GM Service Manual Online
For 1990-2009 cars only

Blower Motor High Speed Inoperative Front

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC diagnostic system check performed?

--

Go to Step 2

Go to Diagnostic System Check

2

  1. Disconnect the blower motor resistor.
  2. Connect a test lamp between the blower motor resistor connector terminal G and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 3

Go to Step 4

3

  1. Turn the ignition switch to the RUN position.
  2. Turn the heater-A/C control to the high position.
  3. Connect a test lamp between the blower motor resistor terminal F and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 5

Go to Step 6

4

Check for a short to ground in circuit 40. Refer to Circuit Testing in Wiring Systems.

Is a short to ground present?

--

Go to Step 9

Go to Step 10

5

Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement .

Is the repair complete?

--

Go to Step 11

--

6

Connect the test lamp between the heater-A/C control connector C1 terminal C and ground. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 7

Go to Step 8

7

Repair the poor connection or open in circuit 52. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 11

--

8

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

Is the repair complete?

--

Go to Step 11

--

9

Repair the short to ground in circuit 40. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 11

--

10

Repair the poor connection or open in circuit 40. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

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 Diagnostic System Check

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