Test: Image, RGB

On-board monitor system with video module

Work through the corresponding test modules in the diagnostic program for the video module in order to check the AF lines:

On-board monitor system without video module

Symptoms: Faults in menu display AND navigation; no menu display.

Instructions:

• Disconnect plug connection X1313
  
• Measure resistance at disconnected plug connection (vehicle wiring harness end):
  Between pin 7 and pin 16, setpoint: approx. 50 Ohm
  Between pin 7 and pin 17, setpoint: approx. 50 Ohm
  Between pin 7 and pin 18, setpoint: approx. 50 Ohm
  If at least one of the measured values is NOT in the specified range: Check lines from navigation computer to on-board computer and repair if necessary. If OK: Replace on-board monitor
  

If measured values are in specified range:

• Select multimeter in measuring systems.
  Settings: Direct voltage , measuring range +/- 2 V
  
• Connect test adapter 61 4 470 with 26-pin test box to plug connector X1313.
  Navigation computer AND on-board monitor must be connected!
  
• Switch off radio, switch on on-board monitor, display main menu (if possible)
  
• Measure voltage
  Between pin 5 and terminal 31 (vehicle ground)
  Between pin 6 and terminal 31 (vehicle ground)
  Between pin 7 and terminal 31 (vehicle ground)
  

Evaluating results

If on at least one of the 3 lines:

U = 0 V:Replace navigation computer.

U >= 1.4 V:Replace on-board monitor

If on all 3 lines:

1.4 V > U >= 0.5 V:carry out the 3rd check as described in the following

3rd check

• Test adapter 61 4 470 with 26-pin test box connected, navigation computer and on-board monitor plugged in.
  
• Multimeter selected
  Setting: Alternating voltage , measuring range: +/- 1 V
  
• Measure voltage
  Between pin 5 and terminal 31 (vehicle ground)
  Between pin 6 and terminal 31 (vehicle ground)
  Between pin 7 and terminal 31 (vehicle ground)
  

Setpoints: