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 B2119: LUMBAR FORWARD/AFT POSITION SENSOR FAILEDTESTING
2000 Buick Park Avenue Base, 3.8 K
DTC B2119: Lumbar Forward/Aft Position Sensor 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.
- Disconnect lumbar forward/aft position sensor (located in seat back). Measure voltage between lumbar forward/aft position sensor harness connector ground circuit terminal (Orange wire) and 5-volt supply circuit terminal (Light Blue wire). If 4.5-5.2 volts exists, go to next step. If 4.5-5.2 volts does not exist, go to step 4 .
- Check for short to ground, high resistance or open in lumbar forward/aft position sensor return circuit (Black wire) between lumbar forward/aft position sensor and MSM. Repair as necessary. See WIRING DIAGRAMS . After repair, go to step 10 . If lumbar forward/aft position sensor return circuit is okay, go to next step.
- Check for high resistance or open in 5-volt reference circuit (Gray wire) between lumbar forward/aft position sensor and MSM. Repair as necessary. See WIRING DIAGRAMS . After repair, go to step 10 . If 5-volt reference circuit is okay, go to next step.
- Check for high resistance or open in lumbar forward/aft position sensor return circuit (Black wire) between lumbar forward/aft position sensor and MSM. Repair as necessary. See WIRING DIAGRAMS . After repair, go to step 10 . If lumbar forward/aft position sensor return circuit is okay, go to step 7 .
- Check for poor terminal contact at lumbar forward/aft position sensor 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 MSM harness connector. Repair as necessary. After repair, go to step 10 . If terminal contact is okay, go to step 9 .
- Replace lumbar forward/aft position sensor. See POSITION SENSORS under REMOVAL & INSTALLATION. After repair, go to step 10 .
- Replace MSM. See MEMORY SEAT MODULE 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.