DTC U0338:09 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2010500

System malfunction location

Error light switch signal received from start stop unit

Detection condition

•  The front body control module (FBCM) receives CAN error signals from the start stop unit 3 times with the ignition switched ON (engine off or on).

Fail-safe

—

Possible cause

•  Light switch malfunction

•  Start stop unit malfunction

•  Front body control module (FBCM) malfunction

System wiring diagram

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System malfunction location	Error light switch signal received from start stop unit
Detection condition	• The front body control module (FBCM) receives CAN error signals from the start stop unit 3 times with the ignition switched ON (engine off or on).
Fail-safe	—
Possible cause	• Light switch malfunction • Start stop unit malfunction • Front body control module (FBCM) malfunction
System wiring diagram	—

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 the DTC U0338:09 displayed?	Yes	Go to the next step.
1		No	Go to Step 5.
2	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is the light switch normal?	Yes	Go to the next step.
2		No	Replace the light switch, then go to Step 4. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
3	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS START STOP UNIT • 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 the DTC U0338:09 displayed?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
3		No	Go to Step 5.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • 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 the DTC U0338:09 displayed?	Yes	replace the front body control module (FBCM), then go to the next step. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	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)].)
5		No	DTC troubleshooting completed.