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

id0902p2010500

Description

Error light switch signal received from start stop unit

Detection condition

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

Fail-safe function

•  If DTC U0338:09 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated.

•  If DTC U0338:09 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.

Possible cause

•  Light switch malfunction

•  Start stop unit malfunction

•  Front body control module (FBCM) malfunction

System wiring diagram

Not applicable

Description	Error light switch signal received from start stop unit
Detection condition	• Front body control module (FBCM) receives the CAN error signals from the start stop unit 3 times continuously with the ignition switched ON (engine off or on).
Fail-safe function	• If DTC U0338:09 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated. • If DTC U0338:09 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.
Possible cause	• Light switch malfunction • Start stop unit malfunction • Front body control module (FBCM) malfunction
System wiring diagram	Not applicable

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)].) • 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 6.
2	VERIFY START STOP UNIT DTCs • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
2		No	Go to the next step.
3	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is the light switch normal?	Yes	Go to the next step.
3		No	Replace the light switch, then go to Step 5. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
4	PERFORM DTC INSPECTION AND VERIFY START STOP UNIT MALFUNCTION • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • 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	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
4		No	Go to Step 6.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • 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.
5		No	Go to the next step.
6	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)].)
6		No	DTC troubleshooting completed.