POWER DOOR LOCK CONTROL SYSTEM - Door Control Switch Circuit

DESCRIPTION

When the lock side of the door control switch is pressed, continuity is established between terminals 3 and 2 of the switch. When the unlock side of the switch is pressed, continuity is established between terminals 1 and 2.

Terminals L1 and UL1 of the main body ECU RH are connected to the door control switch and door lock/unlock request signals (by door control switch operation) are input to the ECU.

The main body ECU RH constantly applies voltage to terminal 3 of the door control switch via terminal L1. When the door control switch is operated to lock all doors, current flows from terminal L1 to terminal 3. The main body ECU RH determines that this is door lock request signal input.

The main body ECU RH also applies constant voltage to terminal 1 of the door control switch via terminal UL1. When the door control switch is operated to unlock the doors, current flows from terminal UL1 to terminal 1. The main body ECU RH determines that this is door unlock request signal input.

WIRING DIAGRAM

Power Door Lock Control System - Door Control Switch Circuit. DOOR LOCK. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.READ VALUE OF DATA LIST (FRONT PASSENGER SIDE DOOR CONTROL SWITCH ASSEMBLY)

Check the DATA LIST to ensure proper function of the front passenger door lock switch.

BODY (Main Body ECU):
Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
Door Lock SW-Lock	Front passenger side door control switch lock signal /ON or OFF	ON: Door control switch is pushed to LOCK position OFF: Door control switch is not pushed to LOCK position	-
Door Lock SW-Unlock	Front passenger side door control switch unlock signal /ON or OFF	ON: Door control switch is pushed to UNLOCK position OFF: Door control switch is not pushed to UNLOCK position	-

OK:
The display is as specified in the normal condition column.

Go to step 2

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.INSPECT DOOR CONTROL SWITCH ASSEMBLY

Power Door Lock Control System - Door Control Switch Circuit. DOOR LOCK. Lexus IS250 IS220d GSE20 ALE20

Remove the door control switch assembly.

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

Standard resistance:
Tester Connection Condition Specified Condition
2 - 3 Lock Below 1 Ω
2 - 3
1 - 2 OFF (Free) 10 kΩ or higher
1 - 2 Unlock Below 1 Ω

REPLACE DOOR CONTROL SWITCH ASSEMBLY

OK

3.CHECK WIRE HARNESS (DOOR CONTROL SWITCH ASSEMBLY - MAIN BODY ECU RH)

Disconnect the door control switch assembly connector.

Disconnect the ECU (cowl side J/B RH) connector.

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

Standard resistance:

Tester Connection (Symbols)	Condition	Specified Condition
L9-3 - RJ-7 (*1)	Always	Below 1 Ω
L9-1 - RJ-10 (*1)	Always	Below 1 Ω
L9-2 - Body ground (*1)	Always	Below 1 Ω
M17-3 - RJ-7 (*1)	Always	Below 1 Ω
M17-1 - RJ-10 (*2)	Always	Below 1 Ω
M17-2 - Body ground (*2)	Always	Below 1 Ω
RJ-7 - Body ground	Always	10 kΩ or higher
RJ-10 - Body ground	Always	10 kΩ or higher

*1: LHD Models

*2: RHD Models

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)

Tester Connection	Condition	Specified Condition
2 - 3	Lock	Below 1 Ω
2 - 3 1 - 2	OFF (Free)	10 kΩ or higher
1 - 2	Unlock	Below 1 Ω