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 MANUALSCHEVROLET2019TRAX PREMIER, AWDREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESPOWER WINDOWS MALFUNCTIONCIRCUIT/SYSTEM DESCRIPTION
2019 Chevrolet Trax Premier, AWD
Circuit/System Description
2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Description
For an overview of the component/system, refer to: Power Windows Description and Operation
| Circuit | Description |
|---|---|
| B+ - M74D Window Motor - Driver | Supplied from a fuse. |
| B+ - M74P Window Motor - Passenger | Supplied from a fuse. |
| B+ - S79LR Window Switch - Left Rear | Supplied from a fuse. |
| B+ - S79RR Window Switch - Right Rear | Supplied from a fuse. |
| Signal - Down @ M74D Window Motor - Driver | The output circuit is switched to ground to activate the component. |
| Signal - Up @ M74D Window Motor - Driver | The output circuit is switched to ground to activate the component. |
| Signal - Express @ M74D Window Motor - Driver | The output circuit is switched to ground to activate the component. |
| Control - Up @ M74P Window Motor - Passenger | The output circuit is switched from ground to 12 V to activate the component. |
| Control - Down @ M74P Window Motor - Passenger | The output circuit is switched from ground to 12 V to activate the component. |
| Control - Up @ M74LR Window Motor - Left Rear | The output circuit is switched from ground to 12 V to activate the component. |
| Control - Down @ M74LR Window Motor - Left Rear | The output circuit is switched from ground to 12 V to activate the component. |
| Control - Up @ M74RR Window Motor - Right Rear | The output circuit is switched from ground to 12 V to activate the component. |
| Control - Down @ M74RR Window Motor - Right Rear | The output circuit is switched from ground to 12 V to activate the component. |
| Ground | Chassis Ground |
| Component | Description |
|---|---|
| S79D Window Switch - Driver | The S79D sends a serial data message to the K9 indicating the M74 function that has been requested. |
| M74 Window Motor | The motor M74 is a bidirectional DC motor that moves the component: Front Power Windows & Rear Power Windows |
| S79P Window Switch - Passenger | The switch has a normally open contact. |
| S79LR Window Switch - Left Rear | The switch has a normally open contact. |
| S79RR Window Switch - Right Rear | The switch has a normally open contact. |
| K9 Body Control Module | The module controls various vehicle functions like lighting, central door locking, power windows, etc. |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.