Toyota Tacoma (2015-2018) Service Manual: Low Beam Headlight Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the low beam headlights.
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
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).*1
- *1: w/ Smart Key System
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY) |
(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 |
|---|---|---|---|
|
Headlight Relay |
Headlight relays |
ON/OFF |
- |
OK:
Headlight relays operate. (Low beam headlights illuminate.)
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
INSPECT H-LP LO RELAY |
|
(a) Remove the H-LP LO relay from the engine room relay block. |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
Voltage is not applied between terminals 1 and 2 |
10 kΩ or higher |
|
3 - 5 |
Voltage is applied between terminals 1 and 2 |
Below 1 Ω |
| NG | |
REPLACE H-LP LO RELAY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY - H-LP LO RELAY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Relay terminal 2 - Body ground |
Always |
11 to 14 V |
|
Relay terminal 5 - Body ground |
Always |
11 to 14 V |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (H-LP LO RELAY - DRIVER SIDE JUNCTION BLOCK) |
(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 |
|---|---|---|
|
Relay terminal 1 - 1F-28 |
Always |
Below 1 Ω |
|
1F-28 - 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-28 - MB-15 (HRLY) |
Always |
Below 1 Ω |
|
1F-28 - Body ground |
Always |
10 kΩ or higher |
|
*a |
Component without harness connected (Driver Side Junction Block) |
| OK | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | |
REPLACE DRIVER SIDE JUNCTION BLOCK |
High Beam Headlight Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the high beam headlights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to th ...
Personal Light Assembly
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL MAP LIGHT BULB
(a) Install the 2 map light bulbs to the 2 map light sockets.
(b) Turn the 2 m ...
Other materials:
Customize Parameters
CUSTOMIZE PARAMETERS
PROCEDURE
1. CUSTOMIZE POWER WINDOW CONTROL SYSTEM
HINT:
The following items can be customized.
NOTICE:
When the customer requests a change in a function, first make sure that
the function can be customized.
Record the current settings before customizing.
...
Inverter Relay
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT INVERTER RELAY
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
...
Automatic High Beam System does not Operate or Operation Indicator does not
Illuminate
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the automatic high beam
system based on signals received from the forward recognition camera.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the combination meter assembly, always replace it with
...
