Toyota Tacoma (2015-2018) Service Manual: Steering Pad Switch Circuit
DESCRIPTION
This circuit sends an operation signal from the steering pad switch assembly to the navigation receiver assembly.
If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.
If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.
Therefore, the navigation receiver assembly cannot be operated using the steering pad switch assembly, and also the navigation receiver assembly itself cannot function.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes
components such as airbags. Before servicing (including removal or installation
of parts), be sure to read the precautionary notice for the Supplemental Restraint
System (See page .gif)
).
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) |
|
(a) Disconnect the navigation receiver assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
N25-21 (SW1) - N25-23 (SWG) |
No switch is pushed |
99 to 101 kΩ |
|
Volume+ is pushed |
1000 to 1020 Ω |
|
|
Volume- is pushed |
3178 to 3242 Ω |
|
|
Seek+ is pushed |
Below 2.5 Ω |
|
|
Seek- is pushed |
327 to 333 Ω |
|
|
N25-22 (SW2) - N25-23 (SWG) |
No switch is pushed |
99 to 101 kΩ |
|
MODE switch is pushed |
Below 2.5 Ω |
|
|
On Hook switch is pushed |
327 to 333 Ω |
|
|
Off Hook switch is pushed |
1000 to 1020 Ω |
|
|
Voice switch is pushed |
3178 to 3242 Ω |
|
*a |
Front view of wire harness connector (to Navigation Receiver Assembly) |
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly (See page
).
(b) Inspect the steering pad switch assembly (See page
).
| NG | |
REPLACE STEERING PAD SWITCH ASSEMBLY |
|
|
3. |
INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY |
(a) Remove the spiral cable with sensor sub-assembly (See page
).
(b) Inspect the spiral cable with sensor sub-assembly (See page
).
| OK | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY) |
| NG | |
REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY |
Black Screen
PROCEDURE
1.
CHECK DISPLAY SETTING
(a) Check that the display is not in "Screen Off" mode.
OK:
The display setting is not in "Screen Off" mode. ...
Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION
for Navigation Function:
The navigation receiver assembly receives a vehicle speed signal from
the combination meter assembly and sends the signal to navigation receiver
...
Other materials:
Low Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1271,C1272,C1401,C1402)
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ECU (master cylinder solenoid). These signals are used for brake
control.
The speed sensor rotors have rows of alternating N and S magnetic poles and their
magnetic fields change when t ...
Blower Motor Circuit
DESCRIPTION
The blower motor with fan sub-assembly operates according to signals from the
air conditioning amplifier assembly. The blower motor with fan sub-assembly speed
signals are transmitted by changes in the duty ratio.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuse ...
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the negative (-)
battery terminal notices before p ...
