Inspection Procedure

NOTE: The vehicle is equipped with an SRS such as the airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the airbag system (See SYSTEM DESCRIPTION ).

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the z1 steering pad switch connector.

Fig 1: Inspecting Steering Pad Switch Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Switch Condition	Specified Condition
10 (AU1) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
10 (AU1) - 8 (EAU)	SEEK+ switch: push	Below 2.5 Ω
10 (AU1) - 8 (EAU)	SEEK- switch: push	312.5 to 345.5 Ω
10 (AU1) - 8 (EAU)	VOL+ switch: push	950 to 1050 Ω
10 (AU1) - 8 (EAU)	VOL- switch: push	2954.5 to 3265.5 Ω
9 (AU2) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
9 (AU2) - 8 (EAU)	MODE switch: push	Below 2.5 Ω
9 (AU2) - 8 (EAU) (*1)	VOICE switch: push	2954.5 to 3265.5 Ω
9 (AU2) - 8 (EAU) (*1)	ON HOOK switch: push	312.5 to 345.5 Ω
9 (AU2) - 8 (EAU) (*1)	OFF HOOK switch: push	950 to 1050 Ω
HINT: *1: for Separate Type Amplifier System

NG: REPLACE STEERING PAD SWITCH ASSEMBLY

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

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

Standard Resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
E7-4 (EAU) - z1-8 (EAU)	Below 1 Ω
E7-6 (AU1) - z1-10 (AU1)	Below 1 Ω
E7-5 (AU2) - z1-9 (AU2)	Below 1 Ω

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

Fig 2: Inspecting Spiral Cable Sub-Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)

Disconnect the E49 receiver connector.
Disconnect the E7 cable connector.
Measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
E49-7 (SW1) - E7-6 (AIM)	Below 1 Ω
E49-8 (SW2) - E7-5 (AU2)	Below 1 Ω
E49-6 (SWG) - E7-4 (EAU)	Below 1 Ω
E49-7 (SW1) - Body ground	10 kΩ or higher
E49-8 (SW2) - Body ground	10 kΩ or higher
E49-6 (SWG) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Checking Harness And Connector (Spiral Cable - Radio Receiver)

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