Diagnostic Aids

The DIC displays dashes (- -) when there is a fault in the class 2 serial data circuit. This occurs only during the following modes:

• Average Fuel Economy
• Average Speed
• Fuel Used
• Instant Fuel Economy
• Trip Range

The compass display and the temperature display still operate normally when there is a fault in the class 2 serial data circuit. In this case refer to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in Data Link Communications for diagnosis.

Fig 1: Driver Information Center (DIC) Inoperative Symptom Table

Courtesy of GENERAL MOTORS CORP.