Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The 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 | |
Is the A/C compressor clutch engaged? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections | |
3 | With a scan tool, observe the A/C Request Signal parameter in the Body Control Module Input data list. Does the scan tool indicate the A/C Request Signal parameter is Yes? | Go to Step 5 | Go to Step 4 |
4 | Disconnect the A/C compressor clutch relay. Does the A/C compressor clutch disengage? | Go to Step 9 | Go to Step 6 |
5 | Disconnect the evaporator temperature sensor. Does the A/C compressor clutch disengage? | Go to Step 7 | Go to Step 8 |
6 | Test the supply voltage circuit of the A/C compressor clutch for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 10 |
7 | Test the A/C request signal circuit of the HVAC control module for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 11 |
8 | Test the A/C request signal circuit of the body control module (BCM) for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 12 |
9 | Inspect for poor connections at the A/C compressor clutch relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13 |
10 | Inspect for poor connections at the harness connector of the A/C compressor clutch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 14 |
11 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 15 |
12 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 16 |
13 | Replace the A/C compressor clutch relay. Refer to Compressor Relay Replacement . Did you complete the replacement? | Go to Step 17 | -- |
14 | Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement . Did you complete the replacement? | Go to Step 17 | -- |
15 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | -- |
16 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | -- |
17 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
