DTC U0164:68 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2010200

System malfunction location

Communication error between climate control unit

Detection condition

•  The front body control module (FBCM) could not receive signals from the climate control unit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

—

Possible cause

•  Climate control unit connector or terminal malfunction

•  Front body control module (FBCM) connector or terminal malfunction

•  Short to ground in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C

•  Short to power supply in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C

•  Open circuit in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C

•  Climate control unit malfunction

•  Front body control module (FBCM) malfunction

System malfunction location	Communication error between climate control unit
Detection condition	• The front body control module (FBCM) could not receive signals from the climate control unit for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	—
Possible cause	• Climate control unit connector or terminal malfunction • Front body control module (FBCM) connector or terminal malfunction • Short to ground in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C • Short to power supply in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C • Open circuit in wiring harness between climate control unit terminal N and front body control module (FBCM) terminal 1C • Climate control unit malfunction • Front body control module (FBCM) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN • Clear front body control module (FBCM) DTCs using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the DTC U0164:68 displayed?	Yes	A malfunction in LIN bus communication line can be considered. • Repair or replace the wiring harness between the climate control unit and front body control module (FBCM), then go to the next step.
1		No	Go to Step 9.
2	INSPECT CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Disconnect the climate control unit connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 8.
3	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Disconnect the front body control module (FBCM) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 8.
4	INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO GROUND • Verify that the climate control unit and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between front body control module (FBCM) terminal 1C (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness which is shorted to ground, then go to Step 8.
4		No	Go to the next step.
5	INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the climate control unit and front body control module (FBCM) connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Switch the ignition ON (engine off or on). • Measure the voltage at front body control module (FBCM) terminal 1C (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness which is shorted to power supply, then go to Step 8.
6	INSPECT CLIMATE CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT • Verify that the climate control unit and front body control module (FBCM) connectors are disconnected. • Switch the ignition to off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Inspect the wiring harness for continuity between climate control unit terminal N (vehicle wiring harness side) and front body control module (FBCM) terminal 1C (vehicle wiring harness side). • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness which has an open circuit, then go to Step 8.
7	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS CLIMATE CONTROL UNIT • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Clear front body control module (FBCM) DTCs using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the DTC U0164:68 displayed?	Yes	Replace the climate control unit, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
7		No	Go to Step 9.
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Clear front body control module (FBCM) DTCs using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the DTC U0164:68 displayed?	Yes	Replace the front body control module (FBCM), then go to the next step. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
9		No	DTC troubleshooting completed.