GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC diagnostic system check performed?

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Go to Step 2

Go to Diagnostic System Check

2

  1. Disconnect the electric air inlet actuator.
  2. Place the ignition switch in the RUN position.
  3. Using a test lamp, probe between the electric air inlet actuator connector terminal 5 and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 3

Go to Step 4

3

Using a test lamp, probe the electric air inlet actuator connector terminals 7 and 5. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 5

Go to Step 6

4

Repair the poor connection or open in circuit 241 between the electric air inlet actuator connector terminal 5 and S264. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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5

  1. Set the heater-A/C control to the air recirculation position.
  2. Using a test lamp, probe the electric air inlet actuator connector terminal 6 and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 7

Go to Step 8

6

Repair the poor connection or open in circuit 150 between the electric air inlet actuator connector terminal 7 and S213. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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7

Replace the electric air inlet actuator. Refer to Air Inlet Actuator Replacement .

Is the repair complete?

--

Go to Step 13

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8

Using a test lamp, probe the heater-A/C control connector C2 terminal H and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 9

Go to Step 10

9

Repair the poor connection or open in circuit 684 between the heater-A/C control connector C2 terminal H and the electric air inlet actuator connector terminal 6. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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10

Using a test lamp, probe the heater-A/C control connector C2 terminal K and B+. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 11

Go to Step 12

11

Replace the heater-A/C control. Refer to HVAC Module Assembly Replacement .

Is the repair complete?

--

Go to Step 13

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12

Repair the poor connection or open in circuit 150. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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13

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to Diagnostic System Check

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