Last Modified: 11-29-2007 1.6 U
Service Category: Vehicle Exterior Section: Lighting (ext)
Model Year: 2008 Model: Sequoia Doc ID: RM000002WKN006X
Title: LIGHTING (EXT): LIGHTING SYSTEM: TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK MAIN BODY ECU



(a) Disconnect the 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

DD-62 (GND1, GND2) - Body ground

W-B - Body ground

Body ground

Always

Below 1 Ω

H2-4 (HAZ) - Body ground

O - Body ground

Hazard warning signal switch input signal

Hazard warning signal switch OFF → ON

10 kΩ or higher → Below 1 Ω

H3-28 (FFOG) - Body ground

P - Body ground

Front fog light switch signal

Front fog light switch OFF → ON

10 kΩ or higher → Below 1 Ω

H3-17 (HEAD) - Body ground

W - Body ground

Light control switch HEAD signal

Light control switch HEAD

Below 1 Ω

Light control switch except HEAD

10 kΩ or higher

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

H4-21 (A) - Body ground

G - Body ground

Light control switch AUTO signal

Light control switch AUTO

Below 1 Ω

Light control switch except AUTO

10 kΩ or higher

H4-23 (TAIL) - Body ground

O - Body ground

Light control switch TAIL signal

Light control switch TAIL

Below 1 Ω

Light control switch except TAIL

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 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

DB-16 (DIM) - Body ground

R - Body ground

Headlight low beam signal

Light control switch HEAD,

dimmer switch High

Below 1 V

Light control switch HEAD,

dimmer switch except High

11 to 14 V

DB-18 (HRLY) - Body ground

L - Body ground

Headlight low beam signal

Light control switch HEAD,

dimmer switch Low

Below 1 V

Light control switch HEAD,

dimmer switch except Low

11 to 14 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)

H4-4 (FFGO) - Body ground

SB - Body ground

Front fog light signal

Light control switch TAIL,

front fog light switch ON

Below 1 V

Light control switch TAIL,

front fog light switch OFF

11 to 14 V

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

(e) Waveform 1 (Reference) : Using an oscilloscope

CAN Communication Signal

Terminal Name

CANH - GND1, GND2

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(f) Waveform 2 (Reference) : Using an oscilloscope

CAN Communication Signal

Terminal Name

CANL - GND1, GND2

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

2. CHECK OUTER MIRROR CONTROL ECU



(a) Disconnect the M7 and M8 outer mirror control 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

M7-3 (B) - Body ground

R - Body ground

Battery power supply

Always

11 to 14 V

M7-4 (ACC) - Body ground

Y - Body ground

ACC power supply

Ignition switch

off → ACC

Below 1 V → 11 to 14 V

M7-9 (GND) - Body ground

W-B - Body ground

Body ground

Always

Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the M7 and M8 outer mirror control 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

M8-1 (CAN) - M7-9 (GND)

LG - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(see waveform 1)

M8-17 (LP) - Body ground

V - Body ground

Puddle light LH operation signal

Puddle light LH turn on

11 to 14 V

M8-21 (CGND) - M7-9 (GND)

W - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(see waveform 2)

M8-37 (LP) - Body ground

SB - Body ground

Puddle light RH operation signal

Puddle light RH turn on

11 to 14 V

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

(e) Waveform 1 (Reference) : Using an oscilloscope

CAN Communication Signal

Terminal Name

CAN - GND

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(f) Waveform 2 (Reference) : Using an oscilloscope

CAN Communication Signal

Terminal Name

CGND - GND

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.