Lexus LX - Heated Steering Wheel System Terminals of ECU; CHECK HEATED STEERING WHEEL CONTROLLER

HEATED STEERING WHEEL SYSTEM > TERMINALS OF ECU
for Preparation Click here
CHECK HEATED STEERING WHEEL CONTROLLER
HINT:
Inspect the connectors from the back side while the connectors are connected.
a. Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) 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),
Steering heater switch
on
Below 3 V
A-2 (CCV) - A-3 (CCX) G - GR
Heated steering wheel
switch input signal
Engine switch on (IG),
Steering heater switch
pressed and held
10 to 14 V
B-3 (TH1) - A-3 (CCX) G - GR Thermistor input signal
Engine switch on (IG),
Steering heater 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),
Steering heater switch
on
Below 1 V
B-4 (SH1) - A-3 (CCX) R - GR Heater ground
Engine switch on (IG),
Steering heater switch
on
Below 1 V
B-2 (SH2) - A-3 (CCX) B - GR Heater output signal
Engine switch on (IG),
Steering heater 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.