Terminals Of Ecu

CHECK STEERING LOCK ECU

Fig 1: Identifying Terminals Of E77 Steering Lock ECU Connector

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

CONNECTOR TERMINALS REFERENCE

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E77-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
E77-2 (SGND) - Body ground	BR - Body ground	Signal ground	Always	Below 1 Ω
E77-6 (IG2) - E77-1 (GND)	B - W-B	IG signal input	Engine switch on (IG)	11 to 14 V
E77-7 (B) - E77-1 (GND)	L - W-B	Power source	Always	11 to 14 V

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.

CONNECTOR TERMINALS REFERENCE

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E77-3 (IGE) - E77-1 (GND)	Y - W-B	Power source for motor drive	Motor operating	Below 1 V
E77-3 (IGE) - E77-1 (GND)	Y - W-B	Power source for motor drive	Motor not operating	11 to 14 V
E77-4 (SLP1) - E77-2 (SGND)	G - BR	Unlock position sensor output signal	Steering lock locked	11 to 14 V
E77-4 (SLP1) - E77-2 (SGND)	G - BR	Unlock position sensor output signal	Steering lock unlocked	Below 1 V
E77-5 (LIN) - E77-2 (SGND)	V - BR	LIN communication bus	Engine switch on (IG)	Pulse generation

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