Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

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 (see AIRBAG SYSTEM ).

INSPECT STEERING PAD SWITCH ASSEMBLY

Fig 1: Inspecting Steering Pad Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the switch connector.

Measure the resistance of the switch.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester connection	Condition	Specified condition
9 (AU2) - 8 (EAU)	No switch is pushed	100 kΩ or higher
9 (AU2) - 8 (EAU)	VOICE switch pushed	3,110 Ω
9 (AU2) - 8 (EAU)	ON HOOK switch pushed	329 Ω
9 (AU2) - 8 (EAU)	OFF HOOK switch pushed	1,000 Ω
3 (AC1) - 7 (EAC)	Not pushed	30 kΩ or higher
3 (AC1) - 7 (EAC)	INFO switch pushed	3,062 Ω
2 (AC2) - 7 (EAC)	Not pushed	30 kΩ or higher
2 (AC2) - 7 (EAC)	MAP switch pushed	3,062 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

STANDARD RESISTANCE REFERENCE CHART

Tester connection	Spiral Cable Position	Specified condition
C12-4 (EAU) - 8 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
C12-5 (AU2) - 9 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
C12-3 (EAC) - 7 (EAC)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
C12-9 (AC2) - 2 (AC2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
C12-10 (AC1) - 3 (AC1)	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 page shown in the brackets (see REMOVAL ).

Fig 2: Inspecting Spiral Cable

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 R5 receiver connector.
Disconnect the C12 cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

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

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 3: Identifying R5 Receiver Connector And C12 Cable Connector

OK: Go to Next Step

CHECK WIRE HARNESS (SPIRAL CABLE - AIR CONDITIONING AMPLIFIER)

Disconnect the A7 amplifier connector.
Disconnect the C12 cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A7-2 (ST1) - C12-10 (AC1)	Below 1 Ω
A7-15 (SGST) - C12-3 (EAC)	Below 1 Ω
A7-1 (ST2) - C12-9 (AC2)	Below 1 Ω
A7-2 (ST1) - Body ground	10 kΩ or higher
A7-15 (SGST) - Body ground	10 kΩ or higher
A7-1 (ST2) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 4: Check Wire Harness (Spiral Cable - Air Conditioning Amplifier) Screen Display

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