TERMINALS OF ECU
1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the MB main body ECU (multiplex network body ECU) connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connectors disconnected.
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
MB-11(GND1) - Body ground |
- |
Ground |
Always |
Below 1 Ω |
MB-31 (BECU) - Body ground |
- |
Battery power supply |
Always |
11 to 14 V |
MB-30 (ACC) - Body ground |
- |
ACC power supply |
Ignition switch ACC |
11 to 14 V |
MB-30 (ACC) - Body ground |
- |
ACC power supply |
Ignition switch off |
Below 1 V |
MB-32 (IG) - Body ground |
- |
IG power supply |
Ignition switch ON |
11 to 14 V |
MB-32 (IG) - Body ground |
- |
IG power supply |
Ignition switch off |
Below 1 V |
If the result is not as specified, there may be a malfunction in the wire harness.
(c) Reconnect the MB main body ECU (multiplex network body ECU) connectors.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
Tester Connection |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
1D-1 (ACT+) - Body ground |
R - Body ground |
Door lock motor unlock drive output (except driver door) |
Door control switch (power window regulator master switch assembly) or driver door key cylinder off |
Below 1 V |
Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked |
11 to 14 V |
|||
1H-12 (ACT+) - Body ground |
LA-R - Body ground |
Door lock motor unlock drive output (except driver door) |
Door control switch (power window regulator master switch assembly) or driver door key cylinder off |
Below 1 V |
Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked |
11 to 14 V |
|||
1H-10 (ACT-) - Body ground |
LA-G - Body ground |
Door lock motor lock drive output (all doors) |
Door control switch (power window regulator master switch assembly) or driver door key cylinder off |
Below 1 V |
Door control switch (power window regulator master switch assembly) or driver door key cylinder locked |
11 to 14 V |
|||
1D-3 (ACT-) - Body ground |
G - Body ground |
Door lock motor lock drive output (all doors) |
Door control switch (power window regulator master switch assembly) or driver door key cylinder off |
Below 1 V |
Door control switch (power window regulator master switch assembly) or driver door key cylinder locked |
11 to 14 V |
|||
1D-2 (ACTD) - Body ground |
B - Body ground |
Driver door lock motor unlock drive output |
Door control switch (power window regulator master switch assembly) or driver door key cylinder off |
Below 1 V |
Door control switch (power window regulator master switch assembly) or driver door key cylinder unlocked |
11 to 14 V |
|||
M6-27 (FRCY) - Body ground |
LG - Body ground |
Front door courtesy light switch RH input |
Front door RH open |
Below 1 V |
M6-27 (FRCY) - Body ground |
LG - Body ground |
Front door courtesy light switch RH input |
Front door RH open |
11 to 14 V |
M6-6 (FLCY) - Body ground |
Y - Body ground |
Front door courtesy light switch LH input |
Front door LH open |
Below 1 V |
M6-6 (FLCY) - Body ground |
Y - Body ground |
Front door courtesy light switch LH input |
Front door LH closed |
11 to 14 V |
1H-36 (LCTY) - Body ground |
P - Body ground |
Rear door courtesy light switch LH input*1 Upper access panel lock assembly LH input*2 Lower access panel lock assembly LH input*2 |
Rear door LH open |
Below 1 V |
1H-36 (LCTY) - Body ground |
P - Body ground |
Rear door courtesy light switch LH input*1 Upper access panel lock assembly LH input*2 Lower access panel lock assembly LH input*2 |
Rear door LH closed |
Pulse generation |
1D-30 (RCTY) - Body ground |
V - Body ground |
Rear door courtesy light switch RH input*1 Upper access panel lock assembly RH input*2 Lower access panel lock assembly RH input*2 |
Rear door RH open |
Below 1 V |
1D-30 (RCTY) - Body ground |
V - Body ground |
Rear door courtesy light switch RH input*1 Upper access panel lock assembly RH input*2 Lower access panel lock assembly RH input*2 |
Rear door RH closed |
Pulse generation |
1D-11 (LSFL) - Body ground |
P - Body ground |
Front door LH unlock detection switch input |
Front door LH unlocked |
Below 1 V |
1D-11 (LSFL) - Body ground |
P - Body ground |
Front door LH unlock detection switch input |
Ignition switch off, all doors closed and front door LH locked |
Pulse generation |
1D-24 (LSFR) - Body ground |
GR - Body ground |
Front door RH unlock detection switch input |
Front door RH unlocked |
Below 1 V |
1D-24 (LSFR) - Body ground |
GR - Body ground |
Front door RH unlock detection switch input |
Ignition switch off, all doors closed and front door RH locked |
Pulse generation |
1A-41 (LSR) - Body ground |
Y - Body ground |
Rear door RH unlock detection switch input |
Rear door RH or LH unlocked |
Below 1 V |
1A-41 (LSR) - Body ground |
Y - Body ground |
Rear door RH unlock detection switch input |
Ignition switch off, all doors closed and rear door RH and LH locked |
Pulse generation |
1H-27 (LSR) - Body ground |
L - Body ground |
Rear door LH unlock detection switch input |
Rear door LH or RH unlocked |
Below 1 V |
1H-27 (LSR) - Body ground |
L - Body ground |
Rear door LH unlock detection switch input |
Ignition switch off, all doors closed and rear door LH and RH locked |
Pulse generation |
1F-29 (BZR) - Body ground |
Y - Body ground |
Wireless door lock buzzer signal |
Wireless door lock buzzer off |
Below 1 V |
1F-29 (BZR) - Body ground |
Y - Body ground |
Wireless door lock buzzer signal |
Wireless door lock buzzer on |
Pulse generation |
31-1D (KSW) - Body ground |
G - Body ground |
Key unlock warning switch input |
Key in ignition key cylinder |
Below 1 V |
No key in ignition key cylinder |
11 to 14 V or Pulse generation |
If the result is not as specified, there may be a malfunction in the wire harness.
2. CHECK DOOR CONTROL RECEIVER (w/ Tire Pressure Warning System)
(a) Disconnect the T25 door control receiver connector.
(b) 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 connectors disconnected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T25-7 (+B) - Body ground |
BE - Body ground |
Battery (power supply) |
Always |
11 to 14 V |
T25-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the T25 door control receiver connector.
(d) Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T25-5 (PRG) - T25-12 (GND) |
GR - W-B |
Signal input from main body ECU (multiplex network body ECU) |
Key inserted in ignition key cylinder → Key pulled out of ignition key cylinder |
11 to 14 V → Pulse generation → 11 to 14 V |
T25-4 (RDA) - T25-12 (GND) |
B - W-B |
Signal output to main body ECU (multiplex network body ECU) |
Ignition switch off, all doors closed and door control transmitter module set sub-assembly switch not pressed |
11 to 14 V |
Ignition switch off, all doors closed and door control transmitter module set sub-assembly switch pressed |
Pulse generation |
3. CHECK DOOR CONTROL RECEIVER (w/o Tire Pressure Warning System)
(a) Disconnect the D7 door control receiver connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connectors disconnected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
D7-5 (+B) - Body ground |
V - Body ground |
Battery (power supply) |
Always |
11 to 14 V |
D7-1 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(c) Reconnect the D7 door control receiver connector.
(d) Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
D7-3 (PRG) - D7-1 (GND) |
GR - W-B |
Signal input from main body ECU (multiplex network body ECU) |
Key inserted in ignition key cylinder → Key pulled out of ignition key cylinder |
11 to 14 V → Pulse generation → 11 to 14 V |
D7-2 (RDA) - D7-1 (GND) |
B - W-B |
Signal output to main body ECU (multiplex network body ECU) |
Ignition switch off, all doors closed and door control transmitter module set sub-assembly switch not pressed |
11 to 14 V |
Ignition switch off, all doors closed and door control transmitter module set sub-assembly switch pressed |
Pulse generation |
Lost Communication with Power Source Control (B278C)
DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
B278C
An internal malfunction occurs in the certification ECU (smart key ECU
assembly)
Certification ECU (smart key ECU assembly)
CAUTI ...
Rear seats (Access Cab and Double Cab models)
Access Cab models
The bottom cushion of the rear seats can be raised and lowered.
■ Before raising the bottom cushion
Stow the seat belt buckles.
This prevents the seat belt buckles from falling out when you fold the seatback.
■ Raising the bottom cushion
Raise the bottom cushi ...
Occupant Classification System Malfunction (B1650/32)
DESCRIPTION
The occupant classification system circuit consists of the airbag sensor assembly
and the occupant classification system.
When the airbag sensor assembly receives signals from the occupant detection
ECU, it determines whether or not the instrument panel passenger without door airba ...