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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 >> Heated Seat Inoperative - Rear >> 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 harness connector at the heated seat switch.
  2. Test for less than 5 ohms of resistance between the heated seat switch ground circuit terminal J and ground.
    • If greater than 5 ohms, repair the ground circuit for an open/high resistance.
  3. Ignition ON, use a scan tool to observe the Rear Heated Seat Module Rear Seat HVC Mode parameter. The reading should be Off.
    • If not Off, test the appropriate signal circuit for a short to ground. If the circuit tests normal, replace the heated seat module.
  4. Install a 3A fused jumper wire between the switch signal circuit terminal G and ground. Verify the Rear Seat HVC Mode parameter is Back and Cushion.
    • If not Back and Cushion, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the heated seat module.
  5. Install a 3A fused jumper wire between the switch signal circuit terminal A and ground. Verify the Rear Seat HVC Mode parameter is Back Only.
    • If not Back Only, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the heated seat module.
  6. If all circuits tests normal, test or replace the heated seat switch.
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