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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 >> Rear Seat Heater Switch Indicator Malfunction >> 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.

Rear Heated Seat Switch Indicators Inoperative

  1. Ignition OFF, disconnect the harness connector at the heated seat switch.
  2. Ignition ON, verify that a test lamp illuminates between the supply voltage circuit terminal K and ground.
    • If the test lamp does not illuminate, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the body control module (BCM).
  3. Ignition OFF, connect the harness connector to the heated seat switch.
  4. Disconnect the appropriate harness connector (C3 or C4) at the rear heated seat module.
  5. Ignition ON, connect a test lamp between the inoperative heated seat switch indicator control circuit and ground. The indicator should illuminate.
    • If the indicator does not illuminate, test the indicator control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the heated seat switch.
  6. If all circuits test normal, replace the heated seat module.

Heated Seat Switch Indicators Always On

  1. Ignition OFF, disconnect the (C3, C4) harness connector at the rear heated seat module.
  2. Ignition ON, the heated seat switch mode indicators should not be illuminated.
    • If illuminated, test the control circuit of the illuminated indicator for a short to ground. If the circuit tests normal, test or replace the heated seat switch.
  3. If all circuits test normal, replace the rear heated seat module.
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