Diagnosis CCC - Self- and system tests

Diagnosis CCC - Self- and system tests

Background

The Car Communication Computer (CCC) contains the following five control units:

1. CCC-A / applications
   
2. CCC-ASK / Audio System Controller
   
3. CCC-GW / gateway
   
4. CCC-BO / user interface
   
5. CCC-ANT / aerial tuner
   

To detect faults, there are several test routines in each of these control units. If there are faults, they are entered in the corresponding fault code memory. During operation, however, due to the additional load on the processor, not all of the present test routines are run.

These additional test routines have to be started separately. For this purpose, there are so-called self-tests for each control unit and in some control units additional system tests. If these are started, several individual tests are carried out. If faults occur, entries are also made in the fault code memory.

This means that for a thorough diagnosis, the self-tests and system tests of the individual control units have to be run before fault code memory can be checked.

This is done automatically in the present inspection plans for the CCC.

This document describes scope of the self-tests and system test in the individual control units.

Self-tests

CCC-A / applications

• Hardware of the navigation computer (HIP)
  
• File system
  
• Memory of the navigation computer
  
• Power supply of the navigation computer
  
• Voltage of the rotating-speed sensor
  
• State of the rotating-speed sensor
  

CCC-ANT / aerial tuner

• Hardware of the tuner
  
• Connection to the aerial diversity
  
• Memory of the tuner
  
• Internal 8.5-V voltage
  

CCC-ASK / Audio System Controller

• Hardware of the ASK
  
• Memory of the ASK
  
• Connection to the MD drive (if fitted)
  

CCC-BO / user interface

• Hardware of the processor board
  
• Connection to DVD drive
  
• Memory of the processor board
  
• Boot file
  

CCC-GW / gateway

• Hardware of the gateway
  
• RAD_ON signal
  
• Internal voltages of the CCC
  
• Memory of the gateway
  
• Temperatures in the CCC with exception of the DVD drive
  

System tests

CCC-A / applications

• Connection to GPS aerial
  
• Connection to the navigation computer
  

CCC-ANT / aerial tuner

• CCC-internal connections
  
• Connection to radio aerial
  

CCC-ASK / Audio System Controller

• Microphone
  
• Mute signal
  
• Audio input / audio output
  
• Connection to telephone
  
• Voice recognition system
  
• CCC-internal connections
  

CCC-BO / user interface

• Hardware of the processor board
  
• Connection to Central Information Display
  
• CAN-bus
  
• Internal MOST bus
  
• Voice recognition system
  

CCC-GW / gateway

• Hardware of the gateway
  
• CAN-bus
  
• MOST bus
  
• Fan
  
• Connection to the loudspeakers
  
• Terminal 58g (instrument lighting)