Automatic Transmission Inline 20-Way Connector End View

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

AT Inline 20-way Connector, Transmission Side Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12160782 20-way F Micro-Pack 100W Series (GRY)
Pin	Wire Color	Circuit No.	Function
A	LT GRN	1222	1-2 Shift Solenoid Valve Control
B	YEL	1223	2-3 Shift Solenoid Valve Control
C	PPL	1228	Pressure Control (PC) Solenoid Valve High Control
D	LT BLU	1229	PC Solenoid Valve Low Control
E	RED	839	Ignition 1 Voltage
F-K	-	-	Not Used
L	BRN	1227	Transmission Fluid Temperature (TFT) Sensor Signal
M	GRY	452	Low Reference
N	PNK	1224	TFP Switch Signal A
P	ORN	1226	TFP Switch Signal C
R	DK BLU	1225	TFP Switch Signal B
S	WHT	687	3-2 Shift Solenoid Valve Assembly Control
T	BLK	422	Torque Converter Clutch Solenoid Valve Control
U	TAN	418	Torque Converter Clutch Pulse Width Modulation Solenoid Valve Control
V-W	-	-	Not Used

AT Inline 20-way Connector, Engine Side Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12160493 20-way F Micro-Pack 100W Series (GRY)
Pin	Wire Color	Circuit No.	Function
A	LT GRN	1222	1-2 Shift Solenoid Valve Control
B	YEL/BLK	1223	2-3 Shift Solenoid Valve Control
C	RED/BLK	1228	Pressure Control (PC) Solenoid Valve High Control
D	LT BLU/WHT	1229	PC Solenoid Valve Low Control
E	PNK	339	Ignition 1 Voltage
F-K	-	-	Not Used
L	YEL/BLK	1227	Transmission Fluid Temperature (TFT) Sensor Signal
M	ORN/BLK	1057	Low Reference
N	PNK	1224	TFP Switch Signal A
P	RED	1226	TFP Switch Signal C
R	DK BLU	1225	TFP Switch Signal B
S	WHT	687	3-2 Shift Solenoid Valve Assembly Control
T	TAN/BLK	422	Torque Converter Clutch Solenoid Valve Control
U	BRN	418	Torque Converter Clutch Pulse Width Modulation Solenoid Valve Control
V-W	-	-	Not Used