METER / GAUGE SYSTEM > TERMINALS OF ECU

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   E46-1 (WRNP) - Body ground	BE*1 or W*2 - Body ground	Front passenger side seat belt warning light signal	Front passenger seat occupied, ignition switch ON, front passenger side seat belt warning light OFF	11 to 14 V
   			Front passenger seat occupied, ignition switch ON, front passenger side seat belt warning light is blinking	Below 1 V ←→ 11 to 14 V
   E46-2 (WLVL)*3 - Body ground	BE - Body ground	Washer level warning light signal	Ignition switch ON, washer level warning light OFF	11 to 14 V
   			Ignition switch ON, washer level warning light ON	Below 1 V
   E46-3 (-) - Body ground	L*2 or *5, W-B*6 - Body ground	Headlight Hi-beam indicator light signal	Always	Below 1 V
   E46-4 (+) - Body ground	R - Body ground	Headlight Hi-beam indicator light signal	Hi-beam switch OFF	11 to 14 V
   			Hi-beam switch ON	Below 1 V
   E46-5 (B) - Body ground	L - Body ground	Turn indicator light signal	Ignition switch ON, turn signal RH indicator light OFF	Below 1 V
   			Ignition switch ON, turn signal RH indicator light ON	11 to 14 V
   E46-6 (B) - Body ground	Y - Body ground	Turn indicator light signal	Ignition switch ON, turn signal LH indicator light OFF	Below 1 V
   			Ignition switch ON, turn signal LH indicator light ON	11 to 14 V
   E46-7 (TIRE) - Body ground	P - Body ground	Tire pressure warning light signal	Ignition switch ON, tire pressure warning light OFF	3.2 V or more
   			Ignition switch ON, tire pressure warning light ON	0.9 to 3.2 V
   E46-9 (TX1+) - Body ground	G*1 or LG*2 - Body ground	Outside temperature signal	Ignition switch ON	5 V or less
   E46-10 (E) - Body ground	BR - Body ground	Ground (Fuel ground)	Always	Below 1 V
   E46-11 (EP) - Body ground	W-B - Body ground	Ground (Illumination ground)	Always	Below 1 V
   E46-13 (TX-)*7 - Body ground	W - Body ground	CAN communication signal	Ignition switch ON	Pulse generation
   E46-14 (TX1-)*7 - Body ground	G - Body ground	CAN communication signal	Ignition switch ON	Pulse generation
   E46-16 (FOG)*4 - Body ground	P - Body ground	Front fog indicator light signal	Front fog light switch off, front fog indicator light OFF	Below 1 V
   			Front fog light switch on, front fog indicator light ON	11 to 14 V
   E46-20 (EFI) - Body ground	P*1 or R*2 - Body ground	MIL (Check engine warning light) signal	Ignition switch ON, MIL OFF	11 to 14 V
   			Ignition switch ON, MIL ON	Below 3 V
   E46-23 (TEMP) - Body ground	W*1 or GR*2 - Body ground	Outside temperature signal	Ignition switch ON, outside temperature 25°C (77°F)	Approximately 1.3 V
   E46-24 (ILL+) - Body ground	V*1 or G*2 - Body ground	Tail indicator light signal	Headlight dimmer switch off, tail indicator light OFF	Below 1 V
   			Headlight dimmer switch is at the TAIL position, tail indicator light ON	11 to 14 V
   E46-25 (L) - Body ground	Y*1 or P*2 - Body ground	Fuel signal	Ignition switch ON, fuel level is EMPTY	3 to 7 V
   			Ignition switch ON, fuel level is FULL	Below 1 V
   E46-26 (ILL-) - Body ground	V*5 or W*2 - Body ground	Illumination signal	Ignition switch ON, headlight dimmer switch OFF	Below 1 V
   			Ignition switch ON, headlight dimmer switch is at the TAIL or HEAD position	Below 1 V ←→ 11 to 14 V
   E46-27 (CANH) - E46-28 (CANL)	G - W	CAN communication signal	Ignition switch ON	Pulse generation
   E46-28 (CANL) - E46-27 (CANH)	W - G	CAN communication signal	Ignition switch ON	Pulse generation
   E46-29 (ILL-) - Body ground	BE*5 or W*2 - Body ground	Illumination signal	Ignition switch ON, headlight dimmer switch OFF	Below 1 V
   			Ignition switch ON, headlight dimmer switch TAIL or HEAD position	Below 1 V ←→ 11 to 14 V
   E46-30 (ET) - Body ground	BR*1 or W-B*2 - Body ground	Ground (Signal ground)	Always	Below 1 V
   E46-32 (B) - Body ground	W*1 or R*2 - Body ground	Battery	Always	11 to 14 V
   E46-33 (IG+) - Body ground	P*1 or B*2 - Body ground	Ignition switch signal	Ignition switch off	Below 1 V
   			Ignition switch ON	11 to 14 V
   E46-35 (SI) - Body ground	V*1 or LG*2 - Body ground	Speed signal for other systems (Input)	Ignition switch ON, wheel turned slowly	Pulse generation (See waveform)
   E46-36 (+S) - Body ground	V - Body ground	Speed signal for other systems (Output)	Wheel turned slowly	Pulse generation (See waveform)
   E46-38 (S) - Body ground	Y*1 or G*2 - Body ground	Engine oil pressure warning light signal	Ignition switch ON, engine oil pressure warning light OFF	11 to 14 V
   			Ignition switch ON, engine oil pressure warning light ON	Below 1 V
   E46-39 (CHG-) - Body ground	Y - Body ground	Charge warning light signal	Ignition switch ON, charge warning light OFF	11 to 14 V
   			Ignition switch ON, charge warning light ON	Below 1 V
   E46-40 (SW) - Body ground	Y*1 or BE*2 - Body ground	Brake fluid level warning light signal	Ignition switch ON, brake warning light OFF	11 to 14 V
   			Ignition switch ON, brake warning light ON	Below 1 V

   1. *1: for TMC Made
      
   2. *2: except TMC Made
      
   3. *3: w/ Washer Level Warning Light
      
   4. *4: w/ Front Fog Light
      
   5. *5: for TMC Made w/ DRL
      
   6. *6: for TMC Made w/o DRL
      
   7. *7: w/ Smart Key System
      




2. Waveform (Reference): Using oscilloscope:
   

   Item	Condition
   Tool setting	5 V/DIV., 20 ms./DIV.
   Vehicle condition	Driving at approximately 12 mph (20 km/h)

   HINT:

   1. Vehicle speed signal that has been received and transmitted via the direct line is used for another system, and is not used for combination meter operation.
      
   2. When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
      

   HINT:

   When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

1. Combination Meter Inner Circuit
   

   
   
   
   
   
   
   
   
   
   
   
   
   

   Terminal No.		Wire Harness Side (Symbol)
   E46	1	Telltale Light Assembly (WRNP)
   	2	Washer Level Warning Switch (WLVL)*1
   	3	DRL Relay (-)
   	4	H-LP RH HI Fuse (+)
   	5	Turn Signal Flasher (B)
   	6	Turn Signal Flasher (B)
   	7	Tire Pressure Warning ECU (TIRE)
   	8	-
   	9	Outside Temperature Sensor (TX1+)
   	10	Fuel Sender Gauge Assembly (E)
   	11	Ground (EP)
   	12	-
   	13	CAN Communication Line (TX-)*3
   	14	CAN Communication Line (TX1-)*3
   	15	-
   	16	FR FOG Relay (FOG)*2
   	17	-
   	18	-
   	19	-
   	20	ECM (EFI)
   	21	-
   	22	-
   	23	Outside Temperature Sensor (TEMP)
   	24	TAIL Fuse (ILL+)
   	25	Fuel Sender Gauge Assembly (L)
   	26	Each part that uses the illumination signal (ILL-)
   	27	CAN Communication Line (CANH)
   	28	CAN Communication Line (CANL)
   	29	Each part that uses the illumination signal (ILL-)
   	30	Ground (ET)
   	31	-
   	32	ECU-B Fuse (B)
   	33	METER Fuse (IG+)
   	34	-
   	35	Skid Control ECU (SI)
   	36	Each part that uses the speed signal (+S)
   	37	-
   	38	Oil Pressure Switch (S)
   	39	Alternator L Terminal (CHG-)
   	40	Brake Fluid Level Warning Switch (SW)

   1. *1: w/ Washer Level Warning Light
      
   2. *2: w/ Front Fog Light
      
   3. *3: w/ Smart Key System
      

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   E124-1 (B) - Body ground	V - Body ground	Battery	Ignition switch OFF	11 to 14 V
   E124-2 (ACC) - Body ground	GR - Body ground	Ignition switch (ACC) signal	Ignition switch OFF	Below 1 V
   			Ignition switch ON (ACC)	11 to 14 V
   E124-4 (ILL+) - Body ground	G - Body ground	Illumination signal	Ignition switch ON and light control switch off	Below 1 V
   			Ignition switch ON and light control switch tail or head position	4 to 6 V
   E124-12 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   E48-1 (B) - Body ground	W - Body ground	Battery	Ignition switch OFF	11 to 14 V
   E48-2 (ACC) - Body ground	GR - Body ground	Ignition switch (ACC) signal	Ignition switch OFF	Below 1 V
   			Ignition switch ON (ACC)	11 to 14 V
   E48-4 (ILL+) - Body ground	G - Body ground	Illumination signal	Ignition switch ON and light control switch off	Below 1 V
   			Ignition switch ON and light control switch tail or head position	4 to 6 V
   E48-12 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   I125-1 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   I125-5 (ILL+) - Body ground	G - Body ground	Illumination signal	Light control switch off	Below 1 V
   			Light control switch TAIL or HEAD	11 to 14 V
   I125-6 (ACC) - Body ground	GR - Body ground	Ignition switch signal	Ignition switch off	Below 1 V
   			Ignition switch ON (ACC)	11 to 14 V
   I125-7 (B) - Body ground	W - Body ground	Battery	Always	11 to 14 V