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 - 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 - 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 the appropriate "Information and Entertainment Systems" article for the procedure.
- 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 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 - 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, GO to F8.
  For DTC U0256:00, GO to F9.
- No : GO to F7.
F6 CHECK HVAC FUNCTIONS
- Operate the HVAC system from the controls on the FCIM.
- Does the HVAC system operate correctly?
- Yes : GO to F7.
- No : REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS to diagnose HVAC symptoms.
F7 CHECK THE HSWM CONNECTION
- Disconnect and inspect all HSWM connectors.
- Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
- Reconnect the HSWM connectors. Make sure they seat and latch correctly.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HSWM.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
- Yes : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HSWM. REFER to HEATED STEERING WHEEL MODULE (HSWM) . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
F8 CHECK THE BCM CONNECTION
- Disconnect and inspect all BCM connectors.
- Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HSWM.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
- Yes : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
F9 CHECK THE FCIM CONNECTION
- Disconnect and inspect all FCIM connectors.
- Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
- Reconnect the FCIM connectors. Make sure they seat and latch correctly.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HSWM.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
- Yes : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new FCIM. Refer to the appropriate "Information and Entertainment Systems" article for the procedure. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.