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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B1AA2, B1AA3, or B272B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 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 C2 harness connector at the climate control seat module.
  2. Test for 300 ohms-18K ohms of resistance 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 C2 harness connector at the climate control seat module.
  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 climate control seat module.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuits tests normal, replace the climate control seat module.
  6. If all circuits test normal, replace the climate control seat module.

B1AA3, B272B - Seat Back Temperature Sensor and Blower Test

  1. Ignition OFF, disconnect the C2 harness connector at the climate control seat module.
  2. Test for 300 ohms-18K ohms of resistance 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 C2 harness connector at the climate control seat module.
  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 climate control seat module.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuits tests normal, replace the climate control seat module.
  6. Connect a test lamp between the supply voltage 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 supply circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the climate control seat module.
  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 climate control seat module.
  10. If all circuits test normal, test or replace the seat back ventilation heat and cool module.
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