Pinpoint Test P: Poor Quality/Distorted Audio-Video/No Sound While in Family Entertainment Mode - All Other Functions Operate C
Information and Entertainment System
Pinpoint Tests
Pinpoint Test P: Poor Quality/Distorted Audio-Video/No Sound While in Family Entertainment Mode - All Other Functions Operate Correctly
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
Each DVD player sends audio signals to the Rear Entertainment Module (RETM) through a dedicated set of circuits. The RETM then sends the audio signals to the Audio Control Module (ACM). The RETM audio output also contains SYNC system audio if the vehicle is equipped with the SYNC system.
In single-play mode, audio from the RETM is broadcast through all vehicle speakers when family entertainment mode is selected. In dual-play mode, the RETM mutes the audio output to the rear speakers so that separate audio can be played on the front speakers, while the headphones continue to broadcast the audio from the family entertainment system.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DVD player
- RETM
- RETM
PINPOINT TEST P: POOR QUALITY/DISTORTED AUDIO-VIDEO/NO SOUND WHILE IN FAMILY ENTERTAINMENT MODE - ALL OTHER FUNCTIONS OPERATE CORRECTLY
NOTICE: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
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P1 DETERMINE THE SPECIFIC CONCERN
- Operate the audio system in single-play family entertainment mode.
- Insert a known good DVD into the LH DVD player and select "LH" as the source using the Front Controls Interface Module (FCIM) or Front Display Interface Module (FDIM).
- Observe the family entertainment system audio output.
- Insert the known good DVD into the RH DVD player and select "RH" as the source using the FCIM or FDIM.
- Observe the family entertainment system audio output.
- Is the family entertainment audio inoperative for both DVD players?
Yes
GO to P5.
No
GO to P2.
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P2 ISOLATE THE DVD PLAYER
- Ignition OFF.
- Remove both DVD players and install the suspect DVD player on the opposite headrest. Refer to Digital Versatile Disc (DVD) Player Service and Repair.
- Operate the audio system in single-play family entertainment mode.
- Using a known good DVD, check the audio output for the suspect DVD player.
- Is the family entertainment system audio inoperative with the suspect DVD player in the opposite headrest?
Yes
INSTALL a new DVD player for the suspect DVD player. REFER to Digital Versatile Disc (DVD) Player Service and Repair. TEST the system for normal operation.
No
GO to P3.
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P3 CHECK THE DVD PLAYER AUDIO OUTPUT CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: RETM C2949a.
- Disconnect: LH DVD Player C3370a and C3370b (LH Concern).
- Disconnect: RH DVD Player C3371a and C3371b (RH Concern).
- Ignition ON.
- Measure the voltage between the RETM, 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 P4.
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P4 CHECK THE DVD AUDIO OUTPUT CIRCUITS FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the RETM, harness side and the DVD player, harness side; and between the RETM, harness side and ground as follows:
- Is the resistance less than 5 ohms between the RETM and the suspect DVD player, and greater than 10,000 ohms between the RETM and ground?
Yes
GO to P7.
No
REPAIR the circuit in question. TEST the system for normal operation.
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P5 CHECK THE RETM AUDIO OUTPUT CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: RETM C2949b.
- Disconnect: ACM C240c.
- Ignition ON.
- Measure the voltage between the RETM, 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 P6.
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P6 CHECK THE RETM AUDIO OUTPUT CIRCUITS FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the ACM, harness side and the RETM, harness side; and between the ACM, harness side and ground as follows:
- Is the resistance less than 5 ohms between the ACM and the RETM, and greater than 10,000 ohms between the ACM and ground?
Yes
GO to P7.
No
REPAIR the circuit in question. TEST the system for normal operation.
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P7 CHECK FOR CORRECT RETM OPERATION
- Disconnect all the RETM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RETM connectors and make sure they seat correctly.
- Is the concern still present?
Yes
INSTALL a new RETM. REFER to Rear Entertainment Module (RETM) Rear Entertainment Module (RETM). 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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