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 precautionary notice for the Supplemental Restraint System.

CHECK STEERING PAD SWITCH CIRCUIT

Disconnect the R5 receiver connector.

Measure the resistance of the wire harness side connector.

Fig 1: Identifying R5 Receiver Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
R5-7 (SW1) - R5-6 (SWG)	No switch is pushed	Approx. 100 kΩ
R5-7 (SW1) - R5-6 (SWG)	SEEK+ switch is pushed	Below 2.5 Ω
R5-7 (SW1) - R5-6 (SWG)	SEEK-switch is pushed	Approx. 320 Ω
R5-7 (SW1) - R5-6 (SWG)	VOL+ switch is pushed	Approx. 1 kΩ
R5-7 (SW1) - R5-6 (SWG)	VOL-switch is pushed	Approx. 3.2 kΩ
R5-8 (SW2) - R5-6 (SWG)	No switch is pushed	Approx. 100 kΩ
R5-8 (SW2) - R5-6 (SWG)	MODE switch is pushed	Below 2.5 Ω
R5-8 (SW2) - R5-6 (SWG)	VOICE switch is pushed	3,110 Ω
R5-8 (SW2) - R5-6 (SWG)	ON HOOK switch is pushed	329 Ω
R5-8 (SW2) - R5-6 (SWG)	OFF HOOK switch is pushed	1,000 Ω

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

NG: Go to next step

INSPECT STEERING PAD SWITCH

Fig 2: Identifying Steering Pad Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the steering pad switch connector.

Measure the resistance of the wire harness side connector.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
10 (AU1) - 8 (EAU)	No switch is pushed	Approx. 100 kΩ
10 (AU1) - 8 (EAU)	SEEK+ switch is pushed	Below 2,5 Ω
10 (AU1) - 8 (EAU)	SEEK-switch is pushed	Approx. 320 Ω
10 (AU1) - 8 (EAU)	VOL+ switch is pushed	Approx. 1 kΩ
10 (AU1) - 8 (EAU)	VOL- switch is pushed	Approx. 3.2 kΩ
9 (AU2) - 8 (EAU)	No switch Is pushed	Approx. 100 kΩ
9 (AU2) - 8 (EAU)	MODE switch is pushed	Below 2.5 Ω
9 (AU2) - 8 (EAU)	VOICE switch is pushed	3,110 Ω
9 (AU2) - 8 (EAU)	ON HOOK switch is pushed	329 Ω
9 (AU2) - 8 (EAU)	OFF HOOK switch is pushed	1,000 Ω

NG: REPLACE STEERING PAD SWITCH

OK: Go to next step

INSPECT SPIRAL CABLE

Disconnect the steering pad switch connector.
Disconnect the spiral cable connector.

Measure the resistance of the cable.

Standard resistance

STANDARD RESISTANCE

Tester connection	Spiral Cable Position	Specified condition
A-8 (EAU) - C12-4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2,5 rotations to the right
A-10 (AU1) - C12-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2,5 rotations to the right
A-9 (AU2) - C12-5 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2,5 rotations to the right

Fig 3: Identifying Steering Pad Switch Connector

NOTE: The spiral cable is an important part of the SRS. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the SRS section's precaution.

NG: REPLACE SPIRAL CABLE

OK: Go to next step

CHECK WIRE HARNESS (SPIRAL CABLE - RADIO RECEIVER)

Disconnect the R5 receiver connector.
Disconnect the C12 cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
R5-7 (SW1) - C12-6 (AU1)	Below 1 Ω
R5-8 (SW2) - C12-5 (AU2)	Below 1 Ω
R5-6 (SWG) - C12-4 (EAU)	Below 1 Ω
R5-7 (SW1) - Body ground	10 kΩ or higher
R5-8 (SW2) - Body ground	10 kΩ or higher
R5-6 (SWG) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 4: Identifying R5 Receiver Connector And C12 Cable Connector

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