Pinpoint Test F: DTC U0140:00, U0164:00 And U0256:00

F1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify there is an observable symptom present.
- Is an observable symptom present?
- Yes: GO to F2 .
- No: The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
F2 CHECK THE COMMUNICATION NETWORK
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Do all modules pass the network test?
- Yes: GO to F3 .
- No: REFER to MODULE COMMUNICATIONS NETWORK .
F3 RETRIEVE THE RECORDED DTCs FROM THE BCM , HVAC MODULE AND FCIM SELF-TESTS
- Enter the following diagnostic mode on the scan tool: Self-Test - Body Control Module (BCM).
- Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
- Enter the following diagnostic mode on the scan tool: Self-Test - Front Controls Interface Module (FCIM).
- Record DTCs from the self-tests.
- Is DTC U3003:16 or DTC U3003:17 recorded from the self-tests?
- Yes: For BCM DTCs, REFER to MULTIFUNCTION ELECTRONIC MODULES .
  For HVAC module DTCs, REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
  
  For FCIM DTCs, REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
- No: GO to F4 .
F4 RECHECK THE HSWM MODULE DTCs
NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.
- Clear the DTCs.
- Wait 10 seconds.
- Repeat the HSWM self-test.
- Is DTC U0140:00, U0164:00 or U0256:00 still present?
- Yes: For DTC U0140:00 and U0256:00, GO to F5 .
  For DTC U0164:00, GO to F6.
- No: The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
F5 CHECK FOR DTC U0140:00 OR U0256:00 SET IN OTHER MODULES
- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test - Accessory Protocol Interface Module (APIM).
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0140:00 or U0256:00 set in the APIM ?
- Yes: For DTC U0140:00, INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test.
  For DTC U0256:00, INSTALL a new FCIM . REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . CLEAR the DTCs. REPEAT the self-test.
- No: INSTALL a new HSWM . REFER to HEATED STEERING WHEEL MODULE (HSWM) . TEST the system for normal operation.
F6 CHECK HVAC FUNCTIONS
- Operate the HVAC system from the controls on the FCIM .
- Does the HVAC system operate correctly?
- Yes: INSTALL a new HSWM . REFER to HEATED STEERING WHEEL MODULE (HSWM) . TEST the system for normal operation.
- No: REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS and DIAGNOSE HVAC symptoms.