Schematic Reference: HVAC Schematics

DEFINITION: The air conditioning (A/C) compressor clutch will not disengage when an A/C request has not been made and a Powertrain DTC has not been set.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

1. Start the engine.
2. Place the mode switch in the PANEL position.
3. Place the A/C request switch in the OFF position.

Does the A/C compressor clutch engage?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

1. Turn OFF the ignition.
2. Disconnect the A/C compressor clutch.
3. Turn ON the ignition, with the engine OFF.
4. Probe the supply voltage circuit of the A/C compressor clutch with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

Test the supply voltage circuit of the A/C compressor clutch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 5

1. Turn OFF the ignition.
2. Disconnect the A/C compressor clutch relay.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the control circuit and the ignition 3 voltage circuit of the A/C compressor clutch relay.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

Test the control circuit of the A/C compressor clutch relay for a short to ground. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 10

Test the status signal circuit of the A/C compressor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 9

Inspect for poor connections at the A/C compressor clutch relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 11

Inspect for poor connections at the harness connector of the A/C compressor clutch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 12

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 13

Replace the A/C compressor clutch relay.

Did you complete the replacement?

Go to Step 14

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Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .

Did you complete the replacement?

Go to Step 14

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Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3