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 for the supplemental restraint system (see AIRBAG SYSTEM ).

INSPECT STEERING PAD SWITCH ASSEMBLY

Fig 1: Identifying Steering Pad Switch Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the switch connector.

Measure the resistance of the switch.

Standard resistance

RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
9 (AU2) - 8 (EAU)	No switch is pushed	100 kΩ or higher
9 (AU2) - 8 (EAU)	MODE switch pushed	Below 2.5 Ω
10 (AU1) - 8 (EAU)	No switch is pushed	100 kΩ or higher
10 (AU1) - 8 (EAU)	SEEK+ switch pushed	Below 2.5 Ω
10 (AU1) - 8 (EAU)	SEEK- switch pushed	329 Ω
10 (AU1) - 8 (EAU)	VOL+ switch pushed	1,000 Ω
10 (AU1) - 8 (EAU)	VOL- switch pushed	3,110 Ω

NG: REPLACE STEERING PAD SWITCH ASSEMBLY

OK: Go to next step

INSPECT SPIRAL CABLE

Disconnect the cable connectors.

Measure the resistance of the cable.

Standard resistance

RESISTANCE SPECIFICATION

Tester connection	Spiral Cable Position	Specified condition
K20-4 (EAU) - A-8 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
K20-5 (AU2) - A-9 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
K20-6 (AU1) - A-10 (AU1)	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 prevent the airbag from deploying. Be sure to read the PRECAUTION for the supplemental restraint system (see AIRBAG SYSTEM ).

Fig 2: Identifying Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK: Go to next step

CHECK WIRE HARNESS (SPIRAL CABLE - RADIO RECEIVER)

Disconnect the K56 receiver connector.
Disconnect the K20 cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K56-8 (SW2) - K20-5 (AU2)	Below 1 Ω
K56-6 (SWG) - K20-4 (EAU)	Below 1 Ω
K56-7 (SW1) - K20-6 (AU1)	Below 1 Ω
K56-8 (SW2) - Body ground	10 kΩ or higher
K56-6 (SWG) - Body ground	10 kΩ or higher
K56-7 (SW1) - Body ground	10 kΩ or higher

Fig 3: Identifying K56 Radio Receiver And K20 Spiral Cable Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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