Lexus IS250 · Service Manual BODY ELECTRICAL

Front Passenger Side Door UNLOCK Detection Switch Circuit

Circuit diagnosis

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

B109773E32

INSPECTION PROCEDURE


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

  1. 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.



 NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT FRONT DOOR LOCK ASSEMBLY (DOOR UNLOCK DETECTION SWITCH)

  1. B064708E02
    LHD Models:

    1. Remove the front door lock assembly RH.

    2. 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

  1. RHD Models:B112740E02

    1. Remove the front door lock assembly LH.

    2. 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



 NG
REPLACE FRONT DOOR LOCK ASSEMBLY
OK


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

  1. B111708E10
    Disconnect the front door lock assembly connector.

  1. Disconnect the ECU connector.

  1. 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



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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


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