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Circuit/System Testing

Automatic HVAC

  1. Ignition OFF, disconnect the X1 connector at the X50A Fuse Block - Underhood.
  2. Connect a test lamp between the control circuit terminal 35 X1 and ground.
  3. Ignition ON, command the Rear Defog Relay 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 K33 HVAC Control Module.
    • 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 K33 HVAC Control Module.
  4. If all circuits test normal, test or replace the X50A Fuse Block - Underhood.

Manual HVAC

  1. Ignition OFF, disconnect the X1 connector at the X50A Fuse Block - Underhood.
  2. Connect a test lamp between the control circuit terminal 35 X1 and ground.
  3. Ignition ON, command the Rear Defog Relay 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 K9 Body Control Module.
    • 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 K9 Body Control Module.
  4. If all circuits test normal, test or replace the X50A Fuse Block - Underhood.
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