| Last Modified: 11-29-2007 | 1.6 U | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002WKN005X |
| Title: LIGHTING (INT): LIGHTING SYSTEM: TERMINALS OF ECU (2008 Sequoia) | ||
TERMINALS OF ECU
1. CHECK MAIN BODY ECU
(a) Disconnect the DC, DD, H2 H3, and H4 main body ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
DC-2 (LCTY) - Body ground |
B - Body ground |
Rear door courtesy light switch LH signal |
Rear door LH open → closed |
Below 1 Ω → 10 kΩ or higher |
|
DD-62 (GND1, GND2) - Body ground |
W-B - Body ground |
Body ground |
Always |
Below 1 Ω |
|
H3-21 (PCTY) - Body ground |
O - Body ground |
Front door courtesy light switch RH signal |
Front door RH open → closed |
Below 1 Ω → 10 kΩ or higher |
|
H3-25 (RRCY) - Body ground |
L - Body ground |
Rear door courtesy light switch RH signal |
Rear door RH open → closed |
Below 1 Ω → 10 kΩ or higher |
|
H4-24 (DCTY) - Body ground |
BR - Body ground |
Front door courtesy light switch LH signal |
Front door LH open → closed |
Below 1 Ω → 10 kΩ or higher |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the DC, DD, H2, H3 and H4 main body ECU connectors.
(d) Measure the voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
DB-13 (BECU) - Body ground |
GR - Body ground |
BECU power supply |
Always |
11 to 14 V |
|
DD-43 - Body ground |
LG - Body ground |
IG signal |
Ignition switch off → ON |
Below 1 V → 11 to 14 V |
|
DD-45 - Body ground |
O - Body ground |
ACC signal |
Ignition switch off → ACC |
Below 1 V → 11 to 14 V |
|
DD-51 (ILE) - Body ground |
GR - Body ground |
Illuminated entry system operate signal |
Illuminated entry system off → on |
11 to 14 V → Below 1 V |
|
H2-5 (CANH) - DD-62 (GND1, GND2) |
L - W-B |
CAN communication signal |
Ignition switch ON |
Pulse generation (See waveform 1) |
|
H2-6 (CANL)- DD-62 (GND1, GND2) |
W - W-B |
CAN communication signal |
Ignition switch ON |
Pulse generation (See waveform 2) |
|
H2-10 (LIN2) - DD-62 (GND1, GND2) |
V - W-B |
LIN communication signal |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the main body ECU may have a malfunction.
|
(e) Waveform 1 (Reference) : Using an oscilloscope
HINT:
The waveform varies depending on the CAN communication signal. |
|
(f) Waveform 2 (Reference) : Using an oscilloscope
HINT:
The waveform varies depending on the CAN communication signal. |
2. CHECK BACK DOOR ECU
(a) Disconnect the V2 and V3 back door ECU connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
V2-7 (BECU) - Body ground |
GR - Body ground |
Battery power supply |
Always |
11 to 14 V |
|
V2-8 (SIG) - Body ground |
Y - Body ground |
IG power supply |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
V2-6 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
V3-10 (BDCY) - V3-20 (CTYE) |
P - R |
Back door courtesy light switch signal |
Back door open |
Below 1 Ω |
|
Back door closed |
10 kΩ or higher |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the V2 and V3 back door ECU connectors.
(d) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
V2-2 (LGLP) - V2-6 (GND) |
LG - W-B |
Illumination signal (to luggage compartment room light assembly) |
Back door closed |
11 to 14 V |
|
Back door open |
Below 1 V |
|||
|
V2-16 (MPX1) - V2-6 (GND) |
Y - W-B |
LIN communication signal |
Ignition switch ON |
Pulse generation |
|
V3-20 (CTYE) - V2-6 (GND) |
R - W-B |
Ground for back door courtesy light switch |
Always |
Below 1 Ω |
If the result is not as specified, the back door ECU may be malfunctioning.
|
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