Toyota 4Runner: 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 precaution for Supplemental Restraint System (See
page .gif)
).
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) |
(a) Disconnect the G37 navigation receiver assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G37-21 (SW1) - G37-23 (SWG) |
No switch pushed |
95 to 105 kΩ |
|
Up switch pushed |
Below 2.5 Ω |
|
|
Down switch pushed |
313 to 345 Ω |
|
|
Volume+ switch pushed |
950 to 1050 Ω |
|
|
Volume- switch pushed |
2955 to 3265 Ω |
|
|
G37-22 (SW2) - G37-23 (SWG) |
No switch pushed |
95 to 105 kΩ |
|
MODE/HOLD switch pushed |
Below 2.5 Ω |
|
|
On hook switch pushed |
313 to 345 Ω |
|
|
Off hook switch pushed |
950 to 1050 Ω |
|
|
Voice switch pushed |
2955 to 3265 Ω |
|
|
G37-24 (SW3) - G37-23 (SWG) |
No switch pushed |
95 to 105 kΩ |
|
Enter switch pushed |
Below 2.5 Ω |
|
|
Back switch pushed |
313 to 345 Ω |
|
|
Right switch pushed |
950 to 1050 Ω |
|
|
Left switch pushed |
2955 to 3265 Ω |
| 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 SUB-ASSEMBLY |
(a) Inspect the spiral cable sub-assembly (See page
).
NOTICE:
- The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
- As the spiral cable sub-assembly may break, do not rotate the spiral cable sub-assembly more than the specified amount.
HINT:
- Removal (See page )
- Installation (See page )
| OK | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY) |
| NG | |
REPLACE SPIRAL CABLE 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.
NG
...
Illumination Circuit
DESCRIPTION
Power is supplied to the navigation receiver assembly and steering pad switch
assembly illumination when the light control switch is in the tail or head position.
WIRING DIAGRAM
CAU ...
Other materials about Toyota 4Runner:
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful bec ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT DIFFERENTIAL LOCK SYSTEM
(a) Inspect the indicator light.
(1) Check that the indicator light lights up approximately 1 second after the
ignition switch is turned ON.
(b) Inspect the differential lock operation.
(1) Jac ...
0.0242