSP module (if equipped)
- ACM
PINPOINT TEST M: THE VOICE GUIDANCE IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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M1 CHECK THE VOICE GUIDANCE SETTING
- Operate the audio system in navigation mode.
- Press the MENU button.
- Select the FEEDBACK tab.
- Select DEFAULT SETTING.
- Verify the operation of the voice guidance.
- Does the voice guidance operate correctly?
Yes
The system is operating correctly at this time. The concern was caused by a customer-selected setting.
No
If the vehicle is equipped with THX(R) audio, GO to M2.
Otherwise, GO to M6.
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M2 CHECK THE INSTRUMENT PANEL SPEAKER
- Carry out the speaker walk-around test.
- Does the instrument panel speaker operate correctly?
Yes
GO to M3.
No
Go To Pinpoint Test C. Pinpoint Test C: Poor Quality/Distorted/No Sound From One Or More Speakers (Not All Speakers) - THX(R) Audio System
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M3 CHECK THE NAVIGATION AUDIO SIGNAL TO THE AUDIO DSP MODULE
- Ignition OFF.
- Disconnect: Audio DSP Module 4326c.
- Operate the audio system in navigation mode.
- While pressing the REPEAT button on the ACM, measure the AC voltage between the audio DSP module C4326c-6, circuit VMN07 (GY), harness side and the audio DSP module C4326c-16, circuit RMN07 (VT), harness side.
- Is a fluctuating AC voltage present?
Yes
GO to M7.
No
GO to M4.
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M4 CHECK CIRCUITS RMN07 (VT) AND VMN07 (GY) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM C240d.
- Ignition ON.
- Measure the voltage between the ACM C240d-1, circuit VMN07 (GY), harness side and ground; and between the ACM C240d-2, circuit RMN07 (VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to M5.
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M5 CHECK CIRCUITS RMN07 (VT) AND VMN07 (GY) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the audio DSP module, harness side and the ACM, harness side, as follows:
- Is the resistance 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 M6.
No
REPAIR the circuit in question. TEST the system for normal operation.
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M6 CHECK FOR CORRECT ACM OPERATION
- 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 verify 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) - Fusion, Milan or Audio Control Module (ACM) - MKZ . TEST the system for normal operation after the repair.
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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M7 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.
- Operate the system and verify 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.
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