Toyota Sienna Service Manual: Ignition Switch Circuit
DESCRIPTION
The Multiplex network body ECU receives the ACC and IG signals from the ignition switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
- Connect the intelligent tester to DLC3.
- Turn the ignition switch ON and push the intelligent tester main switch ON.
- Select the items below in the DATA LIST, and read the displays on the intelligent tester.
BODY NO.1:
2 INSPECT FUSE
- Inspect the ECU ACC fuse, ECU-IG fuse and AM1 fuse in instrument panel junction block assembly.
3 INSPECT RELAY
- Inspect ACC relay continuity.
Resistance
- Inspect IG1 relay continuity.
Resistance
4 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC, IG)
- Measure the voltage between the terminals as shown in the chart below.
Voltage
5 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (+B)
- Measure voltage between the terminal 1A-1 of the instrument panel junction block assembly and body ground.
Voltage
6 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- Measure voltage between the terminal 1H-10 of the instrument panel junction block assembly and body ground.
Voltage
REPAIR OR REPLACE HARNESS OR CONNECTOR
Light Sensor Circuit Malfunction
DTC B1244 Light Sensor Circuit Malfunction
DESCRIPTION
This DTC is output when failure in the light sensor circuit is detected.
DTC No.
DTC Detection Condition
Trouble Area ...
Headlight Relay Circuit
DESCRIPTION
The Multiplex network body ECU controls HEAD relay when signal is received
from headlight dimmer
switch assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY IN ...
Other materials:
Distance Control ECU Power Source Circuit
DESCRIPTION
This circuit provides power to operate the distance control ECU. The distance
control ECU determines
information about the vehicle in front based on data from the laser sensor, and
then decides how much
acceleration and/or deceleration is needed to maintain the set distance. The
...
Inspection
1. INSPECT TIRES
(a) Check the tires for wear and proper inflation
pressure.
Cold tire inflation pressure
(b) Using a dial indicator, check the runout of the tires.
Tire runout:
1.4 mm (0.055 in.) or less
2. ROTATE TIRES
HINT:
Rotate the tires as shown in the illustration.
3. INSP ...
Air Mix Damper Position Sensor Circuit (Driver Side)
DESCRIPTION
This sensor detects the position of the air mix control servo motor (air
outlet damper) and sends the
appropriate signals to the A/C amplifier. The position sensor is built in the
air mix control servo motor. The
position sensor resistance changes as the air mix control servo ...
