Toyota 4Runner: Steering Pad Switch Circuit
DESCRIPTION
This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly.
If there is an open in the circuit, the radio system cannot be operated using the steering pad switch assembly.
If there is a short in the circuit, the resulting condition is the same as if a switch were continuously pressed. Therefore, the radio and display receiver assembly cannot be operated using the steering pad switch assembly, and the radio and display receiver assembly itself cannot function.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with an SRS (Supplemental Restraint System). Before servicing
(including removal or installation of parts), be sure to read the precaution for
Supplemental Restraint System (See page .gif)
).
PROCEDURE
|
1. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Disconnect the G49 radio and display receiver assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G49-21 (SW1) - G49-23 (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 |
|
|
G49-22 (SW2) - G49-23 (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 |
|
|
G49-24 (SW3) - G49-23 (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 |
|
*a |
Front view of wire harness connector (to Radio and Display 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 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.
HINT:
- Removal (See page )
- Installation (See page )
| OK | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND DISPLAY RECEIVER - SPIRAL CABLE SUB-ASSEMBLY) |
| NG | |
REPLACE SPIRAL CABLE SUB-ASSEMBLY |
Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION
for Automatic Sound Levelizer (ASL):
This circuit is necessary for the Automatic Sound Levelizer (ASL) built
into the radio and display receiver assembly.
The Automatic So ...
Illumination Circuit
DESCRIPTION
Power is supplied to the radio and display receiver assembly and steering pad
switch illumination when the light control switch is in the tail or head position.
WIRING DIAGRAM
CAUTI ...
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TERMINALS OF ECM
1. CHECK ECM
HINT:
The standard voltage at each ECM terminal is shown in the table below.
In the table, first follow the information under "Condition". Look under "Terminal
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Lost Communication with ECM / PCM (U0100,U0129,U0142,U0155)
DESCRIPTION
The power management control ECU receives information from 2 sources. It receives
information via a direct line and via the CAN communication line. If the information
from these 2 sources is inconsistent, this DTC is stored.
HINT:
When the p ...
0.0259