Toyota Sienna Service Manual: No. 2 Clearance Warning Buzzer Circuit
DESCRIPTION
The clearance warning ECU receives the ultrasonic sensor signal to sound the rear warning buzzer.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER)
- Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
2 INSPECT REAR BUZZER
- Remove the integration control & panel assembly with the connectors still connected.
- Using a service wire, ground the terminal Z- of the integration control & panel assembly connector.
- Turn the ignition switch ON.
- Check that the rear buzzer sounds.
HINT: The clearance warning buzzer is separately excited, and will not sound unless an alternating voltage is applied.
OK: Operating noise (clicking sounds) can be heard.
Result
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3 INSPECT PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY
- Check that the malfunction disappears when a known good printed wire integration board sub-assembly is installed.
OK: Malfunction disappears.
REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY
4 INSPECT INTEGRATION PANEL SUB-ASSEMBLY
- Check that the malfunction disappears when a known good integration panel sub-assembly is installed.
OK: Malfunction disappears
REPLACE INTEGRATION PANEL SUB-ASSEMBLY
Clearance Warning ECU Power Source Circuit
DESCRIPTION
This circuit provides power to the clearance warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER
AMPLIFIER)
...
Indicator Circuit
DESCRIPTION
The indicator displays the location of the obstacle and the approximate
distance between the vehicle and
the obstacle either by blinking or turning on.
WIRING DIAGRAM
INSPECTION ...
Other materials:
Rear combination light assembly
COMPONENTS
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
2. REMOVE REAR COMBINATION LIGHT ASSEMBLY
Remove the 2 bolts.
Disengage the 2 pins and separate the rear
combination light assembly as shown in the
illustration.
Disconnect the connector a ...
How to proceed with
troubleshooting
HINT:
Troubleshoot in accordance with the procedures on the
following pages
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK
3 INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX
COMMUNICATION SYSTEM (BEAN)
Use the intelligent tester to check for normal ...
Hood
COMPONENTS
Adjustment
HINT:
Since a centering bolt is used as a hood hinge mounting bolt
and hood lock mounting bolt, the hood and hood lock can not
be adjusted with them on. Substitute a bolt with a washer for
the centering bolt.
1. INSPECT HOOD SUB-ASSEMBLY
Check that the clearance is ...
