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
NOTICE:
- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
- If the main body ECU (multiplex network body ECU) is replaced, refer
to Registration (See page
.gif)
).*1
- *1: w/ Smart Key System
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 | .gif) |
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 |
|
.gif)
|
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 |
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 |
|
|
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 |
|
|
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 |
|
*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 |
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 |
|
|
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 |
|
|
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 |
|
*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 |
|
|
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 |
|
|
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 |
Headlight Dimmer Switch Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) receives the following switch
information:
Light control switch position is off (DRL OFF), tail, head or AUTO (DRL).
Dimmer ...
Front Fog Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the front fog lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this s ...
Other materials:
Bleeding
BLEEDING
CAUTION / NOTICE / HINT
NOTICE:
Wash off brake fluid immediately if it comes in contact with any painted surface.
HINT:
If any work is performed on the clutch system or if there is thought to be air
in the clutch lines, bleed air from the clutch hydraulic system.
PROCEDURE
1. FILL ...
ECM Communication Circuit Malfunction (C1203)
DESCRIPTION
The circuit is used to send TRAC and VSC control information from the skid control
ECU (brake actuator assembly) to the ECM, and engine control information from the
ECM to the skid control ECU (brake actuator assembly) through the CAN communication
system.
for 4WD or w/ Rear Diff ...
Illumination Circuit
DESCRIPTION
Power is supplied to the radio and display receiver assembly and steering pad
switch assembly illumination when the light control switch is in the TAIL or HEAD
position.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restrain ...
