Electronic Control Modules - Electrical Diagnostics: Diagnosis Jeep Commander I

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Test

1. 1) CHECK FOR ANY POWERTRAIN CONTROL MODULES DTCS NOTE: Make sure the Battery is in good condition. Using the Midtronics Battery Tester, test the Battery before continuing. NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output. NOTE: Make sure the generator drive belt is in good operating condition. NOTE: Inspect the fuses in the IPM. If an open fuse is found, use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage. Turn the ignition on. With the scan tool, read active PCM DTC's. Does the scan tool display any active PCM DTC's? Yes Refer to the appropriate Engine ELECTRICAL DIAGNOSTICS article for the diagnostic test procedure. No Check the above conditions that can cause a low voltage condition. Repair as necessary.

1. 1) CHECK FOR ANY POWERTRAIN CONTROL MODULES DTCS NOTE: Make sure the Battery is in good condition. Using the Midtronics Battery Tester, test the Battery before continuing. NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output. NOTE: Make sure the generator drive belt is in good operating condition. NOTE: Inspect the fuses in the IPM. If an open fuse is found, use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage. Turn the ignition on. With the scan tool, read active PCM DTC's. Does the scan tool display any active PCM DTC's? Yes Refer to the appropriate Engine ELECTRICAL DIAGNOSTICS article for the diagnostic test procedure. No Check the above conditions that can cause a high voltage condition. Repair as necessary.

Scheme 1

1. 1) CHECK FOR ACTIVE DTC With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active? Yes Go to 2) . No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2. 2) CHECK VIN IN PCM With the scan tool compare the VIN that is programmed into the PCM to the VIN on the vehicle. Does the VIN programmed into the PCM match the vehicles VIN? Yes Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Program the correct VIN in the PCM and retest.

1. 1) REPLACE THE FRONT CONTROL MODULE IF DTC IS ACTIVE With the scan tool, read the active DTC's. Does the scan tool display this DTC as active? Yes Replace and program the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

1. 1) CHECK FOR ACTIVE DTC With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active? Yes Go to 2) . No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2. 2) CONFIGURE THE FCM TO THE VEHICLE With the scan tool enter program network configuration and program the FCM to the vehicle configuration. With the scan tool, erase FCM DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active? Yes Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Repair is complete.

Scheme 2

1. 1) TEST FOR INTERMITTENT CONDITION Turn the ignition on. With the scan tool, record and erase FCM DTC's. Cycle the ignition from on to off 3 times. Turn the ignition on. With the scan tool, read active FCM DTC's. Does the scan tool display this DTC as active? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. 2) CHECK THE (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO THE (D54) CAN B BUS (-) CIRCUIT Turn the ignition off. Disconnect the Front Control Module C1 harness connector. Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) CAN B Bus (-) circuit. Is resistance below 1000.0 ohms? Yes Go to 3) . No Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
3. 3) (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) CAN B Bus (-) circuit. While monitoring the ohmmeter, disconnect each CAN B Bus module one at a time. NOTE: This is to determine if the circuits are shorted together internally within a module or if the circuits are shorted together in the harness. NOTE: Disconnecting an in-line connector can eliminate a module or group of modules from the list of possible causes for this fault. Refer to the wiring diagrams to assist in diagnosis. Is resistance below 1000.0 ohms with all the CAN B Bus modules disconnected? Yes Repair the (D55) CAN B Bus (+) circuit for a short to the (D54) CAN B Bus (-) circuit. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace the module that when disconnected the short together was eliminated, in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for powertrain DTCs. No Go to 3) .
3. 3) VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the ECM/PCM is active on the bus. Is the ECM/PCM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the ECM/PCM? Yes Replace/update the ECM/PCM in accordance with the service information. Perform the appropriate VERIFICATION TEST. No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE TCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the TCM is active on the bus. Is the TCM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the TCM? Yes Replace/update the TCM (PCM - 4.7L and 5.7L only) in accordance with the service information. Perform the appropriate VERIFICATION TEST. No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM related DTCs. No Go to 3) .
3. 3) VERIFY THAT THE SHIFT LEVER ASSEMBLY IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the Shift Lever Assembly is active on the bus. Is the Shift Lever Assembly active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the Shift Lever Assembly? Yes Replace/update the Shifter Lever Assembly in accordance with the service information. Perform the appropriate VERIFICATION TEST. No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE FDCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the FDCM is active on the bus. Is the FDCM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the FDCM? Yes Replace/update the Final Drive Control Module in accordance with the service information. Perform the appropriate VERIFICATION TEST. No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE ABS IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the ABS is active on the bus. Is the ABS active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the ABS? Yes Replace/update the Antilock Brake Module in accordance with the service information. Perform «ABS VERIFICATION TEST»(ref-288231-S35424443252008062000000) . No Replace/update the module that set this DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE FCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the FCM is active on the bus. Is the FCM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the FCM? Yes Replace/update the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE ORC IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the ORC is active on the bus. Is the ORC active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the ORC? Yes Replace/update the Occupant Restraint Controller in accordance with the service information. Perform «*ORC VERIFICATION TEST - VER 1»(ref-288282-S32343254442008062000000) . No Replace/update the module that set this DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE CCN IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the CCN is active on the bus. Is the CCN active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the CCN? Yes Replace/update the Cluster (CCN) in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE PTS IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the PTS is active on the bus. Is the PTS active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the PTS? Yes Replace/update the Park Assist Module (PTS) in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE HVAC IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the HVAC is active on the bus. Is the HVAC active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the HVAC? Yes Replace/update the A/C Heater Control in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set the DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE ITM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the ITM is active on the bus. Is the ITM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the ITM? Yes Replace/update the Intrusion Transceiver Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set the DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE WCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the WCM is active on the bus. Is the WCM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the WCM? Yes Replace/update the Sentry Key Remote Entry Module in accordance with the service information. Perform «SKREEM/SKIM VERIFICATION TEST»(ref-288274-S29326682772008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE SUNR IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the SUNR is active on the bus. Is the SUNR active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the SUNR? Yes Replace/update the Sunroof Motor/Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE RADIO IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the Radio is active on the bus. Is the Radio active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the Radio? Yes Replace/update the Radio in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE AMPLIFIER IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the Amplifier is active on the bus. Is the Amplifier active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the Amplifier? Yes Replace/update the Amplifier in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

Scheme 3

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE SATELLITE RECEIVER IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the SDARS is active on the bus. Is the SDARS active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the SDARS? Yes Replace/update the Satellite Receiver in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set the DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE VES IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the VES is active on the bus. Is the VES active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the VES? Yes Replace/update the Monitor/DVD Media System in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE HFM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the HFM is active on the bus. Is the HFM active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the HFM? Yes Replace/update the Hands Free Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE DDM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the DDM is active on the bus. Is the DDM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the DDM? Yes Replace/update the Driver Door Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE PDM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the PDM is active on the bus. Is the PDM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the PDM? Yes Replace/update the Passenger Door Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE HSM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the HSM is active on the bus. Is the HSM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the HSM? Yes Replace/update the Heated Seat Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE MSMD IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the MSMD is active on the bus. Is the MSMD active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the MSMD? Yes Replace/update the Memory Seat Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE SCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the SCM is active on the bus. Is the SCM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the SCM? Yes Replace/update the Steering Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Go to 3) .
3. 3) VERIFY THAT THE PLGM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the PLGM is active on the bus. Is the PLGM active on the bus? Yes Go to 4) . No See «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for NO RESPONSE diagnostic procedures. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the PLGM? Yes Replace/update the Power Liftgate Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE LRSM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the LRSM is active on the bus. Is the LRSM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the LRSM? Yes Replace/update the Rain Sensor in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE AHBM (SMARTBEAM) IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the AHBM (SMARTBEAM) is active on the bus. Is the AHBM (SMARTBEAM) active on the bus? Yes Go to 4) . No Refer to the NO RESPONSE test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the AHBM (SMARTBEAM)? Yes Replace/update the Inside Rearview Mirror (SMARTBEAM) in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

Scheme 4

1. 1) RECONFIGURE THE FRONT CONTROL MODULE Turn the ignition on. With the scan tool, select network view and press the gateway button. This will list the CAN modules on the vehicle. Read and record the listed modules. With the scan tool, select FCM, miscellaneous functions then add/remove ECUs. With the scan tool, add or remove the module that was not configured in the FCM. With the scan tool, erase DTC's. Cycle the ignition from on to off 3 times and read the active FCM DTC's. Does the scan tool display this DTC as active? Yes Retest system and attempt to reconfigure the FCM. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Repair is complete. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. 1) VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active DTCs. Is this DTC active? Yes Go to 2) . No Refer to the Stored Lost Communication test procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table.
2. 2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs to the conditions listed above? Yes Diagnose and repair the DTC. Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a complete list of the symptoms. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for PCM DTCs. No Go to 3) .
3. 3) VERIFY THAT THE SCM IS ACTIVE ON THE BUS Turn the ignition on. With the scan tool, select Network Diagnostics. Verify that the SCM is active on the bus. Is the SCM active on the bus? Yes Go to 4) . No Refer to «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a NO RESPONSE test procedure.
4. 4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS With the scan tool, select Network Diagnostics. Is there more than one module with active DTCs "Logged Against" the SCM? Yes Replace/update the Steering Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace/update the module that set this DTC in accordance with the service information. Perform the appropriate VERIFICATION TEST.

Scheme 5

1. 1) CHECK THE STATUS OF THE ERROR MESSAGE NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be displayed. NOTE: Ensure the scan tool is updated to the latest software. With the scan tool, record the error message. Disconnect the scan tool from the DLC. Cycle the ignition from on to off 3 times. Turn the ignition on. Does the scan tool display this same error message? Yes Go to step 2) . No The conditions that caused this error message to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. 2) (D71) DIAGNOSTIC CAN C (-) CIRCUIT OPEN Turn the ignition off. Disconnect the Front Control Module C1 harness connector. Disconnect the scan tool from the DLC. Measure the resistance of the (D71) Diagnostic CAN C (-) circuit between the FCM connector and the DLC. Is the resistance below 5.0 ohms? Yes Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Repair the (D71) Diagnostic CAN C (-) circuit for an open. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. 1) CHECK THE STATUS OF THE ERROR MESSAGE NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be displayed. NOTE: Ensure the scan tool is updated to the latest software. With the scan tool, record the error message. Disconnect the scan tool from the DLC. Cycle the ignition from on to off 3 times. Turn the ignition on. Does the scan tool display this same error message? Yes Go to step 2) . No The conditions that caused this error message to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. 2) (D72) DIAGNOSTIC CAN C (+) CIRCUIT OPEN Turn the ignition off. Disconnect the Front Control Module C1 harness connector. Disconnect the scan tool from the DLC. Measure the resistance of the (D72) Diagnostic CAN C (+) circuit between the FCM connector and the DLC. Is the resistance below 5.0 ohms? Yes Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Front Control Module in accordance with the service information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Repair the (D72) Diagnostic CAN C (+) circuit for an open. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. 1) VERIFY DTC IS STORED NOTE: Stored faults may indicate a customer perceived intermittent condition. NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read stored DTCs. Is this DTC stored? Yes Go to step 2) . No Diagnose the active DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-288232-S32656508122008062000000) table for a list of the symptoms.
2. 2) CHECK THE ENVIRONMENTAL DATA With the scan tool, read the loss of communication environmental data. Does the loss of communication environmental odometer data match up to any of the previous service procedures listed in the possible causes or are their any stored CAN B or C hardware electrical, battery, ignition voltage, VIN missing/mismatch, FCM configuration DTCs present with matching environmental data? Yes These DTCs may have been the result of other service procedures performed. Clear DTCs. No Go to step 3) .
3. 3) VERIFY INTERMITTENT LOST COMMUNICATION DTC - WIRING CONCERNS Turn the ignition on. With the scan tool, select Network Diagnostics. Is there more than one ECU with stored DTCs "Logged Against" the module and one or more lost communication DTCs stored in the offending module? Yes Verify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals. Repair as necessary. No Go to step 4) .
4. 4) VERIFY INTERMITTENT LOST COMMUNICATION DTC - OFFENDING MODULE Turn the ignition on. With the scan tool, select Network Diagnostics. Is there more than one ECU with stored DTCs "Logged Against" the module and NO lost communication DTCs stored in the offending module? Yes Check for TSB related to this offending module. No Go to step 5) .
5. 5) VERIFY INTERMITTENT LOST COMMUNICATION DTC - REPORTING MODULE Turn the ignition on. With the scan tool, select Network Diagnostics. Is there ONLY ONE ECU with stored DTCs "Logged Against" the module? Yes Check for TSB related to the module that set this DTC. No Verify if the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals. Repair as necessary.

1. 1) Perform Body Verification Test Disconnect all jumper wires and reconnect all previously disconnected components and connectors. Ensure that all accessories are turned off. Ensure that the battery is fully charged. Turn the ignition on. With the scan tool, record and erase DTCs from all modules. If an electronic control module was replaced, select the applicable module from the scan tool menu and press "Misc. Functions". If the module has programmable features, program as necessary. (Export only) If the Intrusion Transceiver Module (ITM) and/or Siren was replaced, select ITM from the from the scan tool ECU view menu then "Misc. Functions" and perform the applicable replacement procedure. Perform this step only if diagnosing faults related to the HVAC system. The Manual Temperature Control (MTC) is not on the Bus and not addressable with a scan tool. Perform the following to clear DTCs from the MTC: 1. Turn the blower control on. 2. Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch. 3. When the A/C status indicator begins flashing DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. For vehicles equipped with Automatic Temperature Control (ATC), if repairs were made to any of the HVAC doors, linkage, door actuators, or door actuator circuits, run the actuator calibration function by selecting the following from the scan tool menu: select HVAC, More Options, System Tests, Actuator Calibration Test, and Start. Follow the directions displayed by the scan tool. Allow the test to run to completion before proceeding. For vehicles equipped with MTC, if repairs were made to any of the HVAC doors, linkage, door actuators, or door actuator circuits, run the door calibration function by performing the following: 1. Turn the ignition on. 2. Turn the blower control to off. 3. Press the EBL mode switch down, turn the blower control on, wait until the EBL LED starts flashing (approximately 5 seconds) and then release the mode switch. Wait approximately 90 seconds for the calibration process to run to completion before proceeding. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Operate all functions of the system that caused the original concern. If a repair or module replacement was done to the power windows, operate the motor fully down and then to the full up position and stall it for 2 seconds. With the scan tool, select ECU View. With the scan tool, select ECU View and check for DTCs in the modules. Perform this step only if diagnosing faults related to the MTC HVAC system. NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated. Perform the following to read DTCs from the MTC: 1. Turn the blower control on. 2. Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch. 3. Read the DTCs from the flashing A/C status indicator. Are DTCs present in any of the modules or is the original condition still present? Yes The repair is not complete. Refer to the related service category for the DTC or symptom that is still present. No The repair is complete.