Transmission Control Module Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		88956573 Conn 42F Module 1 Socket Housing
Pin	Wire Color	Circuit No.	Function
1	YE	400	Output Speed Sensor (OSS) High Signal
2	PU	401	Output Speed Sensor (OSS) Low Signal
3	OG/BK	1228	PC Solenoid Valve High Control (HSD1)
4	BN	418	TCC Solenoid Valve Control
5	YE	43	Accessory Voltage
6	BK/WH	451	Ground
7	-	-	Not Used
8	OG	1525	Solenoid Supply Voltage (HSD2)
9	PK	1239	Ignition 1 Voltage
10	OG/BK	1230	Automatic Transmission ISS High Signal
11	D-BU /WH	1231	Automatic Transmission ISS Low Signal
12-13	-	-	Not Used
14	PU	5526	TAP Up/TAP Down Switch Signal
15	YE/BK	1227	TFT Sensor Signal
16-17	-	-	Not Used
18	YE/BK	1223	2-3 Shift Solenoid Valve Control
19	PU	898	4-5 Shift Solenoid Valve Control
20	TN/BK	2500	High Speed GMLAN Serial Data Bus +
21	TN	2501	High Speed GMLAN Serial Data Bus -
22-23	-	-	Not Used
24	YE	772	Transmission Range Signal B
25	GY	773	Transmission Range Signal C
26	TN	2762	TFT Sensor Low Reference
27	RD/WH	2440	Battery Positive Voltage
28	-	-	Not Used
29	L-BU /WHT	1229	PC Solenoid Valve Low Control
30	L-GN	1222	1-2 Shift Solenoid Valve Control
31	-	-	Not Used
32	TN/BK	2500	High Speed GMLAN Serial Data Bus + (CAN)
33	TN	2501	High Speed GMLAN Serial Data Bus - (CAN)
34-35	-	-	Not Used
36	TN/WH	771	Transmission Range Signal A
37	WH	776	Transmission Range Signal P
38	WH	17	TCC Brake Switch Signal
39-42	-	-	Not Used