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)DIAGNOSTIC TESTSDTC B2602: DAYTIME RUNNING LIGHT (DRL) RELAY OUTPUT SHORT TO GROUND OR OPENTESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC B2602: Daytime Running Light (DRL) Relay Output Short To Ground Or Open: Testing
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Testing
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.
NOTE:
If circuit is shorted to ground, fuse will blow. Check fuse before performing diagnostics.
- Perform BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS. Go to next step.
- Replace DRL relay with a known-good relay. Using scan tool, activate DRL relay. If DRL relay activates, go to step 10 . If DRL relay does not activate, go to next step.
- With original DRL relay in underhood junction block, disconnect underhood junction block connector C3. Using DVOM, measure voltage between underhood junction block connector C3 terminal B12 (Light Green/Black wire) and ground. See WIRING DIAGRAMS . If battery voltage is indicated, go to step 5 . If battery voltage is not indicated, go to next step.
- Replace underhood junction block. After repairs, go to step 10 .
- Disconnect BCM connector C1. Using DVOM, measure resistance between BCM connector C1 terminal B5 (Light Green/Black wire) and ground. See Figure . If no resistance is indicated (infinite), go to step 7 . If any resistance is indicated, go to next step.
- Repair short to ground in Light Green/Black wire between BCM and underhood junction block. After repairs, go to step 10 .
- Using DVOM, measure resistance between BCM connector C1 terminal B5 and underhood junction block connector C3 terminal B12 (Light Green/Black wire). If reading is less than 2 ohms, go to step 9 . If reading is greater than 2 ohms, go to next step.
- Repair open in Light Green/Black wire between BCM and underhood junction block. After repairs, go to step 10 .
- Replace BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION. After repairs, go to next step.
- Using scan tool, clear DTCs. Go to BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.
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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.