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 MANUALSBUICK2000PARK AVENUE BASE, 3.8 KREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMESEATSPOWER SEAT SYSTEMDIAGNOSTIC TESTSDTC B2111: LUMBAR DOWN SWITCH FAILEDTESTING
2000 Buick Park Avenue Base, 3.8 K
DTC B2111: Lumbar Down Switch Failed: Testing
2000 Buick Park Avenue Base, 3.8 KSECTION Testing
- Perform POWER SEATS DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. Go to next step.
- Install scan tool to DLC. Turn ignition switch to RUN position. Select and monitor SEAT SWITCHES in MSM data list. If scan tool displays seat switches as idle, go to next step. If scan tool does not display seat switches a idle, go to step 4 .
- Activate lumbar down while observing seat switch parameter. If seat switch parameter changes state, go to step 10 . If seat switch parameter does not change, go to next step.
- Turn ignition switch to LOCK position. Disconnect lumbar switch assembly. Turn ignition switch to RUN position. If scan tool parameter displays seat switches as idle, go to step 7 . If scan tool does not display seat switches as idle, go to next step.
- Check for short to power in lumbar down signal circuit (Yellow/Black wire). Repair as necessary. See WIRING DIAGRAMS . If lumbar down signal circuit is okay, go to next step.
- Check for poor terminal contact at MSM harness connector. Repair as necessary. After repair, go to step 10 . If terminal contact is okay, go to step 8 .
- Check for poor terminal contact at lumbar adjuster switch harness connector. Repair as necessary. After repair, go to step 10 . If terminal contact is okay, go to step 9 .
- Replace MSM. See MEMORY SEAT MODULE under REMOVAL & INSTALLATION. After repair, go to step 10 .
- Replace lumbar switch assembly. See LUMBAR SWITCH ASSEMBLY under REMOVAL & INSTALLATION. After repair, go to next step.
- Using scan tool, clear DTCs. Recheck system operation. If DTC resets, go to step 2 . If no DTCs exist, system is okay at this time.
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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.