Inspection Procedure

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 Precaution in the Supplemental Restraint System (See AIRBAG SYSTEM ).

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL CABLE)

Disconnect the F23 receiver connector.
Disconnect the E12 cable connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
F23-8 (SW2) - E12-5 (AU2)	Always	Below 1 Ω
F23-6 (SWG) - E12-4 (EAU)	Always	Below 1 Ω
F23-7 (SW1) - E12-6 (AU1)	Always	Below 1 Ω
F23-8 (SW2) - Body ground	Always	10 kΩ or higher
F23-6 (SWG) - Body ground	Always	10 kΩ or higher
F23-7 (SW1) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying Radio Receiver And Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK NO. 1 SWITCH WIRE

Disconnect the z35 cable connector.
Disconnect the z51 steering pad switch connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
z35-10-z51-6	Always	Below 1 Ω.
z35-9-z51-7	Always	Below 1 Ω.
Z35-8-Z51-8	Always	Below 1 Ω
Z35-10 - Body ground	Always	10 kΩ or higher
z35-9 - Body ground	Always	10 kΩ or higher
z35-8 - Body ground	Always	10 kΩ or higher

NG: REPLACE NO. 1 SWITCH WIRE

Fig 2: Identifying Steering Pad Switch And Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT SPIRAL CABLE

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the z35 and E12 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
E12-4(EAU) - z35-8 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 3 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
E12-5(AU2) - z35-9 (AU2)	Spiral cable is turned 2.5 rotations counterclockwise	Below 3 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
E12-6(AU1) - z35-10 (AU1)	Spiral cable is turned 2.5 rotations counterclockwise	Below 3 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise

NOTE: 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 AIRBAG SYSTEM ).

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

OK: Go to Next Step

INSPECT STEERING PAD (STEERING PAD SWITCH)

Fig 4: Identifying Steering Pad Switches - W/ Dynamic Radar Cruise Control System

Fig 5: Identifying Steering Pad Switches - W/O Dynamic Radar Cruise Control System

Disconnect the z51 steering pad switch connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Switch Condition	Specified Condition
6 (AU1) - 8(EAU)	No switch is pushed	100 kΩ
6 (AU1) - 8(EAU)	Seek+ switch pushed	Below 2.5 Ω
6 (AU1) - 8(EAU)	Seek- switch pushed	329 Ω
6 (AU1) - 8(EAU)	Volume* switch pushed	1000 Ω
6 (AU1) - 8 (EAU)	Volume- switch pushed	3110 Ω
7 (AU2) - 8 (EAU)	No switch is pushed	100 kΩ
7 (AU2) - 8(EAU)	MODE switch pushed	Below 2.5 Ω
7 (AU2) - 8 (EAU)	On hook switch pushed	329 Ω
7 (AU2) - 8 (EAU)	Off hook switch pushed	1000 Ω
7 (AU2) - 8(EAU)	Voice switch pushed	3110 Ω

NG: REPLACE STEERING PAD (See REMOVAL )

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