HEATED STEERING WHEEL SYSTEM(w/o Lane Departure Alert System) TERMINALS OF ECU

STEERING WHEEL HEATER CONTROL ASSEMBLY

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

   Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
   A-1 (CCU) - Body ground	LED output signal	Engine switch on (IG), Steering heater switch (refreshing seat switch) on	Below 3 V
   A-2 (CCV) - Body ground	Steering heater switch (refreshing seat switch) input signal	Engine switch on (IG), Steering heater switch (refreshing seat switch) pressed and held	11 to 14 V
   A-3 (CCX) - Body ground	Ground	Always	Below 1 Ω
   A-4 (CCW) - Body ground	IG power supply	Engine switch on (IG)	11 to 14 V
   B-1 (TH1) - Body ground	Thermistor input signal	Engine switch on (IG), Steering heater switch (refreshing seat switch) on at 0 to 40°C (32 to 104°F)	1.5 to 4.5 V*1
   B-2 (TH2) - Body ground	Thermistor ground	Engine switch on (IG), Steering heater switch (refreshing seat switch) on	Below 1 V
   B-3 (SH2) - Body ground	Heater output signal	Engine switch on (IG), Steering heater switch (refreshing seat switch) on	11 to 14 V*2
   B-4 (SH1) - Body ground	Heater ground	Engine switch on (IG), Steering heater switch (refreshing seat switch) on	Below 1 V

   Tip:
   

   • *1: When ambient temperature is 0 to 40°C (32 to 104°F).

   • *2: 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.