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Code 4: Air Mix Door Error

WARNING: This page is about a different car, the 2004 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Code 4 - Air Mix Door Error Diagram
G01987531Courtesy of SUZUKI OF AMERICA CORP.

This code will set if the output of the mix door indicator indicates that the door opening angle is out of range or does not change value when the door should be moving. This would indicate a short circuit or an open in the sensor or the associated wiring harness, a door motor that is not operating, or a malfunction of the ATC controller.

Fig 2: Identifying Code 4 - Air Mix Door Error Table (1 Of 2)
G01987532Courtesy of SUZUKI OF AMERICA CORP.
Fig 3: Identifying Code 4 - Air Mix Door Error Table (2 Of 2)
G01987533Courtesy of SUZUKI OF AMERICA CORP.