Service Hints

I19 (A), I20 (B), I21 (C) INSTRUMENT ECU
(A)21-GROUND : Approx. 12 Volts with ignition SW ACC or ONposition
(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 STposition

S5 STOP LIGHT SW
2-1 : Closed with brake pedal depressed