Checking The Remote Control Signal

HINT: If none of the screens come on in the previous test, the probable cause is a damaged remote control or discharged batteries.

HINT: If only one screen does not come on in the previous test, it indicates that the cable for infrared (IR) signals is probably damaged.

HINT: Activation of the infrared IR-receivers in the head restraints can be checked by the IR-lights in the screen's lower edge being on dimly after the system has been turned on.

Checking IR-signal, left screen

Check the lead for the infrared (IR) signal between the screen and rear seat entertainment module (RSE) for open circuit.

To check the voltage level on the signal cable for IR-signal, proceed as follows:

Connect all cables and connectors.
Measure the voltage between the signal cable for the Infra Red (IR) signal to the left-hand display screen and ground. The measured voltage is reference value.
NOTE:
Do not press any of the buttons on the remote control during this measurement.
Measure from the rear side of a suitable connector. Do not damage the terminals in the connector.
Aim the remote control at the left screen and press in a button on the remote control. The voltage on the signal cable must fall slightly for as long as the button on the remote control is pressed in.

NOTE:

Important in this measurement are not the absolute voltage levels, instead you get a voltage difference downward.

Checking IR-signal, right screen

Compare the latest reading as above with the signal for the infra red (IR) signal from the right-hand infra red (IR) receiver for the display screen.

Conclusion

If the result of the above checks is that no malfunction was found, this means that the receivers in both screens work and that the remote control is OK.
If voltages on the cables are OK but a lower voltage cannot be measured when a button on the remote control is pressed down, try with replacing the remote control.

Other information

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see VERIFICATION