Service Hints

I 19-A, I 20-B, I 21-C INSTRUMENT ECU
A 21-GROUND : Approx. 12 volts with ignition SW ACC or ON position
B 2-GROUND : Approx. 12 volts with stop light SW at ON
C 1-GROUND : Always approx. 12 volts
C 2-GROUND : Approx. 12 volts with ignition SW at ON or ST position

S 5 STOP LIGHT SW
2-1 : Closed with brake pedal depressed