DESCRIPTION
This circuit is necessary for the ASL (Auto Sound Leveliser) built into the radio receiver.
Speed signals are received from the combination meter and used for the ASL.
The ASL function automatically adjusts the sound data in order to enable hearing the clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).
HINT:
WIRING DIAGRAM

INSPECTION PROCEDURE
1 CHECK OPERATION OF SPEEDOMETER
OK: Actual vehicle speed and the speed indicated on the speedometer are the same.
HINT: The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.
2 INSPECT RADIO RECEIVER

*1: 6 Speaker without Rear Seat Entertainment System.
*2: 6 Speaker with Rear Seat Entertainment System

OK: Voltage pulses as shown in the illustration.
REPLACE RADIO RECEIVER
3 CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO RECEIVER)

Standard resistance

*1: 6 Speaker without Rear Seat Entertainment System.
*2: 6 Speaker with Rear Seat Entertainment System.
4 CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO RECEIVER)

Standard resistance

HINT: If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.
*1: 6 Speaker without Rear Seat Entertainment System.
*2: 6 Speaker with Rear Seat Entertainment System.
REPLACE COMBINATION METER
AVC-LAN Circuit
Vehicle Speed Signal Circuit between Stereo Component Amplifier and
Combination MeterAdjustment procedure
Hold the steering wheel and
push the lever down.
Adjust to the ideal position by
moving the steering wheel horizontally
and vertically.
After adjustment, pull the lever up
to secure the steering wheel.
...
Inspection
1. INSPECT BRAKE CYLINDER AND PISTON
(a) Check the brake cylinder bore and front disc brake
piston for rust or scoring.
2. INSPECT PAD LINING THICKNESS
(a) Using a ruler, measure the pad lining thickness.
Standard thickness:
12.0 mm (0.472 in.)
Minimum thickness:
1.0 mm (0.039 in.)
3. ...
Front Occupant Classification Sensor RH Circuit
Malfunction
DTC B1781 Front Occupant Classification Sensor RH Circuit
Malfunction
DESCRIPTION
The front occupant classification sensor RH circuit consists of the occupant
classification ECU and the
front occupant classification sensor RH.
DTC B1781 is recorded when a malfunction is detected in the fron ...