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 609 (LIGHTING SYSTEMS)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 Pontiac Aztek and 2004 Buick Rendezvous. 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 |
|---|---|---|
| Daytime Running Lamps | Light Test | The BCM activates the DRL relay for 5 seconds when you select ON. The daytime running lights illuminate for 5 seconds. |
| Headlamps | Light Test | The BCM activates the headlamp relay when you select ON. The headlamps illuminate until commanded OFF. |
| Park Lamp | Light Test | The BCM activates the park lamp relay when you select ON. The park lamps illuminate until commanded OFF. |
| Front Fog Lamps | Light Test | The BCM activates the FOG LP relay when you select ON. The fog lamps illuminate until commanded OFF. |
| Auxiliary Test | Light Test | The BCM activates the theater dimming outputs for 5 seconds when you select ON. The dome, footwell, and courtesy lamps illuminate for 5 seconds. |
| Inadvertent Power | Inadvertent Power | The BCM activates the inadvertent power relay for 5 seconds. |
RENDER: 1.0x
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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.