GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC blower controls system check performed?

Go to Step 2

Go to HVAC Blower Controls System Check

2

  1. Disconnect the blower motor relay.
  2. Connect a test light between terminal A2 and ground.

Is the test light on?

Go to Step 3

Go to Step 4

3

Connect a test light between the blower motor relay terminal A2 and terminal C2.

Is the test light on?

Go to Step 5

Go to Step 6

4

Repair the poor connection or open in CKT 1202.

Is the repair complete?

Go to Step 11

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5

  1. Place the ignition switch in the RUN position.
  2. Place the selector switch in the VENT position.
  3. Place the blower switch in the HI position.
  4. Connect the test light between the blower motor relay terminal A1 and ground.

Is the test light on?

--

Go to Step 7

Go to Step 8

6

Repair the poor connection or open in CKT 650.

Is the repair complete?

--

Go to Step 11

--

7

Replace the blower motor relay. Refer to Blower Motor Relay Replacement

Is the repair complete?

--

Go to Step 11

--

8

Inspect CKT 52 for an open or for a poor connection.

Is there an open or a poor connection?

--

Go to Step 9

Go to Step 10

9

Repair the poor connection or open in circuit 52.

Is the repair complete?

--

Go to Step 11

--

10

Replace the HVAC control selector switch. Refer to Control Assembly Replacement

Is the repair complete?

--

Go to Step 11

--

11

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

Have all the repairs been made?

--

Go to HVAC Blower Controls System Check

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