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 895 (BODY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESON-BOARD DIAGNOSTIC FEATURESOUTPUT TESTING
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Output Testing
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Output Testing
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Make sure the BCM is in self-test and you have retrieved DTCs.
- Turn the IP dimmer switch to the DOME position to begin the first output test.
- Turn the IP dimmer switch from DOME to OFF and back to DOME to step through the 7 tests listed:
- Test 1 - turns OFF all interior lamps
- Test 2 - turns ON the interior lamps
- Test 3 - turns ON all courtesy lamps
- Test 4 - energizes the theft deterrent relay for 1 second and turns ON the headlamps, for BCM Type 4 only
- Test 5 - energizes the horn relay for 25 ms and turns ON the horn, for BCM Type 4 only
- Test 6 - turns ON the theft deterrent indicator lamp, for BCM Type 4 only
- Test 7 - turns OFF the theft deterrent indicator lamp, for BCM Type 4 only
- The BCM sounds the chime to indicate the output test number.
- Once all tests are completed, the cycle will repeat with each DOME-OFF-DOME cycle of the IP dimmer switch.
Remember that the maximum number of output tests for Type 2 and Type 3 BCMs is 3.
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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.