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 > Charging System: Parts Location
PARTS LOCATION
ILLUSTRATION
*1
GENERATOR ASSEMBLY
*2
ECM
*3
NO. 1 ENGINE ROOM RELAY BLOCK
- ECU-B NO. 3 FUSE
-
-
ILLUSTRATION
*1
COMBINATION METER ASSEMBLY
...
KIA Niro EV / Hybrid (SG2) - (2021-2023) - Owner's manual > Air bag - supplemental restraint system: SRS components and functions
* The actual features in your vehicle may
not necessarily be available due to the
selected options or regions.
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Curtain air bag modules*
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