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) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
Click here
(b) Reconnect the instrument panel junction block assembly connectors.
(c) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
MB-31 (BECU) - Body ground |
- |
Battery power supply |
Always |
11 to 14 V |
MB-32 (IG) - Body ground |
- |
Ignition power supply (IG signal) |
Ignition switch off |
Below 1 V |
Ignition switch ON |
11 to 14 V |
|||
MB-30 (ACC) - Body ground |
- |
Ignition power supply (ACC signal) |
Ignition switch off |
Below 1 V |
Ignition switch ACC |
11 to 14 V |
|||
MB-11 (GND1) - Body ground |
- |
Ground |
Always |
Below 1 Ω |
F15-6 (FLCY) - Body ground |
R - Body ground |
Front door courtesy light switch assembly LH input |
Front door LH closed |
10 kΩ or higher |
Front door LH open |
Below 1 Ω |
|||
F15-27 (FRCY) - Body ground |
BR - Body ground |
Front door courtesy light switch assembly RH input |
Front door RH closed |
10 kΩ or higher |
Front door RH open |
Below 1 Ω |
|||
MB-13 (LCTY) - Body ground |
- |
Rear door courtesy light switch assembly LH input |
Rear door LH closed |
10 kΩ or higher |
Rear door LH open |
Below 1 Ω |
|||
MB-2 (RCTY) - Body ground |
- |
Rear door courtesy light switch assembly RH input |
Rear door RH closed |
10 kΩ or higher |
Rear door RH open |
Below 1 Ω |
|||
MB-4 (BCTY) - Body ground |
- |
Back door courtesy light switch input |
Back door closed |
10 kΩ or higher |
Back door open |
Below 1 Ω |
|||
F15-11 (HCTY) - Body ground |
GR - Body ground |
Hood courtesy switch input |
Hood open |
10 kΩ or higher |
Hood closed |
Below 1 Ω |
|||
MB-3 (KSW) - Body ground*1 |
- |
Unlock warning switch signal |
No key in ignition key cylinder |
10 kΩ or higher |
Key in ignition key cylinder |
Below 1 Ω |
(d) Install the main body ECU (multiplex network body ECU) to instrument panel junction block assembly.
Click here
(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 |
---|---|---|---|---|
3D-13 (LSFL) - Body ground |
B - Body ground |
Front door LH unlock detection switch input |
Front door LH unlocked |
Below 1 V |
Front door LH locked |
Pulse generation |
|||
3D-12 (LSFR) - Body ground |
GR - Body ground |
Front door RH unlock detection switch input |
Front door RH unlocked |
Below 1 V |
Front door RH locked |
Pulse generation |
|||
F15-29 (L2) - Body ground |
G - Body ground |
Driver door key-linked lock input |
Driver door key cylinder turned to lock position |
Below 1 V |
Driver door key cylinder off |
Pulse generation |
|||
F15-2 (UL3) - Body ground |
L - Body ground |
Driver door key-linked unlock input |
Driver door key cylinder turned to unlock position |
Below 1 V |
Driver door key cylinder off |
Pulse generation |
|||
3D-14 (LSR) - Body ground |
LG - Body ground |
Rear door LH and Rear door RH unlock detection switch input |
Rear door LH or Rear door RH unlocked |
Below 1 V |
Rear door LH and Rear door RH locked |
Pulse generation |
|||
3A-20 (SH) - Body ground |
LG - Body ground |
Security horn assembly drive |
Security horn assembly sounding (Theft deterrent system in alarm sounding state) |
Pulse generation (Below 1 V ← → 11 to 14 V) |
3F-27 (HORN) - Body ground |
SB - Body ground |
Vehicle horns drive |
Vehicle horns sounding (Theft deterrent system in alarm sounding state) |
Pulse generation (Below 1 V ← → 11 to 14 V) |
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PROCEDURE
1.
CHECK PANEL SWITCH
(a) Check for foreign matter around the switches that might prevent operation.
OK:
No foreign matter is found.
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
NG
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