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 MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (BODY CONTROL MODULES)SYSTEM TESTSBCM DIAGNOSTIC SYSTEM CHECK
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
BCM Diagnostic System Check
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION BCM Diagnostic System Check
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
- Connect scan tool to Data Link Connector (DLC). Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL INOPERATIVE .
- Select BODY on scan tool system selection menu. Select BODY FUNCTION CONTROLLER and data. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, go to step 4 .
- Read DTCs with scan tool. If more than one DTC is listed, always select the first DTC listed on scan tool. If scan tool displays any current DTCs, go to BCM DTC DEFINITIONS under SELF-DIAGNOSTIC SYSTEM. If scan tool does not display any current DTCs, go to step 5 .
- Attempt to establish communication with other systems along the class 2 serial data line (PCM, IPC). If scan tool communicates with other systems, go to DTC U1064: LOSS OF COMMUNICATIONS WITH BCM . If scan tool does not communicate with other systems, go to SCAN TOOL CANNOT COMMUNICATE WITH CLASS 2 DEVICE .
- Record any history DTCs. Using scan tool, clear any history DTCs. Cycle ignition off and on. Recheck for current DTCs. If scan tool displays any current DTCs, go to BCM DTC DEFINITIONS under SELF-DIAGNOSTIC SYSTEM. If scan tool does not display any current DTCs, go to next step.
- Check for intermittent conditions. Go to step 1 and perform test while wiggling wires and connectors and tapping on components.
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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.