DTC B1143:13 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2007800

System malfunction location

IG2 power supply control circuit malfunction

Detection condition

•  The front body control module (FBCM) detects an open circuit in the start stop unit circuit for 2 s or more with the ignition switched ON (engine off or on).

Fail-safe

—

Possible cause

•  Start stop unit connector or terminal malfunction

•  Start stop unit malfunction

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

•  Open circuit in the wiring harness between start stop unit terminal 2D and front body control module (FBCM) terminal 2U

•  Front body control module (FBCM) malfunction

System malfunction location	IG2 power supply control circuit malfunction
Detection condition	• The front body control module (FBCM) detects an open circuit in the start stop unit circuit for 2 s or more with the ignition switched ON (engine off or on).
Fail-safe	—
Possible cause	• Start stop unit connector or terminal malfunction • Start stop unit malfunction • Front body control module (FBCM) connector or terminal malfunction • Open circuit in the wiring harness between start stop unit terminal 2D and front body control module (FBCM) terminal 2U • 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 2 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 DTC B1143:13 displayed?	Yes	Go to the next step.
1		No	Go to Step 7.
2	INSPECT START STOP 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].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the start stop 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 6.
3	INSPECT START STOP UNIT • Inspect the start stop unit. (See START STOP UNIT INSPECTION.) • Is the start stop unit normal?	Yes	Go to the next step.
3		No	Replace the start stop unit, then go to Step 6. (See START STOP UNIT REMOVAL/INSTALLATION.)
4	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.
4		No	Repair or replace the connector, then go to Step 6.
5	INSPECT FRONT BODY CONTROL MODULE (FBCM) IG2 POWER SUPPLY CONTROL CIRCUIT FOR OPEN CIRCUIT • Verify that the start stop unit and front body control module (FBCM) connectors are disconnected. • Inspect the wiring harness for continuity between start stop unit terminal 2D (vehicle wiring harness side) and front body control module (FBCM) terminal 2U (vehicle wiring harness side). • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness and go to the next step.
6	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].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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 2 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 DTC B1143:13 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the front body control module (FBCM), then go to the next step. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
6		No	Go to the next step.
7	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)].)
7		No	DTC troubleshooting completed.