GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Astro - 4WD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Driver Information Center (DIC) Temperature Display Always Reads OC

Diagnostic Aids
    • The driver information center (DIC) displays OC when there is an open condition within the system.
    • For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
    • Refer to Ambient Air Temperature Sensor Resistance in order to verify the correct ambient temperature sensor readings.

Step

Action

Yes

No

Schematic Reference: Driver Information System Schematics

Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views

1

Did you review the Driver Information Center (DIC) Description and Operation?

Go to Step 2

Go to Driver Information Center (DIC) Description and Operation

2
  1. Disconnect the ambient temperature sensor.
  2. Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the ambient temperature sensor and the ground circuit of the ambient temperature sensor.
  3. Turn the ignition ON, with the engine OFF.

    4. Important: Verify the J 33431-C resistance settings with a DMM.

    Disconnect one of theJ 33431-C leads momentarily between the resistance settings in order to quickly update the DIC display.

  4. Vary the resistance on the J 33431-C from 2500-11200 ohms.
  5. Refer to Ambient Air Temperature Sensor Resistance in order to convert from resistance to DIC temperature display.

Does the DIC display the correct temperature?

Go to Step 5

Go to Step 3

3

Test the signal circuit of the ambient temperature sensor for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 4

4

Test the ground circuit of the ambient temperature sensor for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the harness connector of the ambient temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the DIC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the ambient temperature sensor. Refer to Ambient Air Temperature Gage Sensor Replacement .

Did you complete the replacement?

Go to Step 9

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8

Replace the DIC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step  2