Last Modified: 11-29-2007 1.6 U
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000001N9000BX
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/o AVS): TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK SUSPENSION CONTROL ECU



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

Standard

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

O19-1 (SLEX) - O19-22 (GND)

V - W-B

Exhaust solenoid valve

Ignition switch ON

Below 1.0 V

Engine idling, button of height control switch is pushed from "UP" to "DOWN"

9 V or more

O19-3 (SLRR) - O19-22 (GND)

B - W-B

Height control valve (Leveling solenoid valve)

Ignition switch ON

Below 1.0 V

Engine idling, button of height control switch is pushed from "DOWN" to "UP"

9 V or more

O19-4 (SLRL) - O19-22 (GND)

O - W-B

Height Control Valve (Gate solenoid valve)

Ignition switch ON

Below 1.0 V

Engine idling, button of height control switch is pushed from "DOWN" to "UP"

9 V or more

O19-5 (RC) - O19-22 (GND)

LG - W-B

Suspension control relay

Ignition switch ON

Below 1.0 V

Engine idling, button of height control switch is pushed from "DOWN" to "UP"

9 V or more

O19-10 (IG) - O19-22 (GND)

GR - W-B

IG power supply

Ignition switch ON

10 to 14 V

O19-12 (TD) - O19-22 (GND)

L - W-B

Height control mode select switch

Ignition switch ON, Height control select switch pushed (ON)

Below 1.5 V

Ignition switch ON, Height control select switch released (OFF)

10 to 14 V

O19-13 (UPSW) - O19-22 (GND)

Y - W-B

Height control switch (UP)

Ignition switch ON, "UP" button of height control switch pushed in

Below 1.5 V

Ignition switch ON, "UP" button of height control switch released

10 to 14 V

O19-14 (SBR2) - O19-22 (GND)

L - W-B

Height control sensor RH power source

Ignition switch ON

4.5 to 5.5 V

O19-15 (SBL2) - O19-22 (GND)

LG - W-B

Height control sensor LH power source

Ignition switch ON

4.5 to 5.5 V

O19-16 (SHRR) - O19-18 (SGR2)

R - BR

Height control sensor RH

Ignition switch ON

0.5 to 4.5 V

Engine idling, vehicle height is changed from "HIGH" to "NORMAL" by pressing the height control switch

2.4 to 2.7 V

O19-17 (SHRL) - O19-19 (SGL2)

Y - V

Height control sensor LH

Ignition switch ON

0.5 to 4.5 V

Engine idling, vehicle height is changed from "HIGH" to "NORMAL" by pressing the height control switch

2.4 to 2.7 V

O19-18 (SGR2) - O19-22 (GND)

BR - W-B

Height control sensor RH ground

Always

Below 1.0 Ω

O19-19 (SGL2) - O19-22 (GND)

V - W-B

Height control sensor LH ground

Always

Below 1.0 Ω

O19-20 (RM+) - O19-22 (GND)

G - W-B

Motor lock (+)

Engine idling, vehicle height changes from "NORMAL" to "HIGH" by pressing the height control switch (While height control compressor assembly is working).

Below 1.0 Ω

O19-21 (RM-) - Body ground

P - Body ground

Motor lock (-)

Always

Below 1.0 Ω

O19-22 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1.0 Ω

O19-24 (B) - O19-22 (GND)

SB - W-B

+B power supply

Always

10 to 14 V

O19-25 (BAT) - O19-22 (GND)

SB - W-B

+B power supply

Always

10 to 14 V

O19-28 (CANL) - O19-22 (GND)

W - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

O19-29 (CANH) - O19-22 (GND)

B - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

O19-32 (DNSW) - O19-22 (GND)

GR - W-B

Height control switch (DOWN)

Ignition switch ON, "DOWN" button of height control switch pushed in

Below 1.5 V

Ignition switch ON, "DOWN" button of height control switch released

10 to 14 V

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


(b) Using an oscilloscope, check the waveform 1.

Reference

Terminal No. (Symbol)

O19-28 (CANL) - O19-22 (GND)

Tool Setting

1 V/DIV, 10 μs/DIV

Vehicle Condition

Ignition switch ON, Engine stopped


(c) Using an oscilloscope, check the waveform 2.

Reference

Terminal No. (Symbol)

O19-29 (CANH) - O19-22 (GND)

Tool Setting

1 V/DIV, 10 μs/DIV

Vehicle Condition

Ignition switch ON, Engine stopped