Toyota Tundra Service Manual: Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the door courtesy light switch assembly.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here

Main Body

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

FR Door Courtesy SW

Front door courtesy light switch assembly RH signal / OFF or ON

OFF: Front door RH closed

ON: Front door RH open

-

FL Door Courtesy SW

Front door courtesy light switch assembly LH signal / OFF or ON

OFF: Front door LH closed

ON: Front door LH open

-

RR Door Courtesy SW

Rear door courtesy light switch assembly RH signal / OFF or ON

OFF: Rear door RH closed

ON: Rear door RH open

-

RL Door Courtesy SW

Rear door courtesy light switch assembly LH signal / OFF or ON

OFF: Rear door LH closed

ON: Rear door LH open

-

OK:

Normal condition listed above are displayed.

Result

Proceed to

OK

A

NG ("FR Door Courtesy SW" is abnormal)

B

NG ("FL Door Courtesy SW" is abnormal)

C

NG ("RR Door Courtesy SW" is abnormal)

D

NG ("RL Door Courtesy SW" is abnormal)

E

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 4

D

GO TO STEP 6

E

GO TO STEP 9

B

2.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH

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

Click here

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

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH

OK

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH)

(a) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the Q5 front door courtesy light switch assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J165-27 (FRCY) - Q5-1

Always

Below 1 Ω

J165-27 (FRCY) or Q5-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

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

Click here

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

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

OK

5.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH)

(a) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the P5 front door courtesy light switch assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J165-6 (FLCY) - P5-1

Always

Below 1 Ω

J165-6 (FLCY) or P5-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY RH

(a) Remove the rear door courtesy light switch assembly RH.

Click here

(b) Inspect the rear door courtesy light switch assembly RH.

Click here

NG

REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY RH

OK

7.

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

(a) Disconnect the 3J driver side junction block assembly connector.

(b) Disconnect the Q6 rear door courtesy light switch assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3J-31 - Q6-1

Always

Below 1 Ω

3J-31 or Q6-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

Click here

*a

Component without harness connected

(Driver Side Junction Block Assembly)

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

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3J-31 - A-2 (RCTY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

9.

INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

(a) Remove the rear door courtesy light switch assembly LH.

Click here

(b) Inspect the rear door courtesy light switch assembly LH.

Click here

NG

REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

OK

10.

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

(a) Disconnect the 3K driver side junction block assembly connector.

(b) Disconnect the P6 rear door courtesy light switch assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3K-24 - P6-1

Always

Below 1 Ω

3K-24 or P6-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

Click here

*a

Component without harness connected

(Driver Side Junction Block Assembly)

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

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3K-24 - A-13 (LCTY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

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