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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Power Seat System) >> Diagnostic Information and Procedures >> DTC B1825, B1850, B1860, B2105, B2355, B2365, or B2375 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

B1825 01, or B1825 06

  1. Ignition OFF, disconnect the X2 harness connector at the driver seat recline motor.
  2. Test for less than 2 ohms between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, 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 1 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 scan tool Driver Seat Recline Sensor parameter is less than 1 volt.
    • If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 1. Verify the scan tool Driver Seat Recline Sensor parameter is greater than 4.75 volts.
    • 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 seat recline position sensor.

B2355 01, B2355 06, B2365 01, B2365 06, B2375 01, or B2375 06

  1. Ignition OFF, disconnect the X2 harness connector at the driver seat adjuster motor assembly.
  2. Test for less than 2 ohms between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, 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 6 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 driver seat sensor parameter listed below is less than 1 volt.
    • Driver Seat Front Vertical Sensor
    • Driver Seat Rear Vertical Sensor
    • Driver Seat Horizontal Sensor
    • 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.
      • Seat front vertical position sensor terminal 1
      • Seat rear vertical position sensor terminal 5
      • Seat horizontal position sensor terminal 3
  5. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 6 and the appropriate signal circuit listed below:
    • Seat front vertical position sensor terminal 1
    • Seat rear vertical position sensor terminal 5
    • Seat horizontal position sensor terminal 3
  6. Verify the appropriate scan tool driver seat position sensor parameter listed below is greater than 4.75 volts:
    • Driver Seat Front Vertical Sensor
    • Driver Seat Rear Vertical Sensor
    • Driver Seat Horizontal Sensor
    • If less than the specified value, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  7. If all circuits test normal, test or replace the seat adjuster motor assembly.

B1850 01, B1850 05, B1860 01, B1860 05, B2105 01, or B2105 05

  1. Ignition OFF, disconnect the harness connector at the appropriate seat lumbar motor position sensor.
  2. Test for less than 2 ohms between the appropriate low reference circuit listed below and ground:
    • Driver seat lumbar vertical sensor terminal 1
    • Driver seat lumbar horizontal sensor terminal 3
    • Passenger seat lumbar vertical sensor terminal A X353
    • If greater than the specified range, 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 appropriate 5-volt reference circuit listed below and ground:
    • Driver seat lumbar vertical sensor terminal 3
    • Driver seat lumbar horizontal sensor terminal 1
    • Passenger seat lumbar vertical sensor terminal C X353
    • 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 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 Seat 1 Info or Seat 2 Info lumbar sensor parameter listed below is less than 1 volt:
    • Lumbar Horizontal Sensor
    • Lumbar Vertical Sensor
    • 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.
      • Driver seat lumbar vertical sensor terminal 2
      • Driver seat lumbar horizontal sensor terminal 2
      • Passenger seat lumbar vertical sensor terminal B X353
  5. Install a 3A fused jumper wire between the appropriate signal circuit and the 5-volt reference circuit listed below:
    • Driver seat lumbar vertical sensor terminal 2 and terminal 3
    • Driver seat lumbar horizontal sensor terminal 2 and terminal 1
    • Passenger seat lumbar vertical sensor terminal B X353 and terminal C X353
  6. Verify the appropriate scan tool Seat 1 Info or Seat 2 Info lumbar sensor parameter listed below is greater than 4.75 volts:
    • Lumbar Horizontal Sensor
    • Lumbar Vertical Sensor
    • 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.
  7. If all circuits test normal, test or replace the lumbar motor assembly.
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