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 80 (BODY CONTROL MODULES)SELF-DIAGNOSTIC SYSTEMHORNS SYSTEM DIAGNOSTIC SYSTEM CHECK
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Horns System Diagnostic System Check
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Horns System Diagnostic System Check
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use this check as starting point for any horns system complaint.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition switch to RUN position. Using scan tool, attempt to establish communications with Body Control Module (BCM). If communication is established, go to next step. If communication cannot be established, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Select BCM DTCS function on scan tool. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, perform appropriate symptom test. See SYSTEM TESTS in appropriate STEERING COLUMN SWITCHES article.
- Using scan tool, retrieve DTCs. If DTCs U1000-U1305 are not present, go to next step. If DTCs U1000-U1305 are present, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Check for DTCs B1000 or B1004. If DTCs are not present, go to next step. If any DTC is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
- Check for DTCs B1339 or B1349. If DTCs are not present, go to next step. If any DTC is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
- Check for DTCs B1482, B1483, B1507 or B1508. If DTCs are not present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary. If any DTC is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
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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.