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.
1999 GMC EnvoyFACTORY OEM SERVICE PROCEDURE
Programming BCM
NOTE:
Use of Tech 2 scan tool is recommended for programming BCM. A generic scan tool may not be capable of performing all necessary programming functions. Refer to scan tool manufacturer's instructions.
- Ensure battery is fully charged. Turn ignition on. Program BCM using scan tool. Refer to Techline(R) terminal and equipment user's instructions.
- If BCM fails to program, check all connections. Ensure latest software version for scan tool is used. Retry programming BCM. If programming fails again, replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION.
Factory Service Tools
Use the Manual With the Right Hardware
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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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