Toyota Sienna Service Manual: Illumination Circuit
DESCRIPTION
Power is supplied to the radio receiver and steering pad switch illumination when the light control switch is in the TAIL or HEAD position.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE: The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the supplemental restraint system
1 CHECK ILLUMINATION
- Check if the illumination for the radio receiver, steering pad switch, glove box or others (hazard switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.
Result
2 CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE)
- Disconnect the spiral cable connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
3 INSPECT STEERING PAD SWITCH ASSEMBLY
- Disconnect the steering pad switch connector.
- Connect the positive (+) lead to terminal ILL+ and the negative (-) lead to terminal EAU of the steering pad switch assembly connector.
- Check if the illumination for the steering pad switch assembly comes on.
OK: Illumination for the steering pad switch assembly comes on.
4 INSPECT SPIRAL CABLE
- Disconnect the steering pad switch and and spiral cable connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
NOTICE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets
5 CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)
- Disconnect the connectors from the radio receiver and spiral cable.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
*1: 10 Speaker without Navigation System
*2: 6 Speaker with Rear Seat Entertainment System
*3: 6 Speaker without Rear Seat Entertainment System
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6 CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER)
- Disconnect the radio receiver connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
*1: 10 Speaker without Navigation System
*2: 6 Speaker with Rear Seat Entertainment System
*3: 6 Speaker without Rear Seat Entertainment System
7 CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)
- Disconnect the radio receiver connector and combination meter connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
*1: 10 Speaker without Navigation System
*2: 6 Speaker with Rear Seat Entertainment System
*3: 6 Speaker without Rear Seat Entertainment System
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
Steering Pad Switch Circuit
DESCRIPTION
This circuit sends an operation signal from the steering pad switch to the
radio receiver.
If there is an open in the circuit, the audio system cannot be operated using
the steerin ...
Speaker Circuit
DESCRIPTION
When the vehicle has a built-in type amplifier, a sound signal is
sent from the radio receiver to the
speakers via the "6 Speaker System" circuit.
When the ...
Other materials:
Idle Control System Malfunction
DTC P0505 Idle Control System Malfunction
DESCRIPTION
The idling speed is controlled by the ETCS (Electronic Throttle Control
System). The ETCS is comprised
of: 1) the one valve type throttle body; 2) the throttle actuator, which
operates the throttle valve; 3) the
Throttle Position (TP) sen ...
Starting the engine
Check that the parking brake is set.
Check that the shift lever is set in P.
Firmly depress the brake pedal.
The engine switch indicator will turn green. If the indicator does not turn
green, the engine cannot be started.
Press the engine switch.
The engine will crank until it sta ...
Front No. 1 speaker
COMPONENTS
ON-VEHICLE INSPECTION
1. INSPECT FRONT NO.1 SPEAKER
HINT:
Remove interior parts so that the front No.1 speaker can
be seen.
Check the speaker installation.
OK:
The speaker is securely installed.
If the result is not as specified, reinstall the front
No.1 spe ...