Toyota Tacoma (2015-2018) Service Manual: Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network Body ECU) receives a door open or closed signal from each door courtesy light switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	READ VALUE USING TECHSTREAM (DOOR COURTESY LIGHT SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the Techstream, read the Data List.

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
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	-
FR Door Courtesy	Front door courtesy light switch RH signal / ON or OFF	ON: Front door RH closed OFF: Front door RH open	-
FL Door Courtesy	Front door courtesy light switch LH signal / ON or OFF	ON: Front door LH closed OFF: Front door LH open	-

OK:

Normal conditions listed above are displayed.

Result

Result	Proceed to
OK	A
NG (Rear door courtesy light switch RH does not operate)	B
NG (Rear door courtesy light switch LH does not operate)	C
NG (Front door courtesy light switch RH does not operate)	D
NG (Front door courtesy light switch LH does not operate)	E

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 5

D

GO TO STEP 8

E

GO TO STEP 10

B

2.	INSPECT REAR DOOR COURTESY LIGHT SWITCH RH

(a) for Double Cab

(1) Remove the rear door courtesy light switch RH.

(2) Inspect the rear door courtesy light switch RH (See page ).

(b) for Access Cab

(1) Remove the rear door courtesy light switch RH upper side.

(2) Remove the rear door courtesy light switch RH lower side.

(3) Inspect the rear door courtesy light switch RH upper side (See page ).

(4) Inspect the rear door courtesy light switch RH lower side (See page ).

Result

Result	Proceed to
OK	A
NG (for Double Cab)	B
NG (for Access Cab)	C

B

REPLACE REAR DOOR COURTESY LIGHT SWITCH RH

C

REPLACE REAR DOOR COURTESY LIGHT SWITCH RH

A

3.	CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH RH - DRIVER SIDE JUNCTION BLOCK)

(a) for Double Cab

(1) Disconnect the D18 rear door courtesy light switch RH connector.

(2) Disconnect the 1D driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D18-1 - 1D-30	Always	Below 1 Ω
D18-1 - Body ground	Always	10 kΩ or higher

(b) for Access Cab

(1) Disconnect the D16 and D25 rear door courtesy light switch RH connector.

(2) Disconnect the 1D driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D16-1 - 1D-30	Always	Below 1 Ω
D16-1 - Body ground	Always	10 kΩ or higher
D25-2 - 1D-30	Always	Below 1 Ω
D25-2 - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page ).

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-2 (RCTY) - 1D-30	Always	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Driver Side Junction Block)

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

5.	INSPECT REAR DOOR COURTESY LIGHT SWITCH LH

(a) for Double Cab

(1) Remove the rear door courtesy light switch LH.

(2) Inspect the rear door courtesy light switch LH (See page ).

(b) for Access Cab

(1) Remove the rear door courtesy light switch LH upper side.

(2) Remove the rear door courtesy light switch LH lower side.

(3) Inspect the rear door courtesy light switch LH upper side (See page ).

(4) Inspect the rear door courtesy light switch LH lower side (See page ).

Result

Result	Proceed to
OK	A
NG (for Double Cab)	B
NG (for Access Cab)	C

B

REPLACE REAR DOOR COURTESY LIGHT SWITCH LH

C

REPLACE REAR DOOR COURTESY LIGHT SWITCH LH

A

6.	CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH LH - DRIVER SIDE JUNCTION BLOCK)

(a) for Double Cab

(1) Disconnect the D15 rear door courtesy light switch LH connector.

(2) Disconnect the 1H driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D15-1 - 1H-36	Always	Below 1 Ω
D15-1 - Body ground	Always	10 kΩ or higher

(b) for Access Cab

(1) Disconnect the D13 and D26 rear door courtesy light switch LH connector.

(2) Disconnect the 1H driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D13-1 - 1H-36	Always	Below 1 Ω
D13-1 - Body ground	Always	10 kΩ or higher
D26-2 - 1H-36	Always	Below 1 Ω
D26-2 - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.	INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page ).

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-13 (LCTY) - 1H-36	Always	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Driver Side Junction Block)

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

8.	INSPECT FRONT DOOR COURTESY LIGHT SWITCH RH

(a) Remove the front door courtesy light switch RH.

(b) Inspect the front door courtesy light switch RH (See page ).

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH RH

OK

9.	CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the D12 front door courtesy light switch RH connector.

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D12-1 - M6-27 (FRCY)	Always	Below 1 Ω
D12-1 - Body ground	Always	10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT FRONT DOOR COURTESY LIGHT SWITCH LH

(a) Remove the front door courtesy light switch LH.

(b) Inspect the front door courtesy light switch LH (See page ).

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH LH

OK

11.	CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the D11 front door courtesy light switch LH connector.

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D11-1 - M6-6 (FLCY)	Always	Below 1 Ω
D11-1 - Body ground	Always	10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR