Toyota Venza: Door Courtesy Switch Circuit

Toyota Venza Service Manual / Lighting (int) / Lighting System / Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) detects the condition of the door courtesy light switch.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the display on the Techstream.

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
D door Courtesy SW	Driver side door courtesy light switch signal/ON or OFF	ON: Driver side door open OFF: Driver side door closed	-
P door Courtesy SW	Front passenger side door courtesy light switch signal/ON or OFF	ON: Front passenger side door open OFF: Front passenger side door closed	-
RR door Courtesy SW	Rear door courtesy light switch RH signal/ON or OFF	ON: Rear door RH open OFF: Rear door RH closed	-
RL door Courtesy SW	Rear door courtesy light switch LH signal/ON or OFF	ON: Rear door LH open OFF: Rear door LH closed	-
Back door Courtesy SW	Back door Courtesy switch signal/ON or OFF	ON: Back door open OFF: Back door closed	-

OK:

Normal conditions listed above are displayed.

Result	Proceed to
OK	A
Driver side or front passenger side courtesy light switch does not operate	B
Rear door courtesy light switch LH or RH does not operate	C
Back door courtesy switch does not operate	D

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 4

GO TO STEP 6

2.	INSPECT COURTESY LIGHT SWITCH (DRIVER SIDE OR FRONT PASSENGER SIDE)

(a) Remove the courtesy light switch (See page ).

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 - Switch body	Pushed	10 kΩ or higher
1 - Switch body	Not pushed	Below 1 Ω

Text in Illustration

Component without harness connected

(Courtesy Light Switch)

Switch Body

REPLACE COURTESY LIGHT SWITCH

3.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT COURTESY LIGHT SWITCH)

(a) for Driver Side

(1) Disconnect the D50 main body ECU (driver side junction block assembly) connector.

(2) Disconnect the L8 courtesy light switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D50-24 (DCTY) - L8-1	Always	Below 1 Ω
D50-24 (DCTY) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Courtesy Light Switch)

(b) for Front Passenger Side

(1) Disconnect the D49 main body ECU (driver side junction block assembly) connector.

(2) Disconnect the M8 courtesy light switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D49-21 (PCTY) - M8-1	Always	Below 1 Ω
D49-21 (PCTY) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Courtesy Light Switch)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT COURTESY LIGHT SWITCH (REAR LH SIDE OR REAR RH SIDE)

(a) Remove the courtesy light switch (See page ).

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 - Switch body	Pushed	10 kΩ or higher
1 - Switch body	Not pushed	Below 1 Ω

Text in Illustration

Component without harness connected

(Courtesy Light Switch)

Switch Body

REPLACE COURTESY LIGHT SWITCH

5.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR COURTESY LIGHT SWITCH)

(a) for Rear LH Side

(1) Disconnect the 2O main body ECU (driver side junction block assembly) connector.

(2) Disconnect the L9 courtesy light switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2O-19 (LCTY) - L9-1	Always	Below 1 Ω
2O-19 (LCTY) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Courtesy Light Switch)

(b) for Rear RH Side

(1) Disconnect the D49 main body ECU (driver side junction block assembly) connector.

(2) Disconnect the M9 courtesy light switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D49-7 (RCTY) - M9-1	Always	Below 1 Ω
D49-7 (RCTY) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Courtesy Light Switch)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (CTY) - 4 (E)	Open-latched	Below 1 Ω
3 (CTY) - 4 (E)	Half-latched	Below 1 Ω
3 (CTY) - 4 (E)	Full-latched	10 kΩ or higher
3 (CTY) - 4 (E)	Over-latched	10 kΩ or higher

REPLACE BACK DOOR LOCK ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - MAIN BODY ECU)

(a) Disconnect the D49 main body ECU (driver side junction block assembly) connector.

(b) Disconnect the R1 back door lock assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D49-25 (BCTY) - R1-3 (CTY)	Always	Below 1 Ω
D49-25 (BCTY) - Body ground	Always	10 kΩ or higher
R1-4 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Back Door Lock Assembly)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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