Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001CTR004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1783/83; Door Courtesy Switch Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

C1783/83

Door Courtesy Switch Circuit

DESCRIPTION

The door courtesy switch comes on when the door is opened and goes off when the door is closed.

Therefore, battery positive voltage is applied to the terminal DOOR of the ECU when all the doors are closed and 0 V is applied when even one door is opened.

DTC No.

DTC Detection Condition

Trouble Area

C1783/83

Door courtesy switch signal does not change
  • Door courtesy switch
  • Instrument ECU
  • 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.

CHECK OPERATION OF OPEN DOOR WARNING LIGHT

(a) Check that open door warning light comes on when each door is opened and goes off when all doors are closed 2007 MY LX470 [08/2006 -        ]; METER: METER / GAUGE SYSTEM: Warning Light Circuit .

NG

CHECK OR REPAIR OPEN DOOR WARNING LIGHT CIRCUIT

OK

2.

READ VALUE USING INTELLIGENT TESTER (DOOR COURTESY 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.

(c) Select the DATA LIST mode on the intelligent tester.

(d) Check the door courtesy switch condition displayed on the intelligent tester when all doors are closed and each door is opened.

OK:

When each door is opened: ON is displayed for door courtesy switch condition.

When all doors are closed: OFF is displayed for door courtesy switch condition.

NG

GO TO STEP 4

OK

REPLACE SUSPENSION CONTROL ECU

3.

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 DOOR of the suspension control ECU connector and body ground when all doors are closed and each door is opened.

Standard voltage:

Tester Connection

Condition

Specified Condition

S6-15 (DOOR) - Body ground

All doors closed

9 to 14 V

S6-15 (DOOR) - Body ground

Each door opened

Below 1.5 V
NG

REPLACE SUSPENSION CONTROL ECU

OK

4.

CHECK WIRE HARNESS (INSTRUMENT ECU - SUSPENSION CONTROL ECU)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE SUSPENSION CONTROL ECU