Toyota Tacoma 2015-2018 Service Manual: Turn Signal Switch Circuit
DESCRIPTION
The combination meter assembly receives the turn signal switch information and controls the turn signal lights.
WIRING DIAGRAM
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (TURN SIGNAL 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 / Combination Meter / Data List.
(e) According to the display on the Techstream, read the Data List.
Combination Meter|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Turn Signal Switch (Right) |
Turn signal switch (right) signal / ON or OFF |
ON: Turn signal switch (right) on OFF: Turn signal switch (right) off |
- |
|
Turn Signal Switch (Left) |
Turn signal switch (left) signal / ON or OFF |
ON: Turn signal switch (left) on OFF: Turn signal switch (left) off |
- |
|
Turn Switch Signal (Full Turn) |
Turn signal switch (full turn) signal / ON or OFF |
ON: Turn signal switch (left or right) on OFF: Turn signal switch (left and right) off |
- |
OK:
Normal conditions listed above are displayed.
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY |
|
(a) Remove the C11 headlight dimmer switch assembly. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
12 (TR) - 15 (EL) |
Turn signal switch in neutral position |
10 kΩ or higher |
|
11 (TL) - 15 (EL) |
Turn signal switch in neutral position |
10 kΩ or higher |
|
13 (CR) - 15 (EL) |
Turn signal switch in neutral position |
10 kΩ or higher |
|
12 (TR) - 15 (EL) |
Turn signal switch in right turn position |
Below 1 Ω |
|
13 (CR) - 15 (EL) |
Turn signal switch in full right turn position |
Below 1 Ω |
|
11 (TL) - 15 (EL) |
Turn signal switch in left turn position |
Below 1 Ω |
|
13 (CR) - 15 (EL) |
Turn signal switch in full left turn position |
Below 1 Ω |
|
*1 |
Component without harness connected (Headlight Dimmer Switch Assembly) |
| NG | |
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - COMBINATION METERASSEMBLY AND BODY GROUND) |
(a) Disconnect the C9 combination meter assembly connector.
(b) Disconnect the C11 headlight dimmer switch assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C11-12 (TR) - C9-8 (ER) |
Always |
Below 1 Ω |
|
C11-11 (TL) - C9-7 (EL) |
Always |
Below 1 Ω |
|
C11-13 (CR) - C9-9 (SW) |
Always |
Below 1 Ω |
|
C11-12 (TR) - Body ground |
Always |
10 kΩ or higher |
|
C11-11 (TL) - Body ground |
Always |
10 kΩ or higher |
|
C11-13 (CR) - Body ground |
Always |
10 kΩ or higher |
|
C11-15 (EL) - Body ground |
Always |
Below 1 Ω |
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
IG Signal Circuit
DESCRIPTION
This circuit detects whether the ignition switch is ON or off, and sends this
information to the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
...
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
...
Other materials:
Check Bus 3 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 6 (CA3H) of the central gateway ECU (network
gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central
gateway ECU (network gateway ECU) and t ...
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs adjustment
or repair. Contact your Toyota dealer as soon as possible.
■ Visible sympt
● Fluid leaks under the vehicle (Water dripping from the air conditioning after
use is normal.)
● Flat-looking tires ...
Parts Location
PARTS LOCATION
ILLUSTRATION
*A
for Vacuum Brake Booster
*B
for Hydraulic Brake Booster
*1
SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
*2
SKID CONTROL ECU (MASTER CYLINDER SOLENOID)
*3
...