Unit installation

83
Standard sound system diagnosis
The diagnosis process is effected via address
word 47 as in the case of the series equipment,
however, the separate control unit for digital sound
system, J525, is now addressed. In addition to
reading the measured-value blocks and the fault
memory for all loudspeaker channels involved,
selective actuator tests are also available.
The digital sound system control unit participates in
component protection.
Measured-value block Designation
01 General: Battery positive voltage, terminal status
02 MOST: MOST address, FOT temperature, optical lowering (0 dB, -3 dB)
03 Status of ring break diagnosis line
04 System: Analogue/digital unit temperatures in amplifier, fan speed
05 Microphone: Voltage readings at microphone inputs
50 Control unit identification: Year of manufacture, manufacturer code
51 Control unit identification: Serial number
No. Designation Actuator test
Sequential Selective
1 Mid/high-pitch loudspeaker, front left R26 X X
2 Mid/high-pitch loudspeaker, front right R27 X X
3 High-pitch loudspeaker, rear left R14 X X
4 Mid/low-pitch loudspeaker, rear left R159 X X
5 High-pitch loudspeaker, rear right R16 X X
6 Mid/low-pitch loudspeaker, rear right R160 X X
9 Low-pitch loudspeaker, front left R21 X X
10 Low-pitch loudspeaker, front right R23 X X
Available actuator tests