Check the DIC/HVAC fuse in the fuse block.

Is the DIC HVAC fuse open?

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Go to Step 2

Go to Step 3

Locate and repair a short to ground in circuit 541 (BRN). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 13

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1. Place the ignition switch in the on position.
2. Connect a test lamp between the vacuum/electric solenoid harness connector terminal 6 and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

Locate and repair a poor connection or an open in circuit 541 (BRN). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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1. Place the heater A/C control in the Bi-Level position.
2. Turn the A/C to the OFF position.
3. Connect a test lamp between B+ and the vacuum/electric solenoid harness connector terminal 3 (circuit 361).

Does the test lamp light?

--

Go to Step 8

Go to Step 6

Check for poor connection or open in circuit 361 (PPL). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is there a poor connection or open in the circuit?

--

Go to Step 7

Go to Step 11

Locate and repair the fault in circuit 361 (PPL). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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1. Place the mode selector in the UPPER position.
2. Use a DMM in order to test for a short to ground on circuit 706 (LT BLU) at the vacuum/electric solenoid connector terminal 4.

Is there a short to ground?

--

Go to Step 9

Go to Step 12

Use a DMM in order to test for a short to ground on circuit 706 (LT BLU) at the heater A/C control connector terminal D8. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is there a short to ground?

--

Go to Step 10

Go to Step 11

Locate and repair the short to ground in circuit 706 (LT BLU) between the heater A/C control harness connector and the vacuum/electric solenoid harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 13

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

Is the repair complete?

--

Go to Step 13

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A fault exists in one of the following areas. Refer to Vacuum Test for further diagnosis.

Is the action complete?

--

Go to Step 13

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Verify that the system operates properly.

Does the system operate properly ?

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System OK

Go to Diagnostic System Check