Check the High Blower fuse in the Fuse block.

Is the fuse open?

--

Go to Step 2

Go to Step 5

Check for a short to ground in circuit 40 (ORN).

Is there a short to ground in circuit 40 (ORN)?

--

Go to Step 3

Go to Step 4

Repair a short to ground in circuit 40 (ORN).

Is the repair complete?

--

System OK

--

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

Is the repair complete?

--

System OK

--

1. Disconnect the blower motor resistor.
2. Use a test light to backprobe between the blower motor resistor harness connector terminal G (circuit 40) to ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 11

1. Turn the ignition switch to the RUN position.
2. Place the heater-A/C control in the VENT position.
3. Place the blower switch in the HI position.
4. Use a test light to backprobe between the blower motor resistor harness connector terminal F (circuit 52) and ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

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

Is the repair complete?

--

System OK

--

1. Turn the ignition switch to the OFF position.
2. Disconnect the heater-A/C control connector C 1.
3. Check for a poor connection, an open, or a short to ground in circuit 52 (ORN) between the heater-A/C control harness connector C1 terminal C and the blower motor resistor harness connector terminal F.

Is there a poor connection, an open or a short to ground in circuit 52 (ORN)?

--

Go to Step 9

Go to Step 10

Repair the fault in circuit 52 (ORN).

Is the repair complete?

--

System OK

--

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

Is the repair complete?

--

System OK

--

Repair an open in circuit 40 (ORN).

Is the repair complete?

--

System OK

--