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F5: ACTUATOR TEST - RADIO BUS TEST RADIO CIRCUIT SCL VOLTAGE LOW > < TABLE 2,TROUBLE CODES - Trouble Code 121 RADIO BUS COMMUNICATION

Omega B

Table 5, F5:ACTUATOR TEST

 

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

01

RADIO BUS TEST

Ignition ON, Radio OFF

 

121

8,9,10, 11/2

 

 

Press key F5 (actuator test) in system menu. Follow instructions of TECH 1.

 

 

 

 

 

Start actuator test..

RADIO BUS TEST

 

 

 

 

 

 

TEST OKAY!

 

 

 

 

Note:

 

If instructions of TECH 1 are not followed exactly, a faulty diagnosis can result. When radio is switched on, a self-test of the radio display bus is automatically performed. During this self-test the radio unit sends certain signals via the radio display bus to the MID. TECH 1 reads these signals from the MID and evaluates them.

 

 

 

 

 

 

 

 

 

 

 

 

If the adjacent nominal value does not appear in the TECH 1 display, TECH 1 specifies the exact fault and fault location. Definitions:

 

 

 

 

 

 

 

 

 

 

 

 

SCL    Serial Clock Line; Ter. 9*

 

 

 

 

 

MRQ  Master Request Line; Ter. 10*

 

 

 

 

 

SDA   Serial Data Line; Ter. 11*

 

 

 

 

 

 

 

* = MID wiring harness plug, 26-pin

 

 

 

 

 

 

 

 
Related Literature Units
-TABLE 2,TROUBLE CODES - Trouble Code 121 RADIO BUS COMMUNICATION

F5: ACTUATOR TEST - RADIO BUS TEST RADIO CIRCUIT SCL VOLTAGE LOW > < TABLE 2,TROUBLE CODES - Trouble Code 121 RADIO BUS COMMUNICATION