2007 Chevrolet Uplander Base, 3.9 WFACTORY OEM SERVICE PROCEDURE

Transmission Control Module (TCM) Connector End View, Engine Side

Fig 1: Transmission Control Module Connector End View
GM1372727Courtesy of GENERAL MOTORS CORP.
Connector Part Information

Connector Part Information 
  • OEM: 15463921
  • Service: 88987979
  • Description: 49-Way F Micro-64 GT 280 Series Sealed (BK)
Terminal Part Information 
  • Terminal/Tray: 15356826
  • Core/Insulation Crimp: C
  • Release Tool/Test Probe: See Terminal Repair Kit
Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 TN/BK 422 Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve Control
2 L-GN 1222 1-2 Shift Solenoid (SS) Valve Control
3 OG/BK 1230 Input Speed Sensor (ISS) High Signal
4 - - Not Used
5 BN/WH 6354 Output Speed Sensor (OSS) High Signal
6 TN 2501 High Speed GMLAN Serial Data Bus
7 TN/BK 2500 High Speed GMLAN Serial Data Bus
8 - - Not Used
9 YE 657 TCC Release Switch Signal
10 - - Not Used
11 BN 1141 Ignition 3 Voltage
12-15 - - Not Used
16 PU 401 VSS Low Signal
17 L-BU/WH 1229 Pressure Control (PC) Solenoid Valve Low Control
18-19 - - Not Used
20 YE/BK 1223 2-3 Shift Solenoid (SS) Valve Control
21-22 - - Not Used
23 GY 773 Transmission Range Signal C
24-25 - - Not Used
26 D-BU/WH 1231 ISS Low Signal
27-28 - - Not Used
29 TN/WH 771 Transmission Range Signal A
30 BK 452 Low Reference
31 PK 439 Ignition 1 Voltage
32 RD/WH 540 Battery Positive Voltage
33-34 - - Not Used
35 YE/BK 1227 TFT Sensor Signal
36 - - Not Used
37 TN 2501 High Speed GMLAN Serial Data Bus
38 TN/BK 2500 High Speed GMLAN Serial Data Bus
39 WH 776 Transmission Range Signal P
40 OG/BK 1228 PC Solenoid Valve High Control
41 YE 400 VSS High Signal
42 L-GN 526 Stop Lamp Supply Voltage
43-45 - - Not Used
46 YE 772 Transmission Range Signal B
47-48 - - Not Used
49 BK/WH 1451 Ground
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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