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.
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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 820 (THEFT DETERRENT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Scan Tool Output Controls
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM) Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection (s) | Description |
|---|---|---|
| DRL Parklamps | Special Functions, Output Control, Light Test | The body control module (BCM) actuates the daytime running lamp parklamp relay when commanded ON with the scan tool soft key. The parklamps will illuminate until commanded OFF with the scan tool soft key. |
| Horn | Special Functions, Output Control, Miscellaneous Test | The body control module (BCM) actuates the horn relay when commanded ON with the scan tool soft key. The horn will sound for 5 seconds. |
| Backup Lamps | Special Functions, Output Control, Light Test | The body control module (BCM) actuates the backup lamps relay when commanded ON with the scan tool soft key. The backup lamps will illuminate until commanded OFF with the scan tool soft key. |
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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.