Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

The DIC displays OC when there is an open condition within the system.
For intermittent diagnosis, refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.
Refer to AMBIENT AIR TEMPERATURE SENSOR RESISTANCE in order to verify the correct ambient temperature sensor readings.

Fig 1: Driver Information Center (DIC) Temperature Display Always Reads OC
Courtesy of GENERAL MOTORS CORP.