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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B19A4, B19A8, B103D, or B272E >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 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 seat back and seat cushion ventilation heat and cool modules.
  2. Test for less than 1 ohm between the seat back blower low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
  3. Connect a test lamp between the seat back blower control circuit terminal 2 and ground.
  4. 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 is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open high resistance. If the circuit tests normal, replace the CCSM.
  5. Connect a test lamp between the seat back blower control circuit terminal 7 and ground.
  6. 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 is always ON, test the control circuit for a short to voltage. If the circuits test normal, replace the CCSM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the CCSM.
  7. Connect the harness connector at the seat back ventilation heat and cool module.
  8. Ignition ON, command the Driver Seat Blower Cmd. ON and OFF with a scan tool. The seat back blower should turn ON an OFF when changing between the commanded states.
    • If the blower is always OFF, test or replace the seat back ventilation heat and cool module.
  9. Connect the harness connector at the seat cushion ventilation heat and cool module.
  10. Ignition ON, command the Driver Seat Blower Cmd. ON and OFF with a scan tool. The seat cushion blower should turn ON an OFF when changing between the commanded states.
    • If the blower is always OFF, test or replace the seat cushion ventilation heat and cool module.
  11. If all circuits test normal, replace the CCSM.
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