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.
DTC B2552: Backup Lamps Control Circuit Low (Regal Only): Testing
2000 Buick Century CustomSECTION Testing
- Perform lighting system diagnostic system check. See LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
- Turn ignition off. Connect scan tool to DLC. Turn ignition on, with engine off. While listening to backup lamp relay, use scan tool to command backup lamp relay ON and OFF. If audible clicks are heard at relay signifying that it is turning ON and OFF, go to DIAGNOSTIC AIDS . If audible clicks are not heard at relay signifying that it is turning ON and OFF, go to next step.
- Turn ignition off. Disconnect backup lamp relay. Turn ignition on, with engine off. Using a test light connected to ground, probe backup lamp relay terminal C2 (Orange wire). See appropriate BACK-UP LIGHTS wiring diagram. If test light illuminates, go to next step. If test light does not illuminate, go to step 10 .
- Connect test light between backup lamp relay terminals C2 (Orange wire) and A1 (Dark Blue wire). Using scan tool, command backup lamp relay ON and OFF. If test light illuminates each time relay is turned ON and OFF, go to step 8 . If test light does not illuminate each time relay is turned ON and OFF, go to next step.
- If test light stays illuminated each time relay is turned ON and OFF in above step, go to step 7 . If test light does not stay illuminated each time relay is turned ON and OFF in above step, go to next step.
- Test Dark Blue wire between backup lamp relay terminal A1 and BCM harness connector C3 terminal A8 for short to voltage or an open. See WIRING DIAGRAMS . After repair, go to step 13 . If fault is not located and condition still exists, go to step 9 .
- Test Dark Blue wire between backup lamp relay terminal A1 and BCM harness connector C3 terminal A8 for short to ground. See WIRING DIAGRAMS . After repair, go to step 13 . If fault is not located and condition still exists, go to step 9 .
- Inspect for poor connections at backup lamp relay. After repair, go to step 13 . If fault is not located and condition still exists, go to step 11 .
- Inspect for poor connections at BCM harness connector C3. After repair, go to step 13 . If fault is not located and condition still exists, go to step 12 .
- Repair Orange wire between backup lamp relay terminal C2 and underhood accessory wiring junction block. See appropriate BACK-UP LIGHTS wiring diagram. After repair, go to step 13 .
- Replace backup lamp relay. After replacement, go to step 13 .
- Replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. After replacement, perform set up procedure. See NEW BCM SETUP under PROGRAMMING. After replacement, go to next step.
- Using scan tool, clear BCM DTCs. Operate vehicle within conditions to set DTC. If DTC B2552 resets, return to step 2 . If DTC B2552 does not reset, system is okay.
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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.