Toyota RAV4 manuals

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

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

 INSPECT RADIO RECEIVER

  1. Disconnect the radio receiver connector R4 or R9.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

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

  1. Disconnect the steering pad switch LH connector.
  2. Measure the resistance according to the values in the table below.

 INSPECT STEERING PAD SWITCH ASSEMBLY

Standard resistance

Standard resistance

3 INSPECT SPIRAL CABLE

INSPECT SPIRAL CABLE

  1. Disconnect the steering pad switch and spiral cable connectors.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

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:

TS and CG Terminal Circuit
DESCRIPTION In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is stopped is detected while driving. Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and turning the ignition switch from off ...

Installation
1. INSTALL CENTER AIRBAG SENSOR ASSEMBLY Check that the ignition switch is off. Check that the battery negative (-) terminal is disconnected. CAUTION: After disconnecting the negative battery terminal, wait for at least 90 seconds before starting the operation.  Temporar ...

Problem symptoms table
ENTIRE SYSTEM METER GAUGES WARNING LIGHTS INDICATOR LIGHTS BUZZER ACCESSORY METER ASSEMBLY ...

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