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:
Power easy access system
The seat is automatically adjusted to allow the driver to enter and exit
the vehicle easily.
When all of the following have
been performed, the driver’s seat
is automatically adjusted to a
position that allows driver to enter
and exit the vehicle easily.
The shift lever has been sh ...
Personal/interior
lights
Front
Turns the light on/off
Rear
Turns the light on/off
When the personal/interior light main switch is in the off position, the
rear personal lights will not turn on even if the switch is on.
Type A
Type B
...
Diagnosis system
1. DESCRIPTION
(a) Release the parking brake pedal.
(b) Check the warning lights.
When ignition switch is turned ON, check that the
ABS warning light and brake warning light come on
for 3 seconds.
HINT:
When parking brake is applied or the level of the
brake fluid is low, the bra ...
