Automatic Transmission Inline 20-Way Connector End View

Engine Side

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191511 20-Way F Micro-Pack 100W Series (GY)
Pin	Wire Color	Circuit No.	Function
A	L-GN	1222	1-2 Shift Solenoid Valve Control
B	YE/BK	1223	2-3 Shift Solenoid Valve Control
C	RD/BK	1228	PC Solenoid Valve High Control
D	L-BU/WH	1229	PC Solenoid Valve Low Control
E	PK	1020	Ignition Voltage (4.2L)
	PK	139	Ignition Voltage (5.3L)
F-K	-	-	Not Used
L	YE/BK	1227	TFT Sensor Signal
M	BK	2762	Low Reference
N	PK	1224	Transmission Fluid Pressure Switch Signal A
P	RD	1226	Transmission Fluid Pressure Switch Signal C
R	D-BU	1225	Transmission Fluid Pressure Switch Signal B
S	WH	687	3-2 Shift Solenoid Valve Control
T	TN/BK	422	TCC Solenoid Valve Control
U	BN	418	TCC PWM Solenoid Valve Control
V-W	-	-	Not Used

Transmission Side

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12160782 20-Way M Micro-Pack 100W Series (GY)
Pin	Wire Color	Circuit No.	Function
A	L-GN	1222	1-2 Shift Solenoid Valve Control
B	YE	1223	2-3 Shift Solenoid Valve Control
C	PU	1228	PC Solenoid Valve High Control
D	L-BU	1229	PC Solenoid Valve Low Control
E	RD	839	Ignition 1 Voltage
E	PK	1020	Ignition Voltage (4.2L)
	PK	139	Ignition Voltage (5.3L)
F-K	-	-	Not Used
L	BN	1227	TFT Sensor Signal
M	GY	452	Low Reference
N	PK	1224	Transmission Fluid Pressure Switch Signal A
P	OG	1226	Transmission Fluid Pressure Switch Signal C
R	D-BU	1225	Transmission Fluid Pressure Switch Signal B
S	WH	687	3-2 Shift Solenoid Valve Control
T	BK	422	TCC Solenoid Valve Control
U	TN	418	TCC PWM Solenoid Valve Control
V-W	-	-	Not Used