Toyota Sienna Service Manual: 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 steering pad switch.
If there is a short in the circuit, the same condition as that when the switch is continuously depressed occurs.
Therefore, the radio receiver cannot be operated using the steering pad switch, and also the radio receiver itself cannot function.
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 INSPECT RADIO RECEIVER
- Disconnect the radio receiver connector R4 or R9.
- 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
2 INSPECT STEERING PAD SWITCH ASSEMBLY
- Disconnect the steering pad switch LH connector.
- Measure the resistance according to the values in the table below.
Standard resistance
3 INSPECT SPIRAL CABLE
- Disconnect the steering pad switch 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
REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)
Vehicle Speed Signal Circuit between Radio Receiver and Combination
Meter
DESCRIPTION
This circuit is necessary for the ASL (Auto Sound Leveliser) built into the
radio receiver.
Speed signals are received from the combination meter and used for the ASL.
The ASL fun ...
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
N ...
Other materials:
MPX Body ECU Stop
DTC B1200 MPX Body ECU Stop
DESCRIPTION
This DTC is detected when communication between the multiplex network body
ECU and the multiplex
network gateway ECU stops for more than 10 seconds.
DTC No.
DTC Detection Condition
Trouble Area
B1200
Body ECU comm ...
On-vehicle inspection
1. CHECK RADIATOR RESERVOIR CAP SUBASSEMBLY
a) Measure the valve opening pressure.
(1) If there are water stains or foreign matter on
rubber packings 1, 2 or 3, clean the part(s) with
water and finger scouring.
(2) Check that rubber packings 1, 2 and 3 are not
deformed, cracked or swol ...
Checking monitor status
The purpose of the monitor result (mode 06) is to allow
access to the results for on-board diagnostic monitoring tests
of specific components/systems that are not continuously
monitored. Examples are catalyst, evaporative emission
(EVAP) and thermostat.
The monitor result allows the OBD II sc ...
