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.
Theory Of Operation
The Security Gateway Module (SGW) provides security against certain types of attacks and threats from the scan tool and entertainment CAN Bus to the rest of vehicle's CAN Bus Modules. The SGW lies electrically between the vehicle modules on one side, Data Link Connector (DLC) and entertainment system modules on the other side. The main function of the SGW is to gate messages from one CAN Bus system to another. The SGW monitors the Fused B+, CAN Bus performance related faults, software and hardware for any concerns. The SGW does NOT monitor the CAN C Diagnostic or CAN IHS Diagnostic circuits for concerns.
Successful communication with the vehicle is established thru the CAN C Diagnostic (+) and CAN C Diagnostic (-) circuits with the Diagnostic Scan Tool from the SGW.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.