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 MANUALSBUICK1998REGAL 25TH ANNIVERSARY EDITIONREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY CONTROL MODULEDIAGNOSTIC TESTSDATA LINK CONNECTOR (DLC) DIAGNOSTIC SYSTEM CHECKTESTING
1998 Buick Regal 25th Anniversary Edition
Data Link Connector (DLC) Diagnostic System Check: Testing
1998 Buick Regal 25th Anniversary EditionSECTION Testing
- Turn ignition switch to LOCK position. Connect scan tool. Turn on scan tool. If scan tool turns on, go to next step. If scan tool does not turn on, diagnose and repair problem in DLC power or ground circuit.
- Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with Powertrain Control Module (PCM). If communication can be established with PCM, go to next step. If communication cannot be established with PCM, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE .
- Attempt to establish communication with Electronic Brake Traction Control Module (EBTCM). If communication can be established with EBTCM, go to next step. If communication cannot be established with EBTCM, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE .
- Attempt to establish communication with Instrument Panel Cluster (IPC). If communication can be established with IPC, go to next step. If communication cannot be established with IPC, see procedures in SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE .
- If vehicle is not equipped with automatic climate control, go to next step. If vehicle is equipped with automatic climate control, attempt to establish communication with A/C-heater control. If communication can be established with A/C-heater control, go to next step. If communication cannot be established with A/C-heater control, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE .
- Attempt to establish communication with Body Control Module (BCM). If communication can be established with BCM, go to next step. If communication cannot be established with BCM, see procedures in SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DATA LINE .
- Attempt to establish communication with Sensing and Diagnostic Module (SDM). If communication can be established with SDM, go to next step. If communication cannot be established with SDM, diagnose and repair problem between DLC and SDM. See DATA LINK CONNECTOR in WIRING DIAGRAMS . See AIR BAG RESTRAINT SYSTEM article.
- Attempt to establish communication with CD player (if equipped) and radio. If communication can be established with CD player and radio, system is operating properly. If communication cannot be established with CD player or radio, diagnose and repair problem between DLC and radio (E & C serial data line). See DATA LINK CONNECTORS in WIRING DIAGRAMS .
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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.