DTC B10A8:12 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2007400

System malfunction location

Headlight LO relay circuit malfunction

Detection condition

•  The front body control module (FBCM) detects a short to power supply in the headlight LO relay circuit with the ignition switched ON (engine off or on).

Fail-safe

—

Possible cause

•  Headlight LO relay malfunction

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

•  Short to power supply in the wiring harness between headlight LO relay terminal A and front body control module (FBCM) terminal 1M

•  Front body control module (FBCM) malfunction

System malfunction location	Headlight LO relay circuit malfunction
Detection condition	• The front body control module (FBCM) detects a short to power supply in the headlight LO relay circuit with the ignition switched ON (engine off or on).
Fail-safe	—
Possible cause	• Headlight LO relay malfunction • Front body control module (FBCM) connector or terminal malfunction • Short to power supply in the wiring harness between headlight LO relay terminal A and front body control module (FBCM) terminal 1M • 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). • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is DTC B10A8:12 displayed?	Yes	Go to the next step.
1		No	Go to Step 6.
2	INSPECT HEADLIGHT LO RELAY FOR MALFUNCTION • 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].) • Remove the headlight LO relay. • Inspect the headlight LO relay. (See RELAY INSPECTION.) • Is the headlight LO relay normal?	Yes	Go to the next step.
2		No	Replace the headlight LO relay, then go to Step 5.
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 5.
4	INSPECT HEADLIGHT LO RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the headlight LO relay is removed. • Verify that the front body control module (FBCM) connector is disconnected. • Connect 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].) • Switch the ignition ON (engine off or on). • Measure the voltage at front body control module (FBCM) terminal 1M (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness and go to the next step.
5	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). • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is DTC B10A8:12 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.)
5		No	Go to the next step.
6	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)].)
6		No	DTC troubleshooting completed.