DTC U3003:16 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2011600

Description	Front body control module (FBCM) power supply voltage (B+ power supply) low input
Detection condition	• Front body control module (FBCM) power supply circuit voltage of 8.8 V or less is detected for 10 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the PCM. • Battery malfunction • Generator malfunction • Front body control module (FBCM) connector or terminal malfunction • Front body control module (FBCM) power supply circuit malfunction ? Short to ground in the wiring harness between the following: • MAIN 200 A fuse—Front body control module (FBCM) terminal 2A • MAIN 200 A fuse—Front body control module (FBCM) terminal 1A • MAIN 200 A fuse—Front body control module (FBCM) terminal 1B • MAIN 200 A fuse—Front body control module (FBCM) terminal 3K • MAIN 200 A fuse—Front body control module (FBCM) terminal 3L ? INTERIOR 10 A fuse malfunction ? ROOM 25 A fuse malfunction ? HAZARD 25 A fuse malfunction ? Open circuit in wiring harness between the following terminals: • Battery positive terminal—Front body control module (FBCM) terminal 2A • Battery positive terminal—Front body control module (FBCM) terminal 1A • Battery positive terminal—Front body control module (FBCM) terminal 1B • Battery positive terminal—Front body control module (FBCM) terminal 3K • Battery positive terminal—Front body control module (FBCM) terminal 3L • Front body control module (FBCM) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 8.
2	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
2		No	Go to the next step.
3	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION.) • Is the battery normal?	Yes	Go to the next step.
3		No	Recharge or replace the battery, then go to Step 7. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION.)
4	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) (See GENERATOR INSPECTION [WITH i-ELOOP (SKYACTIV-G 2.5T)].) • Is the generator normal?	Yes	Go to the next step.
4		No	Replace the generator, then go to Step 7. (See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) (See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-G 2.5T)].)
5	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
5		No	Repair or replace the connector, then go to Step 7.
6	VERIFY FRONT BODY CONTROL MODULE (FBCM) POWER SUPPLY VOLTAGE • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Display the PID VPWR_B using the M-MDS. (See PID/DATA MONITOR INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the voltage B+?	Yes	Go to the next step.
6		No	Inspect the INTERIOR 10 A fuse, ROOM 25 A fuse and HAZARD 25 A fuse. • Any fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between the following: • MAIN 200 A fuse—Front body control module (FBCM) terminal 2A • MAIN 200 A fuse—Front body control module (FBCM) terminal 1A • MAIN 200 A fuse—Front body control module (FBCM) terminal 1B • MAIN 200 A fuse—Front body control module (FBCM) terminal 3K • MAIN 200 A fuse—Front body control module (FBCM) terminal 3L If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • Any fuse is damaged: ? Replace the fuse. • All fuses are normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between the following: • Battery positive terminal—Front body control module (FBCM) terminal 2A • Battery positive terminal—Front body control module (FBCM) terminal 1A • Battery positive terminal—Front body control module (FBCM) terminal 1B • Battery positive terminal—Front body control module (FBCM) terminal 3K • Battery positive terminal—Front body control module (FBCM) terminal 3L If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to the next step.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
8		No	DTC troubleshooting completed.