Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: 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 PRECAUTION in the Supplemental Restraint System (see PRECAUTION ).

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL CABLE)

Disconnect the L52 receiver connector.
Disconnect the L24 cable connector.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
L52-8 (SW2) - L24-11 (AU2)	Always	Below 1 Ω
L52-6 (SWG) - L24-10 (EAU)
L52-7 (SW1) - L24-5 (AU1)
L52-8 (SW2) - Body ground	Always	10 kΩ or higher
L52-6 (SWG) - Body ground
L52-7 (SW1) - Body ground

Fig 1: Identifying L52 And L24 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT SPIRAL CABLE

Fig 2: Identifying Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the z7 and L24 cable connectors.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
L24-10 (EAU) - z7-3 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
L24-11 (AU2) - z7-4 (AU2)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
L24-5 (AU1) - z7-9 (AU1)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise

CAUTION: 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 PRECAUTION for the supplemental restraint system (see PRECAUTION ).

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY (See REMOVAL )

OK: Go to next step

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the z7 switch connector.

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

Fig 3: Identifying Steering Pad Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
9 (AU1) - 3 (EAU)	No switch is pushed	100 kΩ
9 (AU1) - 3 (EAU)	Seek+ switch pushed	Below 1 Ω
9 (AU1) - 3 (EAU)	Seek- switch pushed	330 Ω
9 (AU1) - 3 (EAU)	Volume+ switch pushed	1000 Ω
9 (AU1) - 3 (EAU)	Volume- switch pushed	3110 Ω
4 (AU2) - 3 (EAU)	No switch is pushed	100 kΩ
4 (AU2) - 3 (EAU)	MODE switch pushed	Below 1 Ω
4 (AU2) - 3 (EAU)	ON hook switch pushed	330 Ω
4 (AU2) - 3 (EAU)	OFF hook switch pushed	1000 Ω
4 (AU2) - 3 (EAU)	Voice switch pushed	3110 Ω

NG: Go to step 4

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

INSPECT STEERING PAD SWITCH ASSEMBLY (STEERING PAD SIDE)

Fig 4: Identifying Steering Pad Switch Assembly Connector Terminals

Disconnect the z8 switch connector

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Switch Condition	Specified Condition
7 (AU2-1) - 3 (EAU-1)	No switch is pushed	1000 kΩ or higher
7 (AU2-1) - 3 (EAU-1)	MODE switch pushed	Below 1 Ω
7 (AU2-1) - 10 (AU2-3)	No switch is pushed	1010 Ω
7 (AU2-1) - 3 (EAU-1)	ON Hook switch pushed	330 Ω
7 (AU2-1) - 3 (EAU-1)	OFF Hook switch pushed	1010 Ω
6 (AU1-1) - 3 (EAU-1)	No switch is pushed	1000 kΩ or higher
6 (AU1-1) - 3 (EAU-1)	Seek+ switch pushed	Below 2.5 Ω
6 (AU1-1) - 3 (EAU-1)	Seek- switch pushed	329 Ω
6 (AU1-1) - 9 (AU1-2)	No switch is pushed	330 Ω

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

OK: REPLACE STEERING PAD SWITCH ASSEMBLY (STEERING WHEEL SIDE) (See REMOVAL )