Lighting System Terminals Of Ecu

Disconnect the E91 relay connector.

Measure the voltage between the specified terminals of the wire harness side connectors and body ground.

Standard Voltage:

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E91-12 (IG) - Body ground	L - Body ground	IG power supply	Ignition switch off	Below 1 V
			Ignition switch ON	11 to 14 V
E91-1 (+B) - Body ground	W*1 - Body ground R*2 - Body ground	Battery power supply	Always	11 to 14 V

1. *1: for TMC Made
   
2. *2: except TMC Made
   

Measure the resistance between the specified terminals of the wire harness side connectors and body ground.

Standard Resistance:

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E91-11 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

Reconnect the E91 relay connector.

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

Standard Resistance:

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E91-9 (PKB) - Body ground	BE - Body ground	Parking brake switch signal	Parking brake switch OFF	10 kΩ or higher
			Parking brake switch ON	Below 1 Ω
E91-18 (CSE) - Body ground(*1,*2)	G - Body ground	Ground	Always	Below 1 Ω

1. *1: w/ Automatic Light Control Sensor
   
2. *2: except TMC Made
   

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

Standard Voltage:

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
E91-10 (DRL) - Body ground	R*1 - Body ground BR*2 - Body ground	Daytime running light drive output	Daytime running lights OFF	Below 1 V
			Daytime running lights ON	Pulse generation (See waveform 1)
E91-2 (FOG) - Body ground	W - Body ground	Front fog relay drive output	Front fog light switch ON and light control switch OFF	11 to 14 V
			Front fog light switch ON and light control switch in HEAD	Below 1 V
E91-4 (H-LP) - Body ground	B*1 - Body ground V*2 - Body ground	Low beam headlight relay drive output	Low beam headlights ON	Below 1 V
			Low beam headlights OFF	11 to 14 V
E91-5 (H) - Body ground	G - Body ground	Light control switch HEAD signal input	Light control switch in HEAD	Below 1 V
			Light control switch not in HEAD	11 to 14 V
E91-6 (CHG-) - Body ground	Y - Body ground	Engine revolution signal input	Engine running	11 to 16 V
			Engine stopped	Below 1 V
E91-8 (HF) - Body ground	B - Body ground	Dimmer switch HIGH FLASH signal input	Dimmer switch in HIGH FLASH position	Below 1 V
			Dimmer switch not in HIGH FLASH position	11 to 14 V
E91-13 (DIM) - Body ground	P - Body ground	High beam headlight relay drive output	High beam headlights ON or daytime running lights ON	Below 1 V
			High beam headlights and daytime running lights OFF	11 to 14 V
E91-14 (TAIL) - Body ground	W*1 - Body ground SB*2 - Body ground	Taillight relay drive output	Taillights ON	Below 1 V
			Taillights OFF	11 to 14 V
E91-15 (T) - Body ground	W*1 - Body ground BR*2 - Body ground	Light control switch TAIL signal input	Light control switch in TAIL or HEAD	Below 1 V
			Light control switch in neither TAIL nor HEAD	11 to 14 V
E91-16 (HI) - Body ground	LG - Body ground	Dimmer switch HIGH signal input	Dimmer switch in HIGH	Below 1 V
			Dimmer switch in LOW	11 to 14 V
E91-17 (H-ON) - Body ground	L - Body ground	High beam headlight indicator drive output	High beam headlight indicator ON	Below 1 V
			High beam headlight indicator OFF	Below 1 V
E91-19 (CSO) - Body ground(*2,*3)	SB - Body ground	Automatic light control sensor signal input	Ignition switch off	Below 1 V
			Ignition switch ON	Pulse generation (See waveform 2)
E91-20 (CSB) - Body ground(*2,*3)	GR - Body ground	Automatic light control sensor power supply output	Ignition switch off	Below 1 V
			Ignition switch ON	11 to 14 V

1. *1: for TMC Made
   
2. *2: except TMC Made
   
3. *3: w/ Automatic Light Control Sensor
   

1. Waveform 1
   

   Item	Content
   Tool setting	5 V/DIV., 20 ms./DIV.





2. Waveform 2
   

   Item	Content
   Tool setting	2 V/DIV., 5 ms./DIV.

   HINT:

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