Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

Fig 1: Identifying Main Body ECU (Driver Side Junction Block) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the J3, J4, DB, DC and DD ECU connectors.

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

MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
J4-9 (LSWD) - Body ground	P - Body ground	Front door unlock detection switch LH input	Front door LH UNLOCK	Below 1 V
J4-9 (LSWD) - Body ground	P - Body ground	Front door unlock detection switch LH input	Front door LH LOCK	11 to 14 V (or pulse generation [see step 1, waveform 1 or step 2, waveform 2])
J3-27 (LSWP) - Body ground	V - Body ground	Front door unlock detection switch RH input	Front door RH UNLOCK	Below 1 V
J3-27 (LSWP) - Body ground	V - Body ground	Front door unlock detection switch RH input	Front door RH LOCK	11 to 14 V (or pulse generation [see step 3, waveform 3 or step 4, waveform 4])
DC-1 (LSWL) - Body ground	GR - Body ground	Rear door unlock detection switch LH input	Rear door LH UNLOCK	Below 1 V
DC-1 (LSWL) - Body ground	GR - Body ground	Rear door unlock detection switch LH input	Rear door LH LOCK	11 to 14 V (or pulse generation [see step 5, waveform 5 or step 6, waveform 6])
J3-5 (LSWR) - Body ground	Y - Body ground	Rear door unlock detection switch RH input	Rear door RH UNLOCK	Below 1 V
J3-5 (LSWR) - Body ground	Y - Body ground	Rear door unlock detection switch RH input	Rear door RH LOCK	11 to 14 V (or pulse generation [see step 7, waveform 7 or step 8, waveform 8])
DD-3 (ACT+) - Body ground	W - Body ground	Door lock motor LOCK drive output	Door control switch or front door key cylinder LH OFF	Below 1 V
DD-3 (ACT+) - Body ground	W - Body ground	Door lock motor LOCK drive output	Door control switch or front door key cylinder LH LOCK	11 to 14 V
J4-5 (ACTD) - Body ground	P - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH UNLOCK	11 to 14 V
J4-5 (ACTD) - Body ground	P - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH OFF	Below 1 V
DD-2 (ACT-) - Body ground	L - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH UNLOCK	11 to 14 V
DD-2 (ACT-) - Body ground	L - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH OFF	Below 1 V
DC-24 (ACT+) - Body ground	W - Body ground	Door lock motor LOCK drive output	Door control switch or front door key cylinder LH OFF	Below 1 V
DC-24 (ACT+) - Body ground	W - Body ground	Door lock motor LOCK drive output	Door control switch or front door key cylinder LH LOCK	11 to 14 V
DC-23 (ACT-) - Body ground	L - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH UNLOCK	11 to 14 V
DC-23 (ACT-) - Body ground	L - Body ground	Door lock motor UNLOCK drive output	Door control switch or front door key cylinder LH OFF	Below 1 V
DD-53 (L2) - Body ground	V - Body ground	Front door key switch LH LOCK input	Front door key cylinder LH LOCK	Below 1 V
DD-53 (L2) - Body ground	V - Body ground	Front door key switch LH LOCK input	Ignition switch OFF, all doors closed and front door key cylinder LH neutral position	11 to 14 V (or pulse generation [see step 9, waveform 9 or step 10, waveform 10])
J4-10 (UL3) - Body ground	B - Body ground	Front door key switch LH UNLOCK input	Front door key cylinder LH UNLOCK	Below 1 V
J4-10 (UL3) - Body ground	B - Body ground	Front door key switch LH UNLOCK input	Ignition switch OFF, all doors closed and front door key cylinder LH neutral position	11 to 14 V (or pulse generation [see step 9, waveform 9 or step 10, waveform 10])
DD-49 (L1) - Body ground	W - Body ground	Door control switch LOCK input	Door control switch OFF	10 kΩ or higher
DD-49 (L1) - Body ground	W - Body ground	Door control switch LOCK input	Door control switch LOCK	Below 1 Ω
DD-52 (UL1) - Body ground	B - Body ground	Front door control switch LH UNLOCK input	Front door control switch LH OFF	10 kΩ or higher
DD-52 (UL1) - Body ground	B - Body ground	Front door control switch LH UNLOCK input	Front door control switch LH UNLOCK	Below 1 Ω
DD-40 (UL1) - Body ground	W - Body ground	Front door control switch RH UNLOCK input	Front door control switch RH OFF	10 kΩ or higher
DD-40 (UL1) - Body ground	W - Body ground	Front door control switch RH UNLOCK input	Front door control switch RH UNLOCK	Below 1 Ω
DD-62 (GND1, GND2) - Body ground	W-B - Body ground	Power ground	Always	Below 1 Ω
DB-13 (BECU) - Body ground	GR - Body ground	+B power source (signal system)	Always	11 to 14 V

If the result is not as specified, the ECU may have a malfunction.

Using an oscilloscope, check the waveform 1.

Waveform 1 (Reference)

WAVEFORM 1 REFERENCE

Item	Content
Terminal No. (Symbols)	J4-9 (LSWD) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Front door LH LOCK

Fig 2: Identifying Waveform Graph 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 2.

WAVEFORM 2 REFERENCE

Item	Content
Terminal No. (Symbols)	J4-9 (LSWD) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Front door RH LOCK

Fig 3: Identifying Waveform Graph 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 3.

Waveform 3 (Reference)

WAVEFORM 3 REFERENCE

Item	Content
Terminal No. (Symbols)	J3-27 (LSWP) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Front door RH LOCK

Fig 4: Identifying Waveform Graph 3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 4.

Waveform 4 (Reference)

WAVEFORM 4 REFERENCE

Item	Content
Terminal No. (Symbols)	J3-27 (LSWP) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Front door RH LOCK

Fig 5: Identifying Waveform Graph 4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 5.

Waveform 5 (Reference)

WAVEFORM 5 REFERENCE

Item	Content
Terminal No. (Symbols)	DC-1 (LSWL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Rear door LH LOCK

Fig 6: Identifying Waveform Graph 5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 6.

Waveform 6 (Reference)

WAVEFORM 6 REFERENCE

Item	Content
Terminal No. (Symbols)	DC-1 (LSWL) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Rear door LH LOCK

Fig 7: Identifying Waveform Graph 6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an oscilloscope, check the waveform 7.

Waveform 7 (Reference)

WAVEFORM 7 REFERENCE

Item	Content
Terminal No. (Symbols)	J3-5 (LSWR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Rear door RH LOCK

Fig 8: Identifying Waveform Graph 7

Using an oscilloscope, check the waveform 8.

Waveform 8 (Reference)

WAVEFORM 8 REFERENCE

Item	Content
Terminal No. (Symbols)	J3-5 (LSWR) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Rear door RH LOCK

Fig 9: Identifying Waveform Graph 8

Using an oscilloscope, check the waveform 9.

Waveform 9 (Reference)

WAVEFORM 9 REFERENCE

Item	Content
Terminal No. (Symbols)	DD-53 (L2) - Body ground J4-14 (UL3) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch OFF, all doors closed and front door lock key cylinder LH neutral position

Fig 10: Identifying Waveform Graph 9

Using an oscilloscope, check the waveform 10.

Waveform 10 (Reference)

WAVEFORM 10 REFERENCE

Item	Content
Terminal No. (Symbols)	DD-53 (L2) - Body ground J4-14 (UL3) - Body ground
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch OFF, all doors closed and front door lock key cylinder LH neutral position

Fig 11: Identifying Waveform Graph 10