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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 206 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B1825, B1850, B1860, B2355, B2365, or B2375 >> Circuit/System Testing >> B1850 01, B1850 06, B1860 01 or B1860 06

B1850 01, B1850 06, B1860 01 or B1860 06

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  1. Ignition OFF, disconnect the X2 harness connector at the lumbar adjuster assembly.
  2. Test for less than 2 ohms between the low reference circuit terminal C and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  4. Verify the appropriate scan tool lumbar sensor parameter is less than 1 volt.
    • If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
      • Lumbar vertical position sensor terminal B
      • Lumbar horizontal position sensor terminal D
  5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal A. Verify the appropriate scan tool lumbar sensor parameter is greater than 4.75 volts.
    • Lumbar vertical position sensor terminal B
    • Lumbar horizontal position sensor terminal D
    • If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  6. If all circuits test normal, test or replace the lumbar position sensor.
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