Pinpoint Test F: U0164:87
WARNING: This page is about a different car, the 2023 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCMC U0164:87 Lost Communication With HVAC Control Module: Missing Message A continuous memory DTC that sets in the BCMC if data messages received from the HVAC module are missing. Possible Sources
- Communication network concern
- HVAC module (if equipped)
- BCMC
- F1 CHECK THE COMMUNICATION NETWORK
- Connect the diagnostic tool.
- Ignition ON.
- Using a diagnostic scan tool, perform a network test.
Does the HVAC module pass the network test?
Yes GO to F2 No REFER to: Controller Area Network (CAN) Module Communications Network . - F2 CHECK THE BCMC (BODY CONTROL MODULE C) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCMC CMDTCs.
Is BCMC DTC U0164:87 retrieved again?
Yes GO to F3 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. - F3 RETRIEVE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE DTCS
- Using a diagnostic scan tool, perform the HVAC module self-test.
Are any HVAC module DTCs recorded?
Yes REFER to: Climate Control System . No GO to F4 - F4 RECHECK THE BCMC (BODY CONTROL MODULE C) CMDTCS
- Using a diagnostic scan tool, clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCMC CMDTCs.
Is DTC U0164:87 still present?
Yes GO to F5 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 (DIAGNOSTIC TROUBLE CODE) U0164:87 SET IN OTHER MODULES
- Using a diagnostic scan tool, clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, retrieve all CMDTCs.
Is DTC U0164:87 set in other modules?
Yes GO to F6 No GO to F7 - F6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect the HVAC module connector.
- 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 HVAC module connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module . 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. - F7 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION
- Ignition OFF.
- Disconnect and inspect all BCMC 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
- Connect the BCMC connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) . 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.