Toyota Sienna Service Manual: Ignition Switch Circuit
DESCRIPTION
When the ignition switch is turned to the ON position, battery positive voltage is applied to terminal IG of the ECU. When battery positive voltage is applied to terminal IG of the ECU while the theft deterrent system is operating, the warning stops.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSES (ECU-IG, AM1)
- Remove the ECU-IG and AM1 fuses from the instrument panel J/B.
- Measure the resistance.
Standard resistance: Below 1 Ω
2 INSPECT RELAY (IG1)
- Remove the IG1 relay from the instrument panel J/B.
- Check the operation of the IG1 relay.
Standard resistance
3 INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
- Disconnect the I15 switch connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
4 CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (POWER SOURCE)
- Disconnect the 1A J/B connector.
- Turn the ignition switch ON.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
REPLACE INSTRUMENT PANEL J/B ASSEMBLY
Security Horn Circuit
DESCRIPTION
During the alarm sounding state, the relay in the ECU turns on and off in a
cycle of approximately 0.2
seconds, causing the security horn to sound.
WIRING DIAGRAM
INSPECTION PROC ...
Security Indicator Light Circuit
DESCRIPTION
Even when the theft deterrent system is in the disarmed state, the security
indicator blinks due to a signal
output from the immobiliser system. The security indicator blinks continuou ...
Other materials:
If you have a flat tire
(vehicles with a compact
spare tire)
Your vehicle is equipped with a spare tire. The flat tire can be
replaced with the spare tire.
For details about tires:
WARNINGIf you have a flat tire
Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and
the
wheel ...
Radio Broadcast cannot be Received or Poor Reception
INSPECTION PROCEDURE
1 CHECK RADIO AND NAVIGATION ASSEMBLY
Check the radio's automatic station search function.
Check the radio's automatic station search function
by activating it.
OK:
The radio's automatic station search function
works properly.
2 INSPECT RADIO AND NAVIGATION AS ...
Vehicle Speed Sensor "A"
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ECU.
The skid control ECU converts these wheel speed signals into a 4-pulse signal
and outputs it to the ECM
via the combination meter. The ECM determines the vehicle speed based o ...
