GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The HVAC control module will run a self diagnostic test at ignition ON. This test ensure the modules ability to operate. No external circuits are involved.

Conditions for Running the DTC

    • Source voltage is 8.7-16.5 volts.
    • The HVAC control module receives an ignition 3 voltage input.

Conditions for Setting the DTC

The HVAC control module detects an internal system failure.

Action Taken When the DTC Sets

The HVAC control module refuses all additional inputs.

Conditions for Clearing the DTC

The Diagnostic Trouble Code (DTC) Clearing must be performed.

Step

Action

Yes

No

Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Perform Diagnostic Trouble Code (DTC) Clearing .
  2. Turn OFF the ignition.
  3. Perform Diagnostic Trouble Code (DTC) Displaying .

Did DTC 010 reset?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

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

Did you complete the replacement?

Go to Step 4

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4

Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK