Lexus IS250 IS220d GSE20 ALE20 - AUDIO / VISUAL

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT RADIO RECEIVER

INSPECT STEERING PAD SWITCH ASSEMBLY

INSPECT SPIRAL CABLE

AUDIO AND VISUAL SYSTEM - 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

Audio And Visual System - Steering Pad Switch Circuit. AUDIO / VISUAL. Lexus IS250 IS220d GSE20 ALE20

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
Audio And Visual System - Steering Pad Switch Circuit. AUDIO / VISUAL. Lexus IS250 IS220d GSE20 ALE20

Disconnect the radio receiver connector J63.

Measure the resistance according to the value(s) in the table below.

  • Standard resistance:
  • Tester connectionConditionSpecified condition
    SW1 - SWGNo switch is pushedApprox. 100 kΩ
    SW1 - SWGSEEK+ switch: pushApprox. 0 Ω
    SW1 - SWGSEEK- switch: pushApprox. 0.3 kΩ
    SW1 - SWGVOL+ switch: pushApprox. 1 kΩ
    SW1 - SWGVOL- switch: pushApprox. 3.2 kΩ
    SW2 - SWGNo switch is pushedApprox. 100 kΩ
    SW2 - SWGMODE switch: pushApprox. 0 Ω
NG
Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2.INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the steering pad switch assembly connector k1.

Audio And Visual System - Steering Pad Switch Circuit. AUDIO / VISUAL. Lexus IS250 IS220d GSE20 ALE20

Measure the resistance according to the values in the table below.

  • Standard resistance:
  • Tester connectionConditionSpecified condition
    AU1 - EAUNo switch is pushedApprox. 100 kΩ
    AU1 - EAUSEEK+ switch: pushApprox. 0 Ω
    AU1 - EAUSEEK- switch: pushApprox. 0.3 kΩ
    AU1 - EAUVOL+ switch: pushApprox. 1 kΩ
    AU1 - EAUVOL- switch: pushApprox. 3.2 kΩ
    AU2 - EAUNo switch is pushedApprox. 100 kΩ
    AU2 - EAUMODE switch: pushApprox. 0 Ω
NG
REPLACE STEERING PAD SWITCH ASSEMBLY
OK
3.INSPECT SPIRAL CABLE
Audio And Visual System - Steering Pad Switch Circuit. AUDIO / VISUAL. Lexus IS250 IS220d GSE20 ALE20

Disconnect the steering pad switch assembly and spiral cable connectors.

Measure the resistance according to the value(s) in the table below.

  • Standard resistance:
  • Tester connectionSpiral Cable PositionSpecified condition
    EAU - EAUCenterBelow 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    AU1 - AU1CenterBelow 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    AU2 - AU2CenterBelow 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
  • 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.
  • HINT:
Removal
Installation
NG
REPLACE SPIRAL CABLE
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)
LEXUS IS250, IS220d / GSE20 ALE20
AUDIO / VISUAL
Lexus IS250 IS220d GSE20 ALE20
AUDIO AND VISUAL SYSTEM