Second Gear Start. about and how to add

HOW DOES IT WORK?
magic. just like timing belts, blinker fluid and muffler bearings.

Second gear start is actuated by the pcm commanding shift selonoid A to be deactivated, rendering the transmission in second gear. The in vehicle switch provides a ground to the PCM which controls the powertrain. and transmission.

What does it do?
It is a simple and primitive form of basic traction control.

91-93 GPs:
with second gear start have the switch at the front of the console, whether or not there was a DIC.
the switch is between the DIC and shifter on DIC cars, and on the slopped downward front surface of the console on non-DIC cars.
I have only seen the switch in 3.4 powered cars.
only 93 could have had the option of having the second gear start with a 3.1mpfi, if that was ever an option. I have actually not seen a 93 3.1 GP with a 4t60e since i started looking, but have seen at least 4 with 3t40?!?! i have seen a 3.1 mpfi 4t60e 1993 GP without a second gear start switch and a console, though they may still have had them.
they have a orange bulb (or LED?) at the switch to indicate if it is on. (do they have any indication in the gauge cluster?)

94-96 GPs
switch: located on the i/p knee pad near left side.
simple gray toggle switch mounted in a bezel.
two styles have been observed. one with an indicator LED imbedded, and one without.
EARLY 94 models have the illuminated indicator switch. (newest vehicle I have observed with the switch dated 10/94)
I have now also seen cars that are pre-wired for the illuminated switch but utilizing the regular switch. (dated 10/93 and 11/93)
All the GPs I've looked in have had in no matter the engine or the options, even the total stripper models, have SGS.
additionally, an indicator script in cluster stating "second gear start" in blue is present.

ADDING SECOND GEAR START in non GP models.
Underhood wiring in all the cars has been the same... the wire already exists in a non GP model from the PCM to the firewall connector. if you were to seperate the C100 connector and observe any wires on the engine side that were not continued into the body harness, and checking the wire color reveals it to be blue, that in the second gear start wire. (I will look up pin info later)

when i have added it, no matter which year 4t60e equipped vehicle, I use the 94-96 switch, as they are more common and are intended to be installed in a "cut" hole with the bezel. I add a wire to the body side of the C100 connector... and run it to the switch, and the other wire from the switch is grounded.

Merging Posts for Promotion to Articles
(Robby1870)

94-96 switch:
EARLY type 1994 GP second gear start switch connector:
A PNK hot in run, bulb test, or start (+)
B BLK ground (-)
C GRY variable backlighting (+)
D not used
E BLK ground (-)
F BLU second gear start feed (to PCM)

Late type 1994-1996 GP second gear start switch connector:
A PNK hot in run, bulb test, or start (+)
B BLK ground (-)
C not used
D not used
E not used
F not used

94-96 GP and 1994-1997 CS Headlight Switch maybe 94-96 Regal and 95+ Lumina/MC
[info courtesy of StockGP and 94 CS FSM]
Pin# Wire color Purpose(connection/source)
A BLK ground
B WHT dome light
C DK BLU door open input
D GRY door lock "lock" signal
E TAN driver door "unlock" signal
F PNK hot in run, bulb test, or start (+)
G BRN/WHT VF dimming output
H GRY variable backlighting
I GRY/BLK park lights "on" signal
J --- not used
K DK GRN headlights off signal to DRL (only on DRL equipped models)(also theoretic feed to FTP)
L YEL headlights on feed to dimmer switch
M --- not used
N RED circuit breaker hot ?
O ORN fused hot ?
P LT BLU park lights off signal to DRL(only on DRL equipped models)
R BRN Park lights on feed

CONNECTOR MATCHING INFO:

2GS F BLU second gear start feed (to PCM)
refer to related info on c100 or PCM location for your vehicle.

2GS E BLK ground (-)
2GS B BLK ground (-) (if applicable)
HLS A BLK ground

2GS C GRY variable backlighting (+) (if applicable)
HLS H GRY variable backlighting (+) (if applicable)

2GS A PNK hot in run, bulb test, or start (+)
HLS F PNK hot in run, bulb test, or start (+)

Wiring Information:

94-96 switch:
EARLY type 1994 GP second gear start switch connector:
A PNK hot in run, bulb test, or start (+)
B BLK ground (-)
C GRY variable backlighting (+)
D not used
E BLK ground (-)
F BLU second gear start feed (to PCM)

Late type 1994-1996 GP second gear start switch connector:
A PNK hot in run, bulb test, or start (+)
B BLK ground (-)
C not used
D not used
E not used
F not used

94-96 GP and 1994-1997 CS Headlight Switch maybe 94-96 Regal and 95+ Lumina/MC
[info courtesy of StockGP and 94 CS FSM]
Pin# Wire color Purpose(connection/source)
A BLK ground
B WHT dome light
C DK BLU door open input
D GRY door lock "lock" signal
E TAN driver door "unlock" signal
F PNK hot in run, bulb test, or start (+)
G BRN/WHT VF dimming output
H GRY variable backlighting
I GRY/BLK park lights "on" signal
J --- not used
K DK GRN headlights off signal to DRL (only on DRL equipped models)(also theoretic feed to FTP)
L YEL headlights on feed to dimmer switch
M --- not used
N RED circuit breaker hot ?
O ORN fused hot ?
P LT BLU park lights off signal to DRL(only on DRL equipped models)
R BRN Park lights on feed

CONNECTOR MATCHING INFO:

2GS F BLU second gear start feed (to PCM)
refer to related info on c100 or PCM location for your vehicle.

2GS E BLK ground (-)
2GS B BLK ground (-) (if applicable)
HLS A BLK ground

2GS C GRY variable backlighting (+) (if applicable)
HLS H GRY variable backlighting (+) (if applicable)

2GS A PNK hot in run, bulb test, or start (+)
HLS F PNK hot in run, bulb test, or start (+)

1992:
PCM position: D6
C100 harness position: E4
color: Dark Blue

1994:
PCM position: C22
C100 harness position: J1
color: white/black stripe? [Dark Blue observed]

1996:
WIRE PRESENT IN OLDSMOBILE AND GRAND PRIX ONLY, per 1996 FSM
PCM position: ??
C100 harness position: J1
color: Blue