Lexus IS250 IS220d GSE20 ALE20 - HEATER

COMBUSTION TYPE POWER HEATER SYSTEM - TERMINALS OF ECU

• Standard:

• Tester No. (Symbols)	Wiring Color	Condition	Specified Condition
  A51-1 (E) - Body ground	W-B - Body ground	Always	Below 1 V
  A51-2 (L) - Body ground	L - Body ground	Engine switch: on (IG) Power heater switch: ON	Pulse generation (See waveform 1)
  A51-3 (IG) - Body ground	L-W - Body ground	Engine switch: on (IG) Power heater switch: ON	10 to 14 V
  A51-5 (B) - Body ground	B - Body ground	Always	10 to 14 V
  A51-8 (+) - Body ground	B - Body ground	Engine is running. (Alternator: Operate)	10 to 14 V

Waveform 1:

Item	Contents
Terminal No. (Symbols)	A51-2 (L) - Body ground
Tool Setting	2 V/DIV., 20 ms/DIV.
Vehicle Condition	Engine switch: on (IG) Power heater switch: ON