DTC B10A6:64 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2008300

Description

Light switch error signal received

Detection condition

•  Front body control module (FBCM) receives the error signals from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe function

•  If DTC B10A6:64 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated.

•  If DTC B10A6:64 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.

Possible cause

•  Start stop unit malfunction

•  Light switch malfunction

•  Front body control module (FBCM) malfunction

System wiring diagram

Not applicable

Description	Light switch error signal received
Detection condition	• Front body control module (FBCM) receives the error signals from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe function	• If DTC B10A6:64 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated. • If DTC B10A6:64 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.
Possible cause	• Start stop unit malfunction • Light switch 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)].) • Switch the ignition ON (engine off or on) and wait for 5 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 4.
2	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is the light switch normal?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
2		No	Replace the light switch, then go to the next step. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
3	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)].) • Switch the ignition ON (engine off or on) and wait for 5 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.
3		No	Go to the next step.
4	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)].)
4		No	DTC troubleshooting completed.