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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 B2425 or B2430 >> 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.

B2425 Left Rear Heated Seat Cushion

  1. Ignition OFF, disconnect the (C1) harness connector at the rear heated seat module.
  2. Test for less than 13.2 ohms of resistance between the seat cushion supply voltage terminal 3 and the control circuit terminal 5.
    • If greater than 13.2 ohms, test the supply voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the seat cushion heating element.
  3. Ignition OFF, disconnect the (C2, C4) harness connectors at the rear heated seat module.
  4. Test for 2.1K-300K ohms of resistance between the seat cushion temperature sensor signal circuit terminal 9 (C4) and the low reference circuit terminal 6 (C2).
    • If greater than 300K ohms, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion temperature sensor.
    • If less than 2.1K ohms, replace the seat cushion temperature sensor.
  5. Ignition OFF, connect the (C1, C2, C4) harness connectors at the heated seat module.
  6. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
  7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C and ground.
    • If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear heated seat module.
    • If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the rear heated seat module.
  8. If all circuits test normal, replace the rear heated seat module.

B2430 Right Rear Heated Seat Cushion

  1. Ignition OFF, disconnect the (C1) harness connector at the rear heated seat module.
  2. Test for less than 13.2 ohms of resistance between the seat cushion supply voltage circuit terminal 6 and the control circuit terminal 2.
    • If greater than 13.2 ohms, test the supply voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the seat cushion heating element.
  3. Ignition OFF, disconnect the (C2, C4) harness connectors at the rear heated seat module.
  4. Test for 2.1K-300K ohms of resistance between the seat cushion temperature sensor signal circuit terminal 20 (C4) and the low reference circuit terminal 8 (C2)
    • If greater than 300K ohms, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion temperature sensor.
    • If less than 2.1K ohms, replace the seat cushion temperature sensor.
  5. Ignition OFF, connect the (C1, C2, C4) harness connectors at the heated seat module.
  6. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
  7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C and ground.
    • If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear heated seat module.
    • If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the rear heated seat module.
  8. If all circuits test normal, replace the rear heated seat module.
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