Terminals Of Ecu

CHECK HEATED STEERING WHEEL CONTROLLER

HINT:

Inspect the connectors from the back side while the connectors are connected.

Fig 1: Identifying Heated Steering Wheel Controller ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

TERMINAL DESCRIPTION AND VOLTAGE SPECIFICATION CHART

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
A-4 (CCW) - A-3 (CCX)	W-GR	IG power supply	Engine switch on (IG)	11 to 14 V
A-1 (CCU) - A-3 (CCX)	BR - GR	Heated steering wheel switch LED output signal	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) ON	Below 3 V
A-2 (CCV) - A-3 (CCX)	G-GR	Heated steering wheel switch input signal	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) pressed and held	10 to 14 V
B-3 (TH1) - A-3 (CCX)	G-GR	Thermistor input signal	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) ON at 0 to 40°C (32 to 104°F)	1.5 to 4.5 V
B-1 (TH2) - A-3 (CCX)	G-GR	Thermistor ground	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) ON	Below 1 V
B-4 (SH1) - A-3 (CCX)	R-GR	Heater ground	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) ON	Below 1 V
B-2 (SH2) - A-3 (CCX)	B-GR	Heater output signal	Engine switch on (IG), Outer mirror switch (Heated steering wheel switch) ON	10 to 14 V*
A-3 (CCX) - Body ground	GR - Body ground	Ground	Always	Below 1 Ω
HINT: *: The current to the heater turns ON/OFF depending on the temperature of the thermistor. As a result, it may take several minutes before a voltage value is output.