GM Service Manual Online
For 1990-2009 cars only

Transmission Range Switch Logic (4L30-E)

Selector Position

Transmission Range Switch Terminal

A

B

C

D*

F

G

Park

On

Off

Off

On

Off

On

Reverse

On

On

Off

On

On

Off

Neutral

Off

On

Off

On

Off

On

Drive

Off

On

On

On

Off

Off

D3

On

On

On

On

Off

On

D2

On

Off

On

On

Off

Off

D1

Off

Off

On

On

Off

On

ON indicates the terminal or circuit should read system voltage (continuity).

OFF indicates an open circuit.

*Power supply terminal.