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 > Occupant Classification System: Trouble in Passenger Airbag ON/OFF Indicator
DESCRIPTION
The occupant classification system detects the front passenger seat condition.
It then displays the instrument panel passenger airbag assembly and front seat cushion
airbag assembly RH condition (activated/not activated) using the passenger airbag
ON/OFF indicator.
HINT:
Approxi ...
Toyota CH-R Service Manual > Front Seat Cushion Heater: Removal
REMOVAL
CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization, or registration)
that must be performed after parts are removed, installed, or replaced during the
front seat cushion heater assembly removal/installation are shown below.
Necessary Procedure Af ...