Toyota Sienna Service Manual: 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)
- 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 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 INSPECT CLEARANCE WARNING ECU
- Disconnect the clearance warning ECU connector.
- Turn the ignition switch ON.
- Turn the clearance sonar main switch ON.
- Measure the voltage between terminals +B and E of the ECU.
Standard voltage: 10 to 14 V
Result
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4 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
5 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
No. 1 Clearance Warning Buzzer Circuit
DESCRIPTION
The clearance warning ECU receives the ultrasonic sensor signal to sound the
front warning buzzer.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FRONT BUZZER
Remove the c ...
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 WAR ...
Other materials:
Removal
1. REMOVE FRONT WIPER ARM HEAD CAP
Using a small screwdriver, remove the 2 front wiper
arm covers.
HINT:
Tape up the screwdriver tip before use.
2. REMOVE FR WIPER ARM RH
Operate the wiper, and stop the windshield wiper
motor assembly to the automatic stop position.
...
Removal
1. REMOVE ENGINE ASSEMBLY WITH TRANSAXLE
HINT:
See page EM-26
2. REMOVE OIL LEVEL GAUGE GUIDE SUBASSEMBLY
(See page EM-39)
3. REMOVE NO. 1 OIL PIPE (See page EM-77)
4. REMOVE OIL PIPE (See page EM-77)
5. REMOVE CRANKSHAFT PULLEY (See page EM-79)
6. SEPARATE OIL COOLER PIPE
(a) Remove th ...
Inspection
1. INSPECT OIL PUMP ASSEMBLY
(a) Turn the drive gear with the 2 screwdrivers and
make sure that it rotates smoothly.
NOTICE:
Be careful not to damage the oil seal lip.
2. INSPECT CLEARANCE OF OIL PUMP ASSEMBLY
(a) Push the driven gear to one side of the body.
(b) Using ...
