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 2 Connectors |
- |
- |
*1 |
Main Body ECU (Multiplex Network Body ECU) |
- |
- |
*a |
2 Connectors |
- |
- |
*A |
Main Body ECU (Multiplex Network Body ECU) with 1 Connector |
- |
- |
*1 |
Main Body ECU (Multiplex Network Body ECU) |
- |
- |
*a |
1 Connector |
- |
- |
(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
(b) 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 |
---|---|---|---|---|
3F-1 - Body ground |
W - Body ground |
Battery power supply |
Always |
11 to 14 V |
3K-1 - Body ground |
B-R - 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.
(c) 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 |
---|---|---|---|---|
3D-3 - 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.
(d) Reconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
(e) 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 |
---|---|---|---|---|
3F-31 - Body ground |
G - Body ground |
H-LP LH relay drive output |
Ignition switch off |
11 to 14 V |
Ignition switch ON |
Below 1 V |
|||
F15-1 (DIM) - Body ground |
Y - Body ground |
H-LP RH relay drive output |
Ignition switch off |
11 to 14 V |
Ignition switch ON |
Below 1 V |
|||
F15-8 (A) - Body ground |
W - 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 |
|||
F15-12 (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 |
Pulse generation |
|||
F15-17 (AHBI) - Body ground |
Y - Body ground |
Auto high beam switch signal input |
Ignition switch on, auto high beam switch off |
11 to 14 V |
Ignition switch on, auto high beam switch on |
Below 1 V |
|||
F15-19 (CLTB) - F15-21 (CLTE) |
G - V |
Automatic light control sensor power supply output |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
F15-20 (CLTS) -Body ground |
BE - Body ground |
Automatic lightcontrol sensor signalinput |
Ignition switch off |
Below 1 V |
Automatic lightcontrol systemoperating |
Communicationwaveformgeneration(See waveform 1) |
|||
F15-20 (CLTS) - Body ground |
BE - Body ground |
Automatic light control sensor signal input |
Ignition switch off |
Below 1 V |
Automatic light control system operating |
Communication waveform generation (See waveform 1) |
|||
F15-24 (HU) - Body ground |
GR - Body ground |
Dimmer switch high position signal input |
Dimmer switch in high position |
Below 1 V |
Dimmer switch not in high position |
Pulse generation |
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. |
HINT:
The communication waveform changes according to the surrounding brightness.
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for LED Headlight)
Click here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for LED Headlight)
Click here
CHECK FORWARD RECOGNITION CAMERA
Click here
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