Lexus IS250 IS220d GSE20 ALE20 - LIGHTING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

INSPECT DOOR COURTESY SWITCH (FRONT LH)

CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (FRONT LH) - MAIN BODY ECU RH)

INSPECT DOOR COURTESY SWITCH (FRONT RH)

CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (FRONT RH) - MAIN BODY ECU RH)

INSPECT DOOR COURTESY SWITCH (REAR LH AND REAR RH)

CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (REAR LH OR REAR RH) - MAIN BODY ECU RH)

LIGHTING SYSTEM - Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU RH detects the condition of each door courtesy switch and sends a signal to each ECU via the multiplex communication circuit.


WIRING DIAGRAM

Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • HINT:
  • The procedure is the same for each door courtesy switch circuit. First, inspect the suspected door courtesy switch circuit.
1.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the intelligent tester main switch on.

Select the items below in the DATA LIST for proper functioning of the courtesy switch.

DATA LIST: Body (Main Body ECU LH)
ItemMeasurement Item / Display
(Range)		Normal ConditionDiagnostic Note
D Door Courtesy SW Driver side door courtesy switch / ON or OFF ON: Driver side door is open
OFF: Driver side door is closed		-
P Door Courtesy SW Passenger side door courtesy switch / ON or OFF ON: Passenger side door is open
OFF: Passenger side door is closed		-
Rear Door Courtesy SW Rear (LH and RH) door courtesy switch / ON or OFF ON: Rear door (LH or RH) is open
OFF: Rear door (LH and RH) is closed		-
  • OK:
  • Condition sign can be displayed.
  • Result:
  • ResultProceed to
    OKA
    Driver side door courtesy switch does not operateB
    Front passenger side door courtesy switch does not operateC
    Both rear door courtesy switches do not operateD
B
Go to step 2
C
Go to step 4
D
Go to step 6
A
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2.INSPECT DOOR COURTESY SWITCH (FRONT LH)

Inspection


  • OK:
  • Door courtesy switch is normal.
NG
REPLACE DOOR COURTESY SWITCH (FRONT LH)
OK
3.CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (FRONT LH) - MAIN BODY ECU RH)
Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the P1 ECU connector.

Disconnect the Q11 switch connector.

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

  • Standard resistance:
  • LHD:
  • Tester ConnectionConditionSpecified Condition
    P1-14 (DCTY) - Q11-1AlwaysBelow 1 Ω
    P1-14 (DCTY) or Q11-1 - Body groundAlways10 kΩ or higher
  • RHD:
  • Tester ConnectionConditionSpecified Condition
    P1-14 (DCTY) - P8-1AlwaysBelow 1 Ω
    P1-14 (DCTY) or P8-1 - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)
4.INSPECT DOOR COURTESY SWITCH (FRONT RH)

Inspection


  • OK:
  • Door courtesy switch is normal.
NG
REPLACE DOOR COURTESY SWITCH (FRONT RH)
OK
5.CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (FRONT RH) - MAIN BODY ECU RH)
Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J75 ECU connector.

Disconnect the P8 switch connector.

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

  • Standard resistance:
  • RHD:
  • Tester ConnectionConditionSpecified Condition
    J75-23 (PCTY) - P8-1AlwaysBelow 1 Ω
    J75-23 (PCTY) or P8-1 - Body groundAlways10 kΩ or higher
  • LHD:
  • Tester ConnectionConditionSpecified Condition
    J75-23 (PCTY) - Q11-1AlwaysBelow 1 Ω
    J75-23 (PCTY) or Q11-1 - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)
6.INSPECT DOOR COURTESY SWITCH (REAR LH AND REAR RH)

Inspection


  • OK:
  • Door courtesy switch is normal.
NG
REPLACE DOOR COURTESY SWITCH (REAR LH OR REAR RH)
OK
7.CHECK HARNESS AND CONNECTOR (DOOR COURTESY SWITCH (REAR LH OR REAR RH) - MAIN BODY ECU RH)
Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Check the wire harness between the cowl side junction block RH and door courtesy switch (rear LH).


Disconnect the RA junction block connector.

Disconnect the Q17 switch connector.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    RA-11 (LCTY) - Q17-1AlwaysBelow 1 Ω
    RA-11(LCTY) or Q17-1 - Body groundAlways10 kΩ or higher
Lighting System - Door Courtesy Switch Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Check the wire harness between the main body ECU RH and door courtesy switch (rear RH).


Disconnect the P1 ECU connector.

Disconnect the P16 switch connector.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    P1-16 (RCTY) - P16-1AlwaysBelow 1 Ω
    P1-16 (RCTY) or P16-1 - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU RH (COWL SIDE J/B RH)
LEXUS IS250, IS220d / GSE20 ALE20
LIGHTING
Lexus IS250 IS220d GSE20 ALE20
LIGHTING SYSTEM