Fail-Safe Chart [04/2013 - 10/2016]

Automatic Headlight Beam Level Control System

If the headlight leveling ECU assembly detects a malfunction in the automatic headlight beam level control system, it will indicate the malfunction and perform fail-safe control as indicated in the table below.

Item	Abnormality Detection Condition	Fail-safe Control	DTC Output	Warning Light	Return Condition
Headlight leveling motor high input voltage	High input voltage (more than 18.5 V)is detected.	Headlight leveling motor will be stopped.	-	-	Normal input voltage (below 17.5 V) is detected.
Headlight leveling motor low input voltage	Low input voltage (below 9 V) is detected.	Headlight leveling motor will be stopped.	-	-	Normal input voltage (more than 9.3 V) is detected.
Height control sensor abnormal input voltage	Abnormal input voltage (below 4.60 V, more than 6.25 V) is detected.	Headlight leveling motor will be stopped.	B2416	Illuminates	Normal input voltage (4.61 to 6.24 V) is detected.
Height control sensor abnormal signal voltage	Abnormal signal voltage (below 0.25 V, more than 4.75 V) is detected.	Headlight leveling motor will be stopped.	B241A	Illuminates	Normal signal voltage (0.26 to 4.74 V) is detected.
Speed sensor abnormal signal	Abnormal wheel speed sensor signal	If either of the front wheel speed signals is abnormal, control continues using the normal signal. If both of the front wheel speed signals are abnormal, judgment is performed as though the vehicle is stationary and control continues.	B2415	-	Normal signal is detected.
CAN communication (skid control ECU)	Skid control ECU communication error (vehicle speed signal)	If the leveling motor is not actuating, stops the abnormal headlight leveling motor at the current position. If the leveling motor is actuating, stops the abnormal headlight leveling motor after actuating for 17 seconds.	U0129	-	Normal signal is detected.
CAN communication (main body ECU (multiplex network body ECU))	Main body ECU (multiplex network body ECU) communication error (headlight signal)	If the leveling motor is not actuating, stops the abnormal headlight leveling motor at the current position. If the leveling motor is actuating, stops the abnormal headlight leveling motor after actuating for 17 seconds.	U0142	-	Normal signal is detected.
	Main body ECU (multiplex network body ECU) communication error (destination information, VAST request, time stamp)	-	U0142	-	Normal signal is detected.
CAN communication (ECM)	ECM communication error (power source signal, transmission information)	-	U0100	-	Headlight leveling ECU assembly is replaced.
Headlight leveling ECU (CAN communication)	Headlight leveling ECU internal error	System does not perform control.	U1000	-	Headlight leveling ECU assembly is replaced.
ROM error	Stored data broken is detected.	System does not perform control.	B2420	Illuminates	Headlight leveling ECU assembly is replaced.
Invalid data (destination information)	Invalid destination information is detected.	System does not perform control.	B2453	Illuminates	Synchronization is completed.
Invalid data (initialization of height control sensor)	Abnormal height sensor data at initialization	System does not perform control.	B2452	Illuminates	Initialization is completed after engine switch off to on (IG).