Toyota Tacoma (2015-2018) Service Manual: Taillight Relay Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.
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 (TAILLIGHT 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 |
|---|---|---|---|
|
Taillight Relay |
Taillight relay |
ON/OFF |
- |
OK:
Taillight relay operates. (Taillights illuminate.)
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (BATTERY - DRIVER SIDE JUNCTION BLOCK) |
(a) Disconnect the 1K driver side junction block connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1K-1 - Body ground |
Always |
11 to 14 V |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
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.
Text in Illustration
|
*a |
Component without harness connected (Driver Side Junction Block) |
- |
- |
(c) Connect a positive (+) lead from the battery to terminal 1K-1.
(d) Connect a negative (-) lead from the battery to terminal MB-14 (TRLY).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1F-3 - Battery negative terminal |
Always |
11 to 14 V |
| OK | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | |
REPLACE DRIVER SIDE JUNCTION BLOCK |
Engine Switch Illumination Circuit
DESCRIPTION
The illuminated entry system controls the engine switch illumination.
WIRING DIAGRAM
PROCEDURE
1.
READ VALUE USING TECHSTREAM (POWER/ENGINE SW LIGHT)
...
Cargo Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) receives a cargo light information
signal from the deck light switch assembly and door courtesy light switch, and illuminates
the cargo ...
Other materials:
Ptc Heater Relay
Components
COMPONENTS
ILLUSTRATION
Inspection
INSPECTION
PROCEDURE
1. INSPECT PTC HEATER RELAY
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
C ...
No Response from Steering Lock ECU (B2786)
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart
key ECU assembly) and steering lock ECU (steering lock actuator or upper bracket
assembly) stops for 10 seconds or more.
DTC No.
DTC Detection Condition
Trouble Area
...
Removal
REMOVAL
PROCEDURE
1. REMOVE SLIDING ROOF SIDE GARNISH LH
(a) Fully open the sunshade trim sub-assembly.
(b) Remove the sliding roof side garnish LH.
2. REMOVE SLIDING ROOF SIDE GARNISH RH
HINT:
Use the same procedure as for the LH side.
3. ...
