Measure the resistance between the steering switch connector terminals 14 to 17 and 15 to 17.
Standard
Between terminals 14 – 17
START / STOP switch ON
: 1982 – 2063 Ω
switch ON
: 708 – 737 Ω
SEEK DOWN switch ON
: 314 – 327 Ω
SEEK UP switch ON
: 118 – 123 Ω
SOURCE switch ON
: 1 Ω or less
Between terminals 15 – 17
MRK switch ON
: 708 – 737 Ω
switch ON
: 314 – 327 Ω
VOL UP switch ON
: 118 – 123 Ω
VOL DOWN switch ON
: 1 Ω or less