GM Service Manual Online
For 1990-2009 cars only

Shift Lever Position

P Signal

R Signal

N Signal

D Signal

I Signal

L Signal

FWD Signal

Park (P)

LOW

HI

HI

HI

HI

HI

HI

Reverse (R)

HI

LOW

HI

HI

HI

HI

HI

Neutral (N)

HI

HI

LOW

HI

HI

HI

HI

Drive (D)

HI

HI

HI

LOW

HI

HI

LOW

Intermediate (I)

HI

HI

HI

HI

LOW

HI

LOW

Low (L)

HI

HI

HI

HI

HI

LOW

HI

HI = Ignition Voltage

LOW = 0 Volts