Toyota Sienna Service Manual: Back-up Power Source Circuit
DESCRIPTION
This is the back-up power source for the A/C amplifier. Power is supplied even when the ignition switch is off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU-B)
(a) Remove the ECU-B fuse from the engine room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance
2 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
ACC Power Source Circuit
DESCRIPTION
This circuit supplies power to the A/C amplifier and the illumination for the
clock.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU ACC)
(a) Remove the ECU ACC fuse fr ...
Other materials:
High mounted stop light assembly
COMPONENTS
REMOVAL
1. REMOVE BACK DOOR GARNISH CENTER (w/ Rear Spoiler)
2. REMOVE REAR SPOILER COVER (w/ Rear Spoiler)
3. REMOVE CENTER STOP LIGHT ASSEMBLY
w/o Rear spoiler:
Disconnect the connector and remove the 2
screws and the center stop light assembly.
...
Brake System Malfunction
DTC P1578 Brake System Malfunction
DESCRIPTION
This DTC is output when the VSC system has a problem. Check the VSC system
when this DTC is
output
DTC No.
DTC Detection Condition
Trouble Area
P1578
The ECM receives a brake system error signal for 0.2
...
Abnormal Temperature Inside ID1 Tire
DESCRIPTION
Each tire pressure warning valve and transmitter measures the internal
temperature of its tire as well as
tire pressure, and transmits the information to the tire pressure warning ECU
along with the transmitter ID.
If the measured temperature is out of the specified range, t ...
