Toyota Tacoma (2015-2018) Service Manual: Daytime Running Light Relay Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the daytime running lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- 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. |
PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT) |
(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 / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Main Body|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Daytime Running Light |
Daytime running lights |
ON/OFF |
- |
OK:
Daytime running lights illuminate.
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
INSPECT RUNNING LIGHT RELAY (DRL) |
|
(a) Remove the running light relay. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
Battery voltage not applied to terminals 1 and 2 |
10 kΩ or higher |
|
3 - 5 |
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
| NG | |
REPLACE RUNNING LIGHT RELAY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY - RUNNING LIGHT RELAY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Relay terminal 1 - Body ground |
Always |
11 to 14 V |
|
Relay terminal 3 - Body ground |
Always |
11 to 14 V |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - DRIVER SIDE JUNCTION BLOCK AND BODY GROUND) |
(a) Disconnect the 1F driver side junction block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Running light relay terminal 2 - 1F-30 |
Always |
Below 1 Ω |
|
1F-30 - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
INSPECT DRIVER SIDE JUNCTION BLOCK |
|
(a) Remove the driver side junction block. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1F-30 - MB-25 (DRL) |
Always |
Below 1 Ω |
|
1F-30 - Body ground |
Always |
10 kΩ or higher |
|
*1 |
Component without harness connected (Driver Side Junction Block) |
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPLACE DRIVER SIDE JUNCTION BLOCK |
ACC Signal Circuit
DESCRIPTION
This circuit detects whether the ignition switch is ACC or off, and sends this
information to the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
...
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 ...
Other materials:
System Diagram
SYSTEM DIAGRAM
Communication Table
Sender
Receiver
Signal
Line
ECM
Millimeter Wave Radar Sensor Assembly
Cruise control operation signal
Accelerator pedal idle position signal
Accel overr ...
System Description
SYSTEM DESCRIPTION
1. ENGINE IMMOBILISER SYSTEM DESCRIPTION
The engine immobiliser system is designed to prevent the vehicle from being stolen.
This system uses the transponder key ECU assembly that stores the key ID codes of
authorized ignition keys. If an attempt is made to start the engine ...
Meter Illumination is Always Dark
DESCRIPTION
In this circuit, the combination meter assembly receives auto dimmer signals
from the main body ECU (multiplex network body ECU) using the CAN communication
system (CAN V1 Bus). When the meter CPU receives an auto dimmer signal, it dims
the meter illumination (warning and indicato ...
