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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 B2508 or B2509 >> 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.
  1. Ignition OFF, disconnect the (C1) harness connector at the rear heated seat module.
  2. Test for infinite resistance between the left seat heating element supply voltage circuit terminal 3 and ground.
    • If less than infinite resistance, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
  3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 3 and ground.
    • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
  4. Test for infinite resistance between the right seat heating element supply voltage circuit terminal 6 and ground.
    • If less than infinite resistance, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
  5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.
    • If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
  6. If all circuits test normal, replace the heated seat module.
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