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:
Mute Signal Circuit between Radio Receiver and Stereo Component
Amplifier
DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise.
Because of that, the noise
produced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when
changing the sound source.
If there is a short i ...
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 ...
Disassembly
1. REMOVE LOWER BALL JOINT ASSEMBLY FRONT LH
(a) Remove the cotter pin and nut.
(b) Using SST(s), remove the lower ball joint assembly
front LH.
SST 09628-62011
2. REMOVE FRONT WHEEL BEARING DUST DEFLECTOR NO.1 LH
(a) Using a screwdriver, remove the bearing dust
deflector NO. 1 LH ...
