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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B1AA0, B1AA1, or B2730 >> 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.

B1AA0 - Seat Cushion Temperature Sensor Test

  1. Ignition OFF, disconnect the X2 harness connector at the CCSM.
    2. IMPORTANT: If the resistance is measured with the seat still warm or cool, the resistance values will vary. At 68°F (20°C), the nominal resistance value is 1200 ohms ±5 percent. For warmer or cooler ambient temperatures, refer to the Temperature vs Resistance  table below. The delta resistance values between the seat cushion and seat back temperature sensors should not be greater than 2000 ohms.
  2. Test for 300 ohms-18K ohms between the signal circuit terminal 7 and the low reference circuit terminal 8.
    • If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the seat cushion ventilation heat and cool module.
    • If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the seat cushion ventilation heat and cool module.
  3. Connect the X2 harness connector at the CCSM.
  4. Disconnect the harness connector at the seat cushion ventilation heat and cool module.
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 5 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuits tests normal, replace the CCSM.
  6. If all circuits test normal, replace the CCSM.

B1AA1, B2730 - Seat Back Temperature Sensor and Blower Test

  1. Ignition OFF, disconnect the X2 harness connector at the CCSM.
    2. IMPORTANT: If the resistance is measured with the seat still warm or cool, the resistance values will vary. At 68°F (20°C), the nominal resistance value is 1200 ohms ±5 percent. For warmer or cooler ambient temperatures, refer to the Temperature vs Resistance  table below. The delta resistance values between the seat cushion and seat back temperature sensors should not be greater than 2000 ohms.
  2. Test for 300 ohms-18K ohms between the signal circuit terminal 9 and the low reference circuit terminal 10.
    • If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the seat cushion ventilation heat and cool module.
    • If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the seat cushion ventilation heat and cool module.
  3. Connect the X2 harness connector at the CCSM.
  4. Disconnect the harness connector at the seat back ventilation heat and cool module.
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 5 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuits tests normal, replace the CCSM.
  6. Connect a test lamp between the control circuit terminal 2 and ground.
  7. Ignition ON, command the Driver Seat Blower Cmd. ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the CCSM.
  8. Connect a test lamp between the control circuit terminal 7 and ground.
  9. Ignition ON, command the Driver Seat Blower Cmd. ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the CCSM.
  10. If all circuits test normal, test or replace the seat back ventilation heat and cool module.
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