RENAULT Rear Seat Entertainment System Control Module fault diagnosis and Repair

WORKING PRINCIPLE

  A micro-controller in the Control Module supplies and controls the power to the system via an I2C bus. On receipt of a power-on command from the Infrared Controller it performs a simple system check and then sends commands to other parts of the system to bring them on line.  When a screen has been selected using the infrared remote control the Control Module identifies the selected screen and displays on it a menu providing the user with access to the functions detailed below:

• Independent switching of three Audio-Visual inputs (DVD, TV and AUX)
• Video manipulation (Colour, brightness, contrast and aspect ratio of the display.)
• Audio processor (Bass, Treble and Volume)
• On-Screen instructions language selection
• Switch on/off individual screen displays

  The Control Module also determines which media source has been routed to the selected screen and relays commands in the appropriate protocol. For example if, while Screen A is displaying the DVD transmission, an infrared play command is detected at screen A, it would be captured, stored and relayed to the DVD in the DVD's Infrared protocol. If screen B is displaying a TV transmission the play command would be transmitted in the vehicle's TV tuner infrared protocol. A non-volatile memory stores the display instruction language in use and the current Audio and Video settings for each output channel. These settings are reloaded on power-up with the exception of the audio volume level, which defaults to a low state. Support equipment that has been powered off is detected by the lack of video sync pulse. This can be caused by auto shutdown after extended pause mode. When this happens the module responds by transmitting a power-on command to the support equipment until it is ready to accept it and power up. The supply of the video sync pulse then resumes and the module stops transmitting the power-on command.

DISASSEMBLY

• Loosen screws 1 to 4 and remove the control box lid.
• Remove screws 5 to 8. and separate the PCB from the control box base.
• Visually inspect the components for obvious signs of mechanical or electrical damage.

Diagnosis and Repair

* Connect the open control module to the test kit.

* Connect the 12.5 V power supplies to the test kit.

* Compare the symptoms observed. 

Initial Inspection and Test with the symptoms listed below to locate the components likely to be faulty and effect the necessary repairs.

CONNECTION DIAGRAM

CLICK ON THE PICTURES TO MAGNIFY