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Brake Light Switch Circuit > < Control Unit Hardware and Software

 

 

 

 

C-03, circuit system voltage  

C-03, circuit system voltage  

Test  

Work order description  

Nominal value  

T01  

Check: Battery voltage  

 

 

•  All loads switched off  

•  Ignition ON  

•  Measure voltage between following terminals:  

greater than 13 V  

 

  Battery G1 +  

  Terminal 30  

  &  

  Battery G1 -  

  Terminal 31  
 
 
 

 

 

Yes:   T02  

No:   E01  

T02  

Check: Battery voltage during engine start  

 

 

•  Start engine  

•  Measure voltage between following terminals:  

greater than 8 V,  
Starter runs  
 

 

  Battery G1 +  

  Terminal 30  

  &  

  Battery G1 -  

  Terminal 31  
 
 
 

 

 

Yes:   T03  

No:   E02  

T03  

Check: Alternator voltage  

 

 

•  Engine runs  

•  Measure voltage between following terminals:  

13...15 V  

 

  Battery G1 +  

  Terminal 30  

  &  

  Battery G1 -  

  Terminal 31  
 
 
 

 

 

Yes:   T04  

No:   E03  

T04  

Check: Control unit supply voltage  

 

 

•  Ignition OFF  

•  Disconnect wiring harness plug from:  

11.5...13.5 V  

 

  K50 ABS control unit  

 

 

•  Ignition ON  

•  Measure voltage between following terminals:  

 

 

  K50 ABS control unit  

  Wiring harness plug terminal 15  

  &  

  Ground  
 
 
 

 

 

Yes:   T05  

No:   E04  

T05  

Check: Ground connection of the control unit  

 

 

•  Ignition ON  

•  Measure voltage between following terminals:  

11.5...13.5 V  

 

  K50 ABS control unit  

  Wiring harness plug terminal 15  

  &  

  K50 ABS control unit  

  Wiring harness plug terminal 19  
 
 
 

 

 

Yes:   T06  

No:   E05  

T06  

Check: Tester  

 

 

•  Ignition OFF  

•  Connect wiring harness plug from:  

OK  

 

  K50 ABS control unit  

 

 

•  Ignition ON  

•  Select using TECH1:  

 

 

  F0:DATA LIST NO. T01  

  BATTERY VOLTAGE  
 
 
 

 

 

Yes:   E07  

No:   E06  

 

C-03, circuit system voltage  

No.  

Result  

E01  

•  Defective components:  

 

  Battery discharged or defective  
 
 
 

E02  

•  Defective components:  

 

  Battery discharged or defective  

 

or  

 

•  Reference to other system:  

 

  M1 starter  
 
 
 

E03  

•  Defective components:  

 

  Alternator/ control unit defective  
 
 
 

E04  

•  Short circuit to ground/ circuit interruption between:  

 

  K50 ABS control unit  

  Wiring harness plug terminal 15  

  &  

  Battery G1  

  Terminal 15  

 

or  

 

•  Defective components:  

 

  Fuse F22  

  Instrument panel X6 & front body 45P  

  Wiring harness plug terminal 71  
 
 
 

E05  

•  Circuit interruption:  

 

  K50 ABS control unit  

  Wiring harness plug terminal 19  

  &  

  Battery G1  

  Terminal 31  

 

or  

 

•  Defective components:  

 

  Instrument panel X6 & front body 45P  

  Wiring harness plug terminal 52  
 
 
 

E06  

•  Defective components:  

 

  K50 ABS control unit  
 
 
 

E07  

•  Defective components:  

 

  Transitional resistance in the wiring harness  
 
 
 

 


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Brake Light Switch Circuit > < Control Unit Hardware and Software