LIGHTING SYSTEM TERMINALS OF ECU

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*A	Main Body ECU (Multiplex Network Body ECU) with 1 Connector	-	-
*1	Main Body ECU (Multiplex Network Body ECU)	-	-
*a	1 Connector	-	-

*A	Main Body ECU (Multiplex Network Body ECU) with 2 Connectors	-	-
*1	Main Body ECU (Multiplex Network Body ECU)	-	-
*a	2 Connectors	-	-

1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   3A-43 (BECU) - Body ground	G - Body ground	Battery power supply	Always	11 to 14 V
   3B-1 - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V

   If the result is not as specified, there may be a malfunction in the wire harness.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   3D-12 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   If the result is not as specified, there may be a malfunction in the wire harness.

4. Reconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

5. Measure the voltage and check for pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   3A-7 - Body ground	G - Body ground	Clearance light RH drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   3A-8 - Body ground	G - Body ground	Clearance light LH drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   3E-17 - Body ground	G - Body ground	Taillight RH drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   3E-32 - Body ground	G - Body ground	Taillight LH drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   3A-35 (HRLY) - Body ground	B - Body ground*1 V - Body ground*2	Headlight relay drive output	Light control switch in head position	Below 1 V
   			Light control switch not in head position	11 to 14 V
   3A-53 (DRL) - Body ground*6	P - Body ground	Daytime running light system drive output	Daytime running light system operating	Below 1 V
   			Daytime running light system not operating	11 to 14 V
   3E-40 - Body ground*5	SB - Body ground	Rear fog light drive output	Light control switch in tail or head position, fog light switch in rear position	11 to 14 V
   			Light control switch in tail or head position, fog light switch off	Below 1 V
   3D-10 - Body ground*3	G - Body ground	Front fog light drive output	Always	11 to 14 V
   3C-43 (FFGO) - Body ground*3	L - Body ground	Front fog light relay drive output	Light control switch in tail or head position, fog light switch in front position	Below 1 V
   			Light control switch in tail or head position, fog light switch off	11 to 14 V
   3A-54 (DIM) - Body ground	LG - Body ground	High beam headlight drive output	Dimmer switch in high or high flash position	Below 1 V
   			Dimmer switch in low position	11 to 14 V
   3D-47 - Body ground*3	L - Body ground	Front fog relay power supply output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   3E-27 - Body ground	B - Body ground	Parking brake switch input	Parking brake switch on	Below 1 V
   			Parking brake switch off	11 to 14 V
   E22-5 (HU) - Body ground	P - Body ground	Dimmer switch high position signal input	Dimmer switch in high position	Below 1 V
   			Dimmer switch not in high position	Pulse generation
   E22-8 (HF) - Body ground	R - Body ground	Dimmer switch high flash position signal input	Dimmer switch in high flash position	Below 1 V
   			Dimmer switch not in high flash position	Pulse generation
   E22-20 (CLTB) - E22-22 (CLTE)*4	W - V	Automatic light control sensor power supply output	Ignition switch off	Below 1 V
   			Ignition switch ON	11 to 14 V
   E22-21 (CLTS) - Body ground*4	Y - Body ground	Automatic light control sensor signal input	Ignition switch off	Below 1 V
   			Automatic light control system operating	Pulse generation (See waveform 1)
   E22-1 (RFOG) - Body ground*5	SB - Body ground	Fog light switch rear position input	Fog light switch in rear position	Below 1 V
   			Fog light switch off	Pulse generation
   E22-27 (FFOG) - Body ground*3	G - Body ground	Fog light switch front position input	Fog light switch in front position	Below 1 V
   			Fog light switch off	Pulse generation
   E22-28 (A) - Body ground*4	V - Body ground	Light control switch AUTO position signal input	Light control switch in AUTO position	Below 1 V
   			Light control switch not in AUTO position	Pulse generation
   E22-29 (HEAD) - Body ground	L - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
   			Light control switch not in head position, ignition switch off	Pulse generation
   E22-30 (TAIL) - Body ground	W - Body ground	Light control switch tail position signal input	Light control switch in tail or head position	Below 1 V
   			Light control switch not in tail or head position, ignition switch off	Pulse generation
   E108-21 (RLEW) - Body ground*7	Y - Body ground	LED headlight RH signal input	Headlight dimmer switch off	Below 1 V
   			Headlight dimmer switch in head position	Pulse generation
   E108-24 (LLEW) - Body ground*7	G - Body ground	LED headlight LH signal input	Headlight dimmer switch off	Below 1 V
   			Headlight dimmer switch in head position	Pulse generation

   • *1: w/ Headlight Cleaner

   • *2: w/o Headlight Cleaner

   • *3: w/ Front Fog Light

   • *4: w/ Automatic Light Control

   • *5: w/ Rear Fog Light

   • *6: w/ Daytime Running Light

   • *7: for Sedan LED Headlight

   If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

   1. 

      Waveform 1

      Item	Content
      Tool setting	5 V/DIV., 5 ms./DIV.

      Tip:

      If the ambient light becomes brighter, width A becomes narrower.

CHECK COMBINATION METER ASSEMBLY

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CHECK HEADLIGHT SWIVEL ECU ASSEMBLY (except Sedan)

1. Measure the voltage and check for pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A93-6 (INL) - Body ground	P - Body ground	LED headlight LH operation signal input	Ignition switch ON, light control switch off	4.5 to 5.5 V
   			Ignition switch ON, light control switch in head position	Pulse generation
   A93-7 (INR) - Body ground	G - Body ground	LED headlight RH operation signal input	Ignition switch ON, light control switch off	4.5 to 5.5 V
   			Ignition switch ON, light control switch in head position	Pulse generation

   • If the result is not as specified, the headlight swivel ECU assembly may be malfunctioning.