B11D3

B11D3-00-A/C COOLDOWN TEST PERFORMANCE - COMPRESSOR NOT ENGAGED

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Whenever an A/C Cooldown Test is performed.

- Set Condition:
The A/C Heater Module receives a BUS message from the Powertrain Control Module (PCM) that the compressor is not engaged when it is requested.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK FOR ACTIVE BUS COMMUNICATION DTCS
1. Ignition on, engine not running.
2. Using the scan tool, read BCM DTCs.

Are there any Active BUS Communication DTCs present?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection

No

- Go To 2

2. CHECK FOR STORED BUS COMMUNICATION DTCS
1. Ignition on, engine not running.
2. Using the scan tool, read DTCs.

Are there any inactive or stored BUS Communication DTCs present?

Yes

- Perform the Stored Lost Communication DTCs diagnostic procedure. Stored Lost Communication DTCs

No

- Go To 3

3. CHECK FOR PCM A/C COMPRESSOR DTCS
1. Ignition on, engine not running.
2. Using the scan tool, read PCM DTCs.

Are there any PCM A/C Compressor DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 4

4. CHECK THE A/C COMPRESSOR
1. Ignition on, engine running.
2. Using the A/C heater Control, request A/C maximum cool.

Does the A/C Compressor Clutch engage?

Yes

- Go To 5

No

- A/C Clutch Coil.

5. CHECK IF THE DTC RESETS
1. Turn the ignition off to the lock position.
2. Ignition on, engine not running.
3. Using the scan tool, erase HVAC DTCs.
4. Turn the ignition off to the lock position.
5. Ignition on, engine not running.
6. Using the scan tool, perform the A/C Cooldown Test. Follow the instructions on the scan tool.
7. Using the scan tool, read HVAC DTCs.

Does this DTC reset?

Yes

- Replace and program the A/C Heater Module. A/C And Heater Control Module - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 6

6. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.