POWER DOOR LOCK CONTROL SYSTEM - Front Passenger Side Door UNLOCK Detection Switch Circuit

DESCRIPTION

The front passenger door unlock detection switch is built into the front passenger door lock assembly. The switch turns on when the front passenger door is locked and turns off when the door is unlocked.

The main body ECU RH is connected to the front passenger door lock assembly via terminal LSWP and front passenger door lock/unlock state signals are input to the ECU.

The main body ECU RH applies voltage to the door unlock detection switch via terminal LSWP. When the door unlock detection switch is on (there is continuity between the switch terminals), a lock state signal is input to the ECU. When the switch is off (there is no continuity between the switch terminals), an unlock state signal is input.

WIRING DIAGRAM

Power Door Lock Control System - Front Passenger Side Door Unlock Detection Switch Circuit. DOOR LOCK. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.READ VALUE OF DATA LIST (DOOR UNLOCK DETECTION SWITCH)

Check the DATA LIST to ensure proper function of the door unlock detection switch.

BODY (Main Body ECU):
Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
Passenger Lock Position SW	Passenger side door lock position switch signal /ON or OFF	ON: Passenger side door lock is in UNLOCK position OFF: Passenger side door lock is in LOCK 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 FRONT DOOR LOCK ASSEMBLY (DOOR UNLOCK DETECTION SWITCH)

Power Door Lock Control System - Front Passenger Side Door Unlock Detection Switch Circuit. DOOR LOCK. Lexus IS250 IS220d GSE20 ALE20

LHD Models:

Remove the front door lock assembly RH.

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

Standard resistance:

Tester Connection	Measurement Condition	Door Lock Condition	(Specified Condition)
7 - 8	Battery positive (+) → Terminal 1 Battery negative (-) → Terminal 2	LOCK	10 kΩ or higher
7 - 8	Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1	UNLOCK	Below 1 Ω

RHD Models:

Power Door Lock Control System - Front Passenger Side Door Unlock Detection Switch Circuit. DOOR LOCK. Lexus IS250 IS220d GSE20 ALE20

Remove the front door lock assembly LH.

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

Standard resistance:

Tester Connection	Measurement Condition	Door Lock Condition	(Specified Condition)
7 - 8 (*1)	Battery positive (+) → Terminal 4 Battery negative (-) → Terminal 3	LOCK	10 kΩ or higher
7 - 8 (*1)	Battery positive (+) → Terminal 3 Battery negative (-) → Terminal 4	UNLOCK	Below 1 Ω
7 - 8 (*2)	Battery positive (+) → Terminal 4 Battery negative (-) → Terminal 1	LOCK	10 kΩ or higher
7 - 8 (*2)	Battery positive (+) → Terminal 1 Battery negative (-) → Terminal 4	UNLOCK	Below 1 Ω

*1: w/ Double locking system

*2: w/o Double locking system

REPLACE FRONT DOOR LOCK ASSEMBLY

OK

3.CHECK WIRE HARNESS (FRONT DOOR LOCK ASSEMBLY - MAIN BODY ECU RH)

Disconnect the front door lock assembly connector.

Disconnect the ECU connector.

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

Standard resistance:

Tester Connection (Symbols)	Condition	Specified Condition
L8-7 (LSSR) - J75-27 (LSWP) (*1)	Always	Below 1 Ω
L8-8 (E) - Body ground (*1)	Always	Below 1 Ω
M2-8 (LSSR) - J75-27 (LSWP) (*2)	Always	Below 1 Ω
M2-7 (E) - Body ground (*2)	Always	Below 1 Ω

*1: LHD Models

*2: RHD Models

REPAIR OR REPLACE HARNESS OR CONNECTOR

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