Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSCOMPONENT CONNECTOR END VIEWS (K71-M81)COMPONENT CONNECTOR END VIEWSK71 TRANSMISSION CONTROL MODULE (MRG)
2025 Chevrolet Trailblazer ACTIV, FWD
K71 Transmission Control Module (MRG)
2025 Chevrolet Trailblazer ACTIV, FWDSECTION K71 Transmission Control Module (MRG)
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool |
|---|---|---|---|
| I | 13587518 | J-35616-35 (VT) | J-38125-11A |
| II | 19351723 | J-35616-64B (L-BU) | J-38125-213 |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 - 5 | - | - | - | Not Occupied | - | - |
| 6 | 0.5 | VT / GY | 139 | Run/Crank Ignition 1 Voltage | II | MRG |
| 7 | 0.5 0.5 |
VT / YE VT / YE |
5985 5985 |
Accessory Wake-Up Serial Data Accessory Wake-Up Serial Data |
II II |
LBP+MRG MRG+L3T |
| 8 | 0.5 | GN / YE | 6353 | Input Speed Signal | II | MRG |
| 9 | 0.5 | GY / BU | 6358 | Output Speed Signal | II | MRG |
| 10 - 12 | - | - | - | Not Occupied | - | - |
| 13 | 0.5 | BN / WH | 585 | Transmission Fluid Temperature Sensor Signal | II | MRG |
| 14 | 0.5 | YE / GN | 4170 | Transmission Output Shaft Speed Sensor Circuit 9V Reference | II | MRG |
| 15 | 0.5 | YE / BU | 7763 | Primary Pulley Pressure Sensor Signal | II | MRG |
| 16 | 0.5 | BU / RD | 4162 | Transmission Fluid Pressure Sensor 1 Circuit 5V Reference | II | MRG |
| 17 - 22 | - | - | - | Not Occupied | - | - |
| 23 | 0.5 | YE / BU | 4171 | Transmission Input Shaft Speed Sensor Circuit 9V Reference | II | MRG |
| 24 | 0.5 | GN / VT | 4510 | Transmission Intermediate Speed Signal | II | MRG |
| 25 | 0.5 | BU / WH | 3338 | Transmission Internal Mode Switch Mode Control X | II | MRG |
| 26 | 0.5 | BK / BN | 586 | Transmission Fluid Temperature Sensor Low Reference | II | MRG |
| 27 | - | - | - | Not Occupied | - | - |
| 28 | 0.5 | GY / BU | 4324 | Transmission Auxiliary Fluid Pump Feedback Signal | II | MRG |
| 29 - 30 | - | - | - | Not Occupied | - | - |
| 31 | 0.5 | VT / GY | 7764 | Secondary Pulley Pressure Sensor Signal | II | MRG |
| 32 | - | - | - | Not Occupied | - | - |
| 33 | 0.5 | GN / GY | 6387 | Transmission High Side Driver 1 Control | II | MRG |
| 34 | 0.5 | BU | 2500 | High Speed GMLAN Serial Data [+] 1 | II | MRG |
| 35 | 0.5 0.5 |
BU BU |
2500 2500 |
High Speed GMLAN Serial Data [+] 1 High Speed GMLAN Serial Data [+] 1 |
II II |
LBP+MRG MRG+L3T |
| 36 | 0.5 0.5 |
WH WH |
2501 2501 |
High Speed GMLAN Serial Data [-] 1 High Speed GMLAN Serial Data [-] 1 |
II II |
LBP+MRG MRG+L3T |
| 37 | 0.5 | WH | 2501 | High Speed GMLAN Serial Data [-] 1 | II | MRG |
| 38 | - | - | - | Not Occupied | - | - |
| 39 | 0.5 0.5 |
BU / BK BU / BK |
7493 7493 |
High Speed GMLAN Serial Data [+] 3 High Speed GMLAN Serial Data [+] 3 |
II II |
LBP+MRG MRG+L3T |
| 40 | 0.5 0.5 |
WH WH |
7494 7494 |
High Speed GMLAN Serial Data [-] 3 High Speed GMLAN Serial Data [-] 3 |
II II |
LBP+MRG MRG+L3T |
| 41 | 0.5 | BK / BU | 4165 | Transmission Fluid Pressure Sensor 1 Circuit Low Reference | II | MRG |
| 42 | 0.5 | WH | 7494 | High Speed GMLAN Serial Data [-] 3 | II | MRG |
| 43 | 0.5 | BU / BK | 7493 | High Speed GMLAN Serial Data [+] 3 | II | MRG |
| 44 | 0.5 | GY / GN | 6403 | Clutch Solenoid Valve D Control | II | MRG |
| 45 - 49 | - | - | - | Not Occupied | - | - |
| 50 | 0.5 | GY / BN | 6388 | Transmission High Side Driver 2 Control | II | MRG |
| 51 - 52 | - | - | - | Not Occupied | - | - |
| 53 | 0.5 | GN / WH | 2968 | Transmission Auxiliary Fluid Pump Control | II | MRG |
| 54 | 0.5 | VT / WH | 422 | Torque Converter Clutch Solenoid Valve Control | II | MRG |
| 55 | - | - | - | Not Occupied | - | - |
| 56 | 0.5 | GN / WH | 1530 | Transmission Line Pressure Control Solenoid Valve Control | II | MRG |
| 57 | 0.5 | BN | 6400 | Clutch Solenoid Valve A Control | II | MRG |
| 58 | 0.5 | YE / BN | 6404 | Clutch Solenoid Valve E Control | II | MRG |
| 59 | 0.5 | VT | 4509 | Transmission Clutch F Control | II | MRG |
| 60 - 64 | - | - | - | Not Occupied | - | - |
| 65 | 1.5 1.5 |
BK / WH BK / WH |
251 251 |
Signal Ground Signal Ground |
I I |
LBP+MRG MRG+L3T |
| 66 | 1.5 | RD / YE | 240 | Battery Positive Voltage | I | MRG |
RENDER: 1.0x
NO RELATED
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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.