Toyota Tundra Service Manual: Door Unlock Detection Switch Circuit

Toyota Tundra Service Manual / Vehicle Interior / Lighting / Lighting System / Door Unlock Detection Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Read the Data List according to the display on the Techstream.

Click here

Main Body

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

FR Door Lock Pos

Front door RH unlock detection switch signal / LOCK or UNLOCK

LOCK: Front door RH locked

UNLOCK: Front door RH unlocked

-

FL Door Lock Pos

Front door LH unlock detection switch signal / LOCK or UNLOCK

LOCK: Front door LH locked

UNLOCK: Front door LH unlocked

-

RR-Door Lock Pos SW

Rear door unlock detection switch LH and RH signal / OFF or ON

OFF: LH and RH side rear door locked

ON: LH or RH side rear door unlocked

-

RL-Door Lock Pos SW

Rear door unlock detection switch LH and RH signal / OFF or ON

OFF: LH and RH side rear door locked

ON: LH or RH side rear door unlocked

-

OK:

Normal conditions listed above are displayed.

Result

Proceed to

OK

A

NG ("FL Door Lock Pos" is abnormal)

B

NG ("FR Door Lock Pos" is abnormal)

C

NG ("RR-Door Lock Pos SW" or "RL-Door Lock Pos SW" is abnormal)

D

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 5

D

GO TO STEP 8

B

2.

INSPECT FRONT DOOR LOCK ASSEMBLY LH

(a) Remove the front motor lock assembly LH.

for Double Cab:

for CrewMax:

(b) Inspect the front motor lock assembly LH.

for Double Cab:

for CrewMax:

NG

REPLACE FRONT DOOR LOCK ASSEMBLY LH

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the N4 front motor lock assembly LH connector.

(b) Disconnect the 3I driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N4-8 (LSSR) - 3I-13

Always

Below 1 Ω

N4-8 (LSSR) or 3I-13 - Body ground

Always

10 kΩ or higher

N4-7 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

3I-13 - A-19 (LSFL)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

5.

INSPECT FRONT DOOR LOCK ASSEMBLY RH

(a) Remove the front motor lock assembly RH.

for Double Cab:

for CrewMax:

(b) Inspect the front motor lock assembly RH.

for Double Cab:

for CrewMax:

NG

REPLACE FRONT DOOR LOCK ASSEMBLY RH

OK

6.

CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY RH - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the M4 front motor lock assembly RH connector.

(b) Disconnect the 3I driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M4-7 (LSSR) - 3I-12

Always

Below 1 Ω

M4-7 (LSSR) or 3I-12 - Body ground

Always

10 kΩ or higher

M4-8 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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

3I-12 - A-17 (LSFR)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

8.

INSPECT REAR DOOR WITH MOTOR LOCK ASSEMBLY LH

(a) Remove the rear door with motor lock assembly LH.

for Double Cab:

for CrewMax:

(b) Inspect the rear door with motor lock assembly RH.

for Double Cab:

for CrewMax:

NG

REPLACE REAR DOOR WITH MOTOR LOCK ASSEMBLY LH

OK

9.

INSPECT REAR DOOR WITH MOTOR LOCK ASSEMBLY RH

(a) Remove the rear door with motor lock assembly RH.

for Double Cab:

for CrewMax:

(b) Inspect the rear door with motor lock assembly RH.

for Double Cab:

for CrewMax:

NG

REPLACE REAR DOOR WITH MOTOR LOCK ASSEMBLY RH

OK

10.

CHECK HARNESS AND CONNECTOR (REAR DOOR WITH MOTOR LOCK ASSEMBLY LH - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the O10 rear door with motor lock assembly LH connector.

(b) Disconnect the 3I driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O10-6 (LSSR) - 3I-14

Always

Below 1 Ω

O10-6 (LSSR) or 3I-14 - Body ground

Always

10 kΩ or higher

O10-9 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.

CHECK HARNESS AND CONNECTOR (REAR DOOR WITH MOTOR LOCK ASSEMBLY RH - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the O4 rear door with motor lock assembly RH connector.

(b) Disconnect the 3I driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O4-6 (LSSR) - 3I-14

Always

Below 1 Ω

O4-6 (LSSR) or 3I-14 - Body ground

Always

10 kΩ or higher

O4-9 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

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

3I-14 - A-5 (LSWL)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

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