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 636 (RETAINED ACCESSORY POWER SYSTEM)
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Section 636 (Retained Accessory Power System)
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Section 636 (Retained Accessory Power System)
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.
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Retained Accessory Power
- Diagnostic System Check - Retained Accessory Power
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B1477: Retained Accessory Power Circuit Low
- DTC B1478: Retained Accessory Power Circuit High
- Symptoms - Retained Accessory Power
- Retained Accessory Power (RAP) On After Timeout
- Retained Accessory Power (RAP) Inoperative
- Description and Operation
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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.