DESCRIPTION
The Automatic Sound Levelizer (ASL) function automatically adjusts the audio system volume level in order to compensate for increased vehicle noise (vehicle noise tends to increase as vehicle speed increases). The ASL adjusts the volume level based upon vehicle speed signals sent from the combination meter assembly.
The radio receiver assembly recognizes that the vehicle is being driven and makes it impossible to connect or register a "Bluetooth" device while driving.
HINT:
WIRING DIAGRAM
PROCEDURE
1. |
INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
(a) Check the output waveform.
*a |
Component with harness connected (Combination Meter Assembly) |
- |
- |
(1) Remove the combination meter assembly with the connector still connected.
(2) Connect an oscilloscope to terminal F4-6 (+S) and body ground.
(3) Turn the ignition switch to ON.
(4) Turn a wheel slowly.
(5) Check the signal waveform according to the condition(s) in the table below.
Item |
Condition |
---|---|
Measurement terminal |
F4-6 (+S) - Body ground |
Tool setting |
5 V/DIV., 20 ms./DIV. |
Vehicle condition |
Wheel being rotated |
OK:
The waveform is similar to that shown in the illustration.
HINT:
When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
NG | ![]() |
GO TO METER / GAUGE / DISPLAY |
|
2. |
INSPECT RADIO RECEIVER ASSEMBLY (INPUT WAVEFORM) |
(a) Check the output waveform.
*a |
Component with harness connected (Radio Receiver Assembly) |
- |
- |
(1) Remove the combination meter assembly with the connector still connected.
(2) Connect an oscilloscope to terminal F47-17 (SPD) and body ground.
(3) Turn the ignition switch to ON.
(4) Turn a wheel slowly.
(5) Check the signal waveform according to the condition(s) in the table below.
Item |
Condition |
---|---|
Measurement terminal |
F47-17 (SPD) - Body ground |
Tool setting |
5 V/DIV., 20 ms./DIV. |
Vehicle condition |
Wheel being rotated |
OK:
The waveform is similar to that shown in the illustration.
HINT:
When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
OK | ![]() |
REPLACE RADIO RECEIVER ASSEMBLY |
|
3. |
CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the F47 radio receiver assembly connector.
(b) Disconnect the F4 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F47-17 (SPD) - F4-6 (+S) |
Always |
Below 1 Ω |
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota CH-R Service Manual > Smart Key System(for Start Function): Power Source Mode does not Change to ON (ACC)
DESCRIPTION
If the engine switch is pressed with the electrical key transmitter sub-assembly
in the cabin, the certification ECU (smart key ECU assembly) receives a signal and
changes the power source mode.
Related Data List and Active Test Items
Problem Symptom
Data Lis ...
Toyota CH-R Service Manual > Seat Belt Warning System(w/o Occupant Classification System): Parts Location
PARTS LOCATION
ILLUSTRATION
*1
BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)
*2
ECM
ILLUSTRATION
*1
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*2
INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- ECU-DC ...