Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Repair any Powertrain Control Module (PCM) A/C Compressor Clutch related DTCs before proceeding with this test.
1. Turn the ignition on, engine off.
2. With the scan tool, clear all TIPM DTCs.
3. Turn the A/C Compressor Clutch on.
4. With the scan tool, read the DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. 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.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
CHECK THE (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
NOTE: Make sure the A/C Compressor Clutch is off when performing this step.
1. Turn the A/C Compressor Clutch off.
2. Turn the ignition off.
3. Disconnect the A/C Compressor Clutch harness connector.
4. Turn the ignition on, engine off.
  NOTE: Compare the brightness of the test light to that of a direct connection to the battery.
5. Connect a 12-volt test light between ground and the (C3) A/C Clutch Control Output circuit at the A/C Compressor Clutch harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - The test light should not illuminate brightly when connected to the A/C Clutch Control Output reference voltage. If the test light illuminates brightly, repair the short to voltage in the (C3) A/C Clutch Control Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (Z803) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z803) Ground circuit at the A/C Compressor Clutch harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (Z803) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE TIPM FOR PROPER OPERATION
1. Turn the ignition on, engine off.
2. With the scan tool, actuate the A/C Compressor Clutch.
3. Connect a 12-volt test light between ground and the (C3) A/C Clutch Control Output circuit at the A/C Compressor Clutch harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Verify there is proper pin to terminal contact at the A/C Compressor Clutch harness connector. If no problems are found, replace the A/C Clutch in accordance with the Service Information. (Refer to COMPRESSOR, A/C ) .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go to 5.
CHECK THE (C3) A/C CLUTCH CONTROL OUTPUT CIRCUIT FOR AN OPEN
1. Turn the ignition off
2. Disconnect the TIPM C10 harness connector.
3. Measure the resistance of the (C3) A/C Clutch Control Output circuit between the A/C Compressor Clutch harness connector and the TIPM C10 harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (C3) A/C Compressor Clutch Control Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go to 6.
TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the TIPM harness connectors for any damaged, broken, bent, pushed out or corroded terminals.
2. Inspect the TIPM wiring harness for any chafed, pierced, pinched, or partially broken wires.
3. Verify there is proper pin to terminal contact between the A/C Compressor Clutch and TIPM harness connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Replace the Totally Integrated Power Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .