LIGHTING SYSTEM TERMINALS OF ECU

*1

Main Body ECU (Multiplex Network Body ECU)

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

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

2. Measure the voltage on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   4F-1 - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V
   4E-1 - Body ground	B - 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 on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   4B-7 - 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
   4D-28 - Body ground	V - Body ground	Taillight drive output	Light control switch in tail or head position	11 to 14 V
   			Light control switch off	Below 1 V
   4C-29 - Body ground	R - Body ground	H-LP LH relay drive output	Light control switch in tail or head position	Below 1 V
   			Light control switch off	11 to 14 V
   4D-12 - Body ground*3	BE - 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
   O2-1 (DIM) - Body ground	V - Body ground	H-LP RH/MIR HTR relay drive output*1 H-LP RH relay drive output*2	Light control switch in tail or head position	Below 1 V
   			Light control switch off	11 to 14 V
   4C-15 - Body ground	GR - Body ground	Parking brake switch input	Parking brake switch on	Below 1 V
   			Parking brake switch off	11 to 14 V
   O2-24 (HU) - Body ground	V - Body ground	Dimmer switch high position signal input	Dimmer switch in high position	Below 1 V
   			Dimmer switch not in high position	Pulse generation
   O2-10 (HF) - Body ground	L - 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
   O2-19 (CLTB) - O2-21 (CLTE)	GR - W	Automatic light control sensor power supply output	Engine switch off	Below 1 V
   			Engine switch on (IG), light control switch in AUTO position	11 to 14 V
   O-20 (CLTS) - Body ground	R - Body ground	Automatic light control sensor signal input	Engine switch off	Below 1 V
   			Automatic light control system operating	Communication waveform generation (See waveform 1)
   O2-23 (RFOG) - Body ground*3	P - Body ground	Fog light switch rear position input	Fog light switch in rear position	Below 1 V
   			Fog light switch off	Pulse generation
   O2-8 (A) - Body ground	P - 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
   O2-12 (HEAD) - Body ground	Y - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
   			Light control switch not in head position	Pulse generation
   O2-22 (TAIL) - Body ground	B - 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	Pulse generation
   O1-4 (MILE) - Body ground	LG - Body ground	Outside handle foot lights drive output	Outside handle foot light illuminate	11 to 14 V
   			Outside handle foot light off	Below 3 V

   
   

   • *1: for LHD

   • *2: for RHD

   • *3: w/ Rear Fog Light

   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	2 V/DIV., 10 ms./DIV.

      Tip:

      The communication waveform changes according to the surrounding brightness.

CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH

1. Disconnect the A3 headlight light control ECU sub-assembly LH connector.

2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A3-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A3-13 (ECUB) - Body ground	W - Body ground	Battery power supply	Light control switch off	Below 1 V
   			Light control switch in tail or head position	11 to 14 V
   A3-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

3. Reconnect the A3 headlight light control ECU sub-assembly LH connector.

   Tip:

   Since the headlight light control ECU sub-assembly LH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A3-8 (RLD2) - Body ground	G - Body ground	Daytime running light/clearance light drive output	Daytime running light or clearance light on	Below 1 V
   			Daytime running light and clearance light off	Pulse generation
   A3-11 (TNS) - Body ground	G - Body ground	LH turn signal light signal input	Engine switch on (IG), LH turn signal light off	Below 1 V
   			Engine switch on (IG), LH turn signal light blinking	11 to 14 V ←→ Below 1 V
   A3-16 (SBR) - A3-15 (SGR)	GR - LG	Rear height control sensor power supply	Engine switch on (IG)	4.75 to 5.25 V
   A3-17 (SHRL) - A3-15 (SGR)	G - LG	Rear height control sensor signal input	Engine switch on (IG), vehicle unloaded, vehicle stopped	Approximately 2.5 V (value decreases as the front of the vehicle is raised)
   A3-20 (LINL) - Body ground	LG - Body ground	LIN communication	Engine switch on (IG)	Pulse generation

CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH

1. Disconnect the A11 headlight light control ECU sub-assembly RH connector.

2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A11-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A11-13 (ECUB) - Body ground	B - Body ground	Battery power supply	Light control switch off	Below 1 V
   			Light control switch in tail or head position	11 to 14 V
   A11-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

3. Reconnect the A11 headlight light control ECU sub-assembly RH connector.

   Tip:

   Since the headlight light control ECU sub-assembly RH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A11-8 (RLD2) - Body ground	G - Body ground	Daytime running light/clearance light drive output	Daytime running light or clearance light on	Below 1 V
   			Daytime running light and clearance light off	Pulse generation
   A11-11 (TNS) - Body ground	R - Body ground	RH turn signal light signal input	Engine switch on (IG), RH turn signal light off	Below 1 V
   			Engine switch on (IG), RH turn signal light blinking	11 to 14 V ←→ Below 1 V
   A11-20 (LINL) - Body ground	LG - Body ground	LIN communication	Engine switch on (IG)	Pulse generation