Last Modified: 11-29-2007 1.6 U
Service Category: Drivetrain Section: Transfer/4wd/Awd
Model Year: 2008 Model: Sequoia Doc ID: RM0000030AB002X
Title: JF3A TRANSFER / 4WD / AWD: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK 4WD CONTROL ECU



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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A28-1 (HL1) - A29-4 (GND)

O - W-B

High-low transfer shift actuator limit switch

Ignition switch ON

4WD control switch 4H

Below 1.5 V

Ignition switch ON

4WD control switch 4L

10.5 to 14 V

A28-2 (HL2) - A29-4 (GND)

R - W-B

High-low transfer shift actuator limit switch

Ignition switch ON

4WD control switch 4H

10.5 to 14 V

Ignition switch ON

4WD control switch 4L

Below 1.5 V

A28-3 (HL3) - A29-4 (GND)

GR - W-B

High-low transfer shift actuator limit switch

Ignition switch ON

4WD control switch 4H

10.5 to 14 V

Ignition switch ON

1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation

Below 1.5 V

Ignition switch ON

Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation

10.5 to 14 V

A28-5 (TT) - A28-25 (TGND)

L - P

Temperature sensor

Ignition switch ON

0 to 5 V

A28-6 (TL1) - A29-4 (GND)

V - W-B

Multi mode transfer shift actuator limit switch

Ignition switch ON

4WD control switch 2WD

Below 1.5 V

Ignition switch ON

4WD control switch 4H or 4L

10.5 to 14 V

A28-7 (TL2) - A29-4 (GND)

BR - W-B

Multi mode transfer shift actuator limit switch

Ignition switch ON

4WD control switch 2WD

10.5 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Lock

10.5 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Free

Below 1.5 V

A28-8 (TL3) - A29-4 (GND)

W - W-B

Multi mode transfer shift actuator limit switch

Ignition switch ON

4WD control switch 2WD

10.5 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Lock

Below 1.5 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Free

10.5 to 14 V

A28-9 (DL1) - A29-4 (GND)

LG - W-B

A.D.D. actuator limit switch

Ignition switch ON

4WD control switch 2WD (A.D.D. actuator Free)

10.5 to 14 V

Ignition switch ON

4WD control switch 4H (A.D.D. actuator Lock)

Below 1.5 V

A28-10 (DL2) - A29-4 (GND)

R - W-B

A.D.D. actuator limit switch

Ignition switch ON

4WD control switch 2WD (A.D.D. actuator Free)

Below 1.5 V

Ignition switch ON

4WD control switch 4H (A.D.D. actuator Lock)

10.5 to 14 V

A28-11 (2-4) - A29-4 (GND)

B - W-B

4WD control switch

Ignition switch ON

4WD control switch 2WD or 4H

Below 1.5 V

Ignition switch ON

4WD control switch 4L

10.5 to 14 V

A28-12 (DL) - A29-4 (GND)

GR - W-B

Center differential lock switch

Ignition switch ON

Center differential lock switch OFF

10.5 to 14 V

Ignition switch ON

Center differential lock switch ON

Below 1.5 V

A28-13 (LO) - A29-4 (GND)

P - W-B

4WD control switch

Ignition switch ON

4WD control switch 2WD

10.5 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Below 1.5 V

A28-14 (4WD) - A29-4 (GND)

G - W-B

Multi mode transfer shift actuator

center differential lock position detection switch

Ignition switch ON

4WD control switch 2WD

9.5 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Lock

Below 1.5 V

Ignition switch ON

4WD control switch 4H or 4L

Center differential Free

9.5 to 14 V

A28-15 (ADD) - A29-4 (GND)

Y - W-B

A.D.D. actuator A.D.D. detection switch

Ignition switch ON

4WD control switch 2WD

10 to 14 V

Ignition switch ON

4WD control switch 4H or 4L

Below 1.5 V

A28-16 (NP) - A29-4 (GND)

B - W-B

Multi mode transfer shift actuator neutral detection switch

Ignition switch ON

1.5 seconds or less after 4WD HIGH to 4WD LOW switching operation

Below 1.5 V

Ignition switch ON

Over 1.5 seconds after 4WD HIGH to 4WD LOW switching operation

10 to 14 V

A28-19 (CANH) - A28-20 (CANL)

O - W

CAN communication line

Ignition switch off

54 to 69 Ω

A28-21 (L4) - A29-4 (GND)

Y - W-B

Transfer 4LO signal

Except 4WD control switch 4L

10 to 14 V

Ignition switch ON

4WD control switch 4L

Below 1.5 V

A29-1 (DM1) - A29-4 (GND)

W - W-B

A. D. D. actuator motor

Ignition switch ON

4WD control switch 4H (During operation of A.D.D. actuator from Lock to Free)

10 to 14 V

Ignition switch ON

4WD control switch 4H (A.D.D. actuator Free)

Below 1.5 V

A29-2 (HM1) - A29-4 (GND)

GR - W-B

High-low transfer shift actuator motor

Ignition switch ON

4WD control switch 4L → 4H (During operation of high-low transfer shift actuator motor from 4WD LOW to 4WD HIGH)

10 to 14 V

Ignition switch ON

4WD control switch 4L → 4H (High-low transfer shift actuator motor stopped)

Below 1.5 V

A29-3 (IG) - A29-4 (GND)

V - W-B

IG power

Ignition switch ON

11 to 14 V

A29-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A29-5 (DM2) - A29-4 (GND)

Y - W-B

A. D. D. actuator motor

Ignition switch ON

4WD control switch 4H (during operation of A.D.D. actuator from Free to Lock)

10 to 14 V

Ignition switch ON

4WD control switch 4H (A.D.D. actuator Lock)

Below 1.5 V

A29-6 (HM2) - A29-4 (GND)

P - W-B

High-low transfer shift actuator motor

Ignition switch ON

4WD control switch 4H → 4L (During operation of high-low transfer shift actuator motor from 4WD HIGH to 4WD LOW)

10 to 14 V

Ignition switch ON

4WD control switch 4H → 4L (High-low transfer shift actuator motor stopped)

Below 1.5 V

A29-7 (TM2) - A29-4 (GND)

LG - W-B

Multi mode transfer shift actuator motor

Ignition switch ON

4WD control switch 4H or 4L → 2WD (During operation of Multi mode transfer shift actuator motor from 4WD HIGH or 4WD LOW to 2WD)

10 to 14 V

Ignition switch ON

4WD control switch 4H or 4L → 2WD (Multi mode transfer shift actuator motor stopped)

Below 1.5 V

A29-8 (TM1) - A29-4 (GND)

R - W-B

Multi mode transfer shift actuator motor

Ignition switch ON

4WD control switch 2WD → 4H or 4L (During operation of Multi mode transfer shift actuator motor from 2WD to 4WD HIGH or 4WD LOW)

10 to 14 V

Ignition switch ON

4WD control switch 2WD → 4H or 4L (Multi mode transfer shift actuator motor stopped)

Below 1.5 V