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 MANUALSGMC1995C3500 HD 6.5 F, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 75 (GENERATOR & REGULATOR)SELF-DIAGNOSTIC SYSTEMDRB TEST FUNCTIONSNOTES
1995 GMC C3500 HD 6.5 F, Automatic
DRB Test Functions: Notes
1995 GMC C3500 HD 6.5 F, AutomaticSECTION Notes
WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
DO NOT
touch DRB keypad during DRB power-up sequence, or an ERROR message will result.
- To access trouble code descriptions, and perform diagnostic tests using DRB, DRB must be in the CHARGING MENU display. To reach CHARGING MENU, turn ignition off. Connect DRB to Data Link Connector (DLC). DLC is located under center of dash, right of steering column.
- Turn ignition switch to RUN position. All DRB character positions will illuminate and copyright information will appear on screen for several seconds. If DRB screen is blank or any error messages appear, refer to DRB PROBLEMS & ERROR MESSAGES under SELF-DIAGNOSTIC SYSTEM.
- After several seconds DRB menu will appear. At DRB menu, press "4" (SELECT SYSTEM) key. Press ENTER key. At SELECT SYSTEM menu, press "1" (ENGINE) key. Press ENTER key. DRB menu will appear, indicating engine year and size, type of transmission and PCM part number.
- After several seconds AIR COND menu will appear. Press "1" (WITH A/C) or press "2" (WITHOUT A/C). DRB display will change to ENGINE SYSTEMS menu. At ENGINE SYSTEMS menu, press "2" (CHARGING) key. Press ENTER key.
- Display will change to CHARGING MENU. At CHARGING MENU of engine diagnostic program, specific test functions programmed into DRB can be performed. The following DRB modes can be accessed: READ TROUBLE CODES, STATE DISPLAYS, ACTUATOR TEST and ADJUSTMENTS.
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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.