LIGHTING SYSTEM TERMINALS OF ECU

CHECK COMBINATION METER ASSEMBLY

1. Disconnect the E12 and E13 combination meter assembly 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
   E12-40 (B) - Body ground	L - Body ground	Battery power supply	Always	11 to 14 V
   E13-3 (B) - Body ground	G - Body ground	Battery power supply	Always	11 to 14 V
   E12-39 (IG+) - Body ground	P - Body ground	Ignition power supply	Ignition switch ON	11 to 14 V

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

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
   E12-38 (ET) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

4. Reconnect the E12 and E13 combination meter assembly connectors.

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

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   E12-1 (HAZ) - Body ground	G - Body ground	Hazard warning signal switch input signal	Hazard warning signal switch on	Below 1 V
   			Hazard warning signal switch off	11 to 14 V
   E12-2 (EL) - Body ground	B - Body ground	Turn signal switch left turn input signal	Ignition switch ON, turn signal switch not in left turn position	11 to 14 V
   			Ignition switch ON, turn signal switch in left turn position	Below 1 V
   E12-3 (ER) - Body ground	Y - Body ground	Turn signal switch right turn input signal	Ignition switch ON, turn signal switch not in right turn position	11 to 14 V
   			Ignition switch ON, turn signal switch in right turn position	Below 1 V
   E12-6 (DRLE) - Body ground	P - Body ground	Daytime running light relay drive output signal	Ignition switch ON, light control switch in tail or head position	11 to 14 V
   			Ignition switch ON, light control switch off	Below 1 V
   E12-30 (SW) - Body ground	L - Body ground	Turn signal switch full turn input signal	Ignition switch ON, turn signal switch not in full left turn and full right turn position	11 to 14 V
   			Ignition switch ON, turn signal switch in full left turn or full right turn position	Below 1 V
   E13-4 (LL) - Body ground	Y - Body ground	Turn signal light output signal	Ignition switch ON, turn signal switch in left turn position	Alternating between 11 to 14 V and below 1 V (60 to 120 times per minute)
   			Ignition switch ON, turn signal switch not in left turn position	Below 1 V
   E13-5 (LR) - Body ground	W - Body ground	Turn signal light output signal	Ignition switch ON, turn signal switch in right turn position	Alternating between 11 to 14 V and below 1 V (60 to 120 times per minute)
   			Ignition switch ON, turn signal switch not in right turn position	Below 1 V

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (w/ Automatic Light Control or w/ Entry and Start System)

*1

Driver Side Junction Block Assembly

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*1

Main Body ECU (Multiplex Network Body ECU)

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1. Disconnect the driver side 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
   3J-2 - Body ground	GR - Body ground	Battery power supply	Always	11 to 14 V
   3D-4 - Body ground	L - Body ground	IG power supply	Ignition switch ON	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
   3J-7 (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 driver side 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
   3D-8 - Body ground*	B - 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
   3P-6 - Body ground	P - 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
   3Q-4 - Body ground	GR - Body ground	Headlight relay drive output	Light control switch in head position	Below 1 V
   			Light control switch not in head position	11 to 14 V
   3Q-6 - Body ground	W - Body ground	Rear fog light relay drive output	Light control switch in tail or head position, fog light switch in rear position	Below 1 V
   			Light control switch in tail or head position, fog light switch off	11 to 14 V
   E45-1 (TRLY) - Body ground	GR - Body ground	Taillight relay drive output	Light control switch in tail or head position	Below 1 V
   			Light control switch in off position	11 to 14 V
   E45-5 (CLTB) - E45-3 (CLTE)	SB - BE	Automatic light control sensor power supply output	Ignition switch off	Below 1 V
   			Ignition switch ON, light control switch in AUTO position	11 to 14 V
   E45-4 (CLTS) - Body ground	W - Body ground	Automatic light control sensor signal input	Ignition switch off	Below 1 V
   			Ignition switch ON, automatic light control system operating	Pulse generation (See waveform 1)
   E45-6 (A) - Body ground	R - 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
   E45-7 (TAIL) - Body ground	BE - 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
   E45-8 (HEAD) - Body ground	B - 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
   E45-9 (RFOG) - Body ground	B - Body ground	Fog light switch rear position signal input	Fog light switch in rear position	Below 1 V
   			Fog light switch off	Pulse generation
   E45-10 (FFOG) - Body ground*	G - Body ground	Fog light switch front position signal input	Fog light switch in front position	Below 1 V
   			Fog light switch off	Pulse generation
   E45-13 (HF) - Body ground	P - 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
   E45-14 (HU) - Body ground	LG - Body ground	Dimmer switch high position signal input	Dimmer switch in high position	Below 1 V
   			Dimmer switch not in high position	Pulse generation

   • *: w/ Front Fog Light

   If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side 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.