Transmission Control Module

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

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

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.35 YE	400	OSS High Signal
2	0.35 PU	401	OSS Low Signal
3	0.35 OG/BK	1228	PC Solenoid Valve High Control
4	0.35 BN	418	TCC Solenoid Valve Control
5	0.35 YE/BK	5728	ECM/TCM Serial Data Wake Up
6	0.35 BK/WH	751	Ground (5L40/6L50)
6	1 BK/WH	1551	Ground (5L50)
7	-	-	Not Used
8	0.35 OG	1525	Solenoid Supply Voltage
9	0.35 PK	239	Ignition 1 Voltage
10	0.35 OG/BK	1230	ISS High Signal
11	0.35 D-BU/WH	1231	ISS Low Signal
12-13	-	-	Not Used
14	0.35 PU	5526	Tap Up/Tap Down Signal
15	0.35 YE/BK	1227	TFT Sensor Signal
16-17	-	-	Not Used
18	0.35 YE/BK	1223	2-3 Shift Solenoid Valve Control
19	0.35 PU	898	4-5 Shift Solenoid Valve Control
20	0.35 TN/BK	2500	High Speed GMLAN Serial Data Bus+
21	0.35 TN	2501	High Speed GMLAN Serial Data Bus-
22-23	-	-	Not Used
24	0.35 YE	772	Transmission Range Signal B
25	0.35 GY	773	Transmission Range Signal C
26	0.35 TN	2762	Low Reference
27	0.35 RD/WH	1440	Battery Positive Voltage
28	-	-	Not Used
29	0.35 L-BU/WH	1229	PC Solenoid Valve Low Control
30	0.35 L-GN	1222	1-2 Shift Solenoid Valve Control
31	-	-	Not Used
32	0.35 TN/BK	2500	High Speed GMLAN Serial Data Bus+
33	0.35 TN	2501	High Speed GMLAN Serial Data Bus-
34-35	-	-	Not Used
36	0.35 TN/WH	771	Transmission Range Signal A
37	0.35 WH	776	Transmission Range Signal P
38	0.35 WH	17	TCC Brake Switch Signal
39-42	-	-	Not Used

Connector Part Information

OEM: 88956573
Service: See Catalog
Description: 42-Way F Module 1 Socket Housing (BK)

Terminal Part Information

Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit