SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1788/88; Height Control OFF Switch Circuit; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM000001CTS004X
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1788/88; Height Control OFF Switch Circuit; 2007 MY LX470 [08/2006 - ]

DTC

C1788/88

Height Control OFF Switch Circuit

DESCRIPTION

This is the height control system main switch. When the height control switch is pushed, the height control OFF indicator light lights up and height control goes off.

The OFF condition of the height control will not be cancelled until the height control switch is pushed again or the vehicle is driven.

DTC No.	DTC Detection Condition	Trouble Area
C1788/88	Height control switch signal does not input	Suspension control switch (Height control switch) Suspension control ECU Wire harness

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

PROCEDURE

1.	READ VALUE USING INTELLIGENT TESTER (HEIGHT CONTROL SWITCH)*1

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch ON and push the intelligent tester main switch ON.

(d) Check the height control switch condition displayed on the intelligent tester when pushing the height control switch.

OK:

When height control switch is pushed: ON is displayed for height control switch condition.

GO TO STEP 3

REPLACE SUSPENSION CONTROL ECU

2.	CHECK SUSPENSION CONTROL ECU*2

(a) Remove the suspension control ECU with connectors still connected.

(b) Turn the ignition switch ON.

(c) Measure the voltage between terminal NSW of the suspension control ECU connector and body ground when the height control switch is pushed and released.

Standard voltage:

Tester Connection	Condition	Specified Condition
S7-6 (NSW) - Body ground	Pushed	9 to 14 V
S7-6 (NSW) - Body ground	Released	Below 1.5 V

REPLACE SUSPENSION CONTROL ECU

3.	INSPECT SUSPENSION CONTROL SWITCH (HEIGHT CONTROL SWITCH)

(a) Remove the suspension control switch.

(b) Disconnect the suspension control switch (for height control switch) connector.

(c) Measure the resistance between terminals 9 and 4 of the suspension control switch (for height control switch) connector when the height control switch is pushed and released.

Standard resistance:

Tester Connection	Condition	Specified Condition
9 - 4	Pushed	Below 1 Ω
9 - 4	Released	10 kΩ or higher

REPLACE SUSPENSION CONTROL SWITCH (HEIGHT CONTROL SWITCH)

4.	CHECK WIRE HARNESS (SUSPENSION CONTROL SWITCH (HEIGHT CONTROL SWITCH) - SUSPENSION CONTROL ECU)

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE SUSPENSION CONTROL ECU