Transmission Control Module (TCM) (M30 or M70)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Transmission Control Module (TCM) (M30 or M70) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire Color	Circuit	Function
1	0.5 BN	418	TCC PWM Solenoid Valve Control
2	0.5 L-GN	1222	1-2 Shift Solenoid Valve Control
3	0.35 OG	1983	Input Shaft Speed (ISS) Signal
4	-	-	Not Used
5	0.35 OG/BK	6399	Replicated TOS Signal
6	0.5 TN	2501	High Speed GMLAN Serial Data Bus -
7	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus +
8-10	-	-	Not Used
11	0.35 D-BU	5985	Accessory Wake Up Serial Data
12-13	-	-	Not Used
14	0.5 WH	687	3-2 Shift Solenoid Valve Control
15	-	-	Not Used
16	0.5 L-GN/BK	822	VSS High Signal
17	0.5 L-BU/WH	1229	PC Solenoid Valve Low Control
18-19	-	-	Not Used
20	0.5 YE/BK	1223	2-3 Shift Solenoid Valve Control
21-22	-	-	Not Used
23	0.35 GY	773	Transmission Range Switch Signal C
24	0.35 PK	1224	Transmission Fluid Pressure Switch Signal A
25	0.5 TN/BK	422	TCC Solenoid Valve Control
26-28	-	-	Not Used
29	0.35 TN/WH	771	Transmission Range Switch Signal A
30	0.35 TN	2762	Low Reference
31	0.5 PK	2139	Ignition Voltage
32	0.5 RD/WH	1840	Battery Positive Voltage
33	0.35 OG	1226	Transmission Fluid Pressure Switch Signal C
34	-	-	Not Used
35	0.5 YE/BK	1227	Transmission Fluid Temperature (TFT) Sensor Signal
36	-	-	Not Used
37	0.5 TN	2501	High Speed GMLAN Serial Data Bus -
38	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus +
39	0.35 WH	776	Transmission Range Switch Signal P
40	0.5 OG/BK	1228	Pressure Control (PC) Solenoid Valve High Control
41	0.5 PU/WH	821	VSS Low Signal
42	0.5 L-BU/WH	6311	Brake Switch Signal
43	-	-	Not Used
44	0.35 D-BU	1225	Transmission Fluid Pressure Switch Signal B
45	0.35 L-BU	1984	Low Reference
46	0.35 YE	772	Transmission Range Switch Signal B
47-48	-	-	Not Used
49	0.8 BK/WH	451	Ground

Connector Part Information

OEM: 15463921
Service: 89046898
Description: Conn 49-Way F Micro-64 GT 280 Series Sealed (BK)

Terminal Part Information

Terminal/Tray: 15304719/19
Core/Insulation Crimp: Pins: 1-3, 5-7, 11, 14, 16, 17, 20, 23-25, 29-33, 35, 37-42, 44-46: E/5
Core/Insulation Crimp: Pins: 49: 2/5
Release Tool/Test Probe: 15315247/J-35616-4A (PU)