Terminals Of Ecu

CHECK FRONT LIGHT ECU (FRONT CONTROLLER)

Fig 1: Identifying Front Light ECU Terminals (Front Controller)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance and voltage according to the value(s) in the table below.

RESISTANCE AND VOLTAGE REFERENCE

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A52-5 (ALTB) - Body ground	L - Body ground	+B power supply	Always	11 to 14 V
A52-1 (BATB) - Body ground	P - Body ground	+B power supply	Always	11 to 14 V
A50-1 (FMB3) - Body ground	LG - Body ground	+B power supply	Always	11 to 14 V
A50-5 (FMIG) - Body ground	Y - Body ground	IG power supply	Engine switch on (IG)	11 to 14 V
A50-2 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Measure the voltage according to the value(s) in the table below.

RESISTANCE AND VOLTAGE REFERENCE

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
B14-1 (HORL) - Body ground	G - Body ground	Horn (low pitched) signal	Horn is sounding	11 to 14 V
B14-2 (HORH) - Body ground	G - Body ground	Horn (high pitched) signal	Horn is sounding	11 to 14 V

If the result is not as specified, the ECU may have a malfunction.

CHECK STEERING PAD ECU (STEERING PAD SWITCH)

Fig 2: Identifying Steering Pad ECU Terminals (Steering Pad Switch)

Measure the voltage according to the value(s) in the table below.

VOLTAGE REFERENCE

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
z7-10 (+B) - Body ground	B - Body ground	+B power supply	Always	11 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.