HEATED STEERING WHEEL SYSTEM > TERMINALS OF ECU

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CHECK HEATED STEERING WHEEL CONTROLLER

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


C233761E01

  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
    		Power switch on (IG), Outer mirror switch (Heated steering wheel switch) on
    		Below 3 V
    A-2 (CCV) - Body ground
    		Steering heater switch input signal
    		Power switch on (IG), Outer mirror switch (Heated steering wheel 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
    		Power switch on (IG)
    		11 to 14 V
    B-1 (TH1) - Body ground
    		Thermistor input signal
    		Power 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*1
    B-2 (TH2) - Body ground
    		Thermistor ground
    		Power switch on (IG), Outer mirror switch (Heated steering wheel switch) on
    		Below 1 V
    B-3 (SH2) - Body ground
    		Heater output signal
    		Power switch on (IG), Outer mirror switch (Heated steering wheel switch) on
    		11 to 14 V*2
    B-4 (SH1) - Body ground
    		Heater ground
    		Power switch on (IG), Outer mirror switch (Heated steering wheel switch) on
    		Below 1 V

    HINT:
    1. *1: When ambient temperature is 0 to 40°C (32 to 104°F).
    2. *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.