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 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 radio and display receiver assembly cannot be operated using the steering pad switch assembly, and the radio and display receiver assembly itself will not 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.
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PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) |
(a) Disconnect the F129 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 |
---|---|---|
F129-21 (SW1) - F129-24 (SWG) |
No switch pushed |
95 to 105 kΩ |
Seek+ switch pushed |
Below 2.5 Ω |
|
Seek- switch pushed |
313 to 345 Ω |
|
Volume+ switch pushed |
950 to 1050 Ω |
|
Volume- switch pushed |
2955 to 3265 Ω |
|
F129-22 (SW2) - F129-24 (SWG) |
No switch pushed |
95 to 105 kΩ |
MODE switch pushed |
Below 2.5 Ω |
|
On/off hook switch pushed |
950 to 1050 Ω |
|
Voice switch pushed |
2955 to 3265 Ω |
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Remove the steering pad switch assembly.
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(b) Inspect the steering pad switch assembly.
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NG | ![]() |
REPLACE STEERING PAD SWITCH ASSEMBLY |
|
3. |
INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Remove the spiral cable sub-assembly.
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(b) Inspect the spiral cable sub-assembly.
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OK | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY) |
NG | ![]() |
REPLACE SPIRAL CABLE SUB-ASSEMBLY |
Toyota CH-R Service Manual > Audio And Visual System(for Radio And Display Type): Display does not Dim when Light Control Switch is Turned ON
CAUTION / NOTICE / HINT
NOTICE:
Depending on the parts that are replaced during vehicle inspection or
maintenance, performing initialization, registration or calibration may
be needed. Refer to Precaution for Audio and Visual System.
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When replacing the ...
Toyota CH-R Service Manual > Meter / Gauge System: Meter Illumination is Always Dark
DESCRIPTION
The combination meter assembly receives signals from this circuit to adjust the
illumination of the combination meter assembly. The combination meter assembly sets
the illumination level based on the user operation of the light control rheostat
switch.
WIRING DIAGRAM
CAUTION / ...