Page 4433 of 4500
Fig. 18: Multiplex Network Body ECU (Driver Door ECU) Table
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: "ON" (door is open) appears on the screen.
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
2.INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY
a. Remove the courtesy lamp switch.
b. Measure the resistance of the switch.
Standard:
SPECIFIED CONDITION
Tester ConnectionSwitch ConditionSpecified Condition
1 - Body groundNot pushed (ON)Below 1 ohms
1 - Body groundPushed (OFF)10 kohms or higher
Page 4434 of 4500
Fig. 19: Identifying Terminals Of Front Door Courtesy Lamp Switch Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY
OK: GO TO NEXT STEP
3.CHECK WIRE HARNESS (FRONT DOOR COURTESY LAMP SWITCH ASSY LH -
MULTIPLEX NETWORK BODY ECU (DRIVER DOOR ECU))
a. Disconnect the D13 switch and D25 ECU connectors.
b. Measure the resistance of the wire harness side connectors.
Standard:
SPECIFIED CONDITION
Tester connectionSpecified condition
D13-1 - D25-23 (CTY)Below 1 ohms
Page 4435 of 4500
Fig. 20: Identifying Terminals Of Front Door Courtesy Lamp Switch Assy LH- Multiplex Network
Body ECU
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
Page 4436 of 4500

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
1.CHECK KEY REMINDER WARNING SYSTEM
a. Check that the key reminder warning buzzer sounds.
1. Close the driver side door, insert the key into the ignition key cylinder and then turn the key
to the LOCK or ACC position.
2. Open the driver side door and check that the buzzer sounds intermittently.
b. Check that the key reminder warning buzzer stops.
1. Check that the buzzer stops sounding if any of the following operations is performed while
the buzzer is sounding:
Close the driver side door (front door courtesy lamp switch is off).
Turn the ignition switch ON.
Pull out the key from the ignition key cylinder.
1.INSPECT UNLOCK WARNING SWITCH ASSY
a. Remove the unlock warning switch.
b. Measure the resistance of the switch.
Standard:
SPECIFIED CONDITION
If the result is not as specified, replace the switch ass
y.
Tester ConnectionSwitch ConditionSpecified Condition
1 -2Not pushed10 kohms or higher
1 -2PushedBelow 1 ohms
Page 4437 of 4500
Fig. 21: Identifying Terminals Of Unlock Warning Switch Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE)
a. Remove the courtesy lamp switch.
b. Measure the resistance of the switch.
Standard:
Page 4438 of 4500
Fig. 22: Identifying Terminals Of Front Door Courtesy Lamp Switch (Driver Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
SPECIFIED CONDITION
If the result is not as specified, replace the switch ass
y.
Tester ConnectionSwitch ConditionSpecified Condition
1 - Body groundNot pushed (ON)Below 1 ohms
1 - Body groundPushed (OFF)10 kohms or higher
Page 4439 of 4500
SYSTEM NAME CHART
System NameSee Procedure
Front Power Seat Control SystemINITIALIZATION
Page 4440 of 4500
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56[
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.