Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 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 (See PRECAUTION ).

INSPECT RADIO RECEIVER

Disconnect the radio receiver connector

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
J63-7 (SW1) - J63-6 (SWG)	No switch is pushed	95 to 105 kΩ
J63-7 (SW1) - J63-6 (SWG)	Seek+ switch, pushed	Below 2 5 Ω
J63-7 (SW1) - J63-6 (SWG)	Seek- switch, pushed	313.5 to 346.5 Ω
J63-7 (SW1) - J63-6 (SWG)	Volume+ switch, pushed	959.5 to 1060.5 Ω
J63-7 (SW1) - J63-6 (SWG)	Volume- switch. pushed	3049 5 to 3370.5 Ω
J63-8 (SW2) - J63-6 (SWG)	No switch is pushed	95 to 105 kΩ
J63-8 (SW2) - J63-6 (SWG)	MODE switch. pushed	Below 2.5 Ω
J63-8 (SW2) - J63-6 (SWG)	Voice switch. pushed	3049.5 to 3370.5 Ω
J63-8 (SW2) - J63-6 (SWG)	On Hook switch, pushed	313.5 to 346 5 Ω
J63-8 (SW2) - J63-6 (SWG)	Off Hook switch-pushed	959.5 to 1060 5 Ω

Fig 1: Identifying Terminals Of Radio Receiver Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 2

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the steering pad switch assembly connector

Fig 2: Identifying Terminals Of Steering Pad Switch Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
k1-10 (AU1) - k1-8 (EAU)	No switch is pushed	95 to 105 kΩ
k1-10 (AU1) - k1-8 (EAU)	Seek+ switch: pushed	Below 2.5 Ω
k1-10 (AU1) - k1-8 (EAU)	Seek-switch: pushed	313.5 to 346 5 Ω
k1-10 (AU1) - k1-8 (EAU)	Volume+ switch: pushed	959.5 to 1060.5 Ω
k1-10 (AU1) - k1-8 (EAU)	Volume- switch: pushed	3049.5 to 3370.5 Ω
k1-9 (AU2) - k1-8 (EAU)	No switch is pushed	95 to 105 kΩ
k1-9 (AU2) - k1-8 (EAU)	MODE switch: pushed	Below 2 5 Ω
k1-9 (AU2) - k1-8 (EAU)	Voice switch- pushed	3049.5 to 3370.5 Ω
k1-9 (AU2) - k1-8 (EAU)	On Hook switch: pushed	313 5 to 346.5 Ω
k1-9 (AU2) - k1-8 (EAU)	Off Hook switch: pushed	959 5 to 1060 5 Ω

NG: REPLACE STEERING PAD SWITCH ASSEMBLY (See STEERING PAD SWITCH )

OK: Go to Next Step

INSPECT SPIRAL CABLE

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 CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
k1-8 (EAU) - J24-4 (EAU)	Center	Below 1 Ω
	2 5 rotations to the left
	2.5 rotations to the right
k1-10 (AU1) - J24-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
k1-9 (AU2) - J24-5 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right

NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may deploy the airbag. Be sure to read the article shown in the bracket (See REMOVAL ).

Fig 3: Identifying Terminals Of Steering Pad Switch Assembly And Spiral Cable Connector

NG: REPLACE SPIRAL CABLE (See REMOVAL )

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)