Steering Pad Switch Circuit: Procedure

INSPECT NAVIGATION RECEIVER ASSEMBLY

Disconnect the E3 navigation receiver assembly connector.

Fig 1: Identifying E3 Navigation Receiver Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
E3-7 (SW1) - E3-6 (SWG)	No switch pushed	95 to 105 kΩ
E3-7 (SW1) - E3-6 (SWG)	Seek+ switch pushed	Below 2.5 Ω
E3-7 (SW1) - E3-6 (SWG)	Seek- switch pushed	312 to 345 Ω
E3-7 (SW1) - E3-6 (SWG)	Volume+ switch pushed	950 to 1050 Ω
E3-7 (SW1) - E3-6 (SWG)	Volume- switch pushed	2954 to 3265 Ω
E3-8 (SW2) - E3-6 (SWG)	No switch pushed	95 to 105 kΩ
E3-8 (SW2) - E3-6 (SWG)	MODE switch pushed	Below 2.5 Ω
E3-8 (SW2) - E3-6 (SWG)	Voice switch pushed	2954 to 3265 Ω
E3-8 (SW2) - E3-6 (SWG)	On Hook switch pushed	312 to 345 Ω
E3-8 (SW2) - E3-6 (SWG)	Off Hook switch pushed	950 to 1050 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Navigation Receiver Assembly)

NG → See step 3

OK → See step 2

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE

INSPECT SPIRAL CABLE

Disconnect the z2 steering pad switch assembly and D16 spiral cable connectors.

Fig 2: Inspecting Z2 Steering Pad Switch Assembly And D16 Spiral Cable Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
z2-8 (EAU) - D16-4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
z2-10 (AU1) - D16-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
z2-9 (AU2) - D16-5 (AU2)	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.

HINT:

Removal, refer to REMOVAL
Installation, refer to INSTALLATION

TEXT IN ILLUSTRATION

*a	Component without harness connected (Spiral Cable)
*b	Steering Pad Switch Side
*c	Vehicle Side

NG → See step 5

OK: Go to next step

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the z2 steering pad switch assembly connector.

Fig 3: Identifying Z2 Steering Pad Switch Assembly Connector

TEXT IN ILLUSTRATION

*a	Component without harness connected (Steering Pad Switch Assembly)	*b	Volume-
*c	Volume+	*d	Seek-
*e	Seek+	*f	MODE
*g	On Hook	*h	Off Hook
*i	Voice	-	-

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
z2-10 (AU1) - z2-8 (EAU)	No switch pushed	95 to 105 kΩ
z2-10 (AU1) - z2-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
z2-10 (AU1) - z2-8 (EAU)	Seek- switch pushed	312 to 345 Ω
z2-10 (AU1) - z2-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
z2-10 (AU1) - z2-8 (EAU)	Volume- switch pushed	2954 to 3265 Ω
z2-9 (AU2) - z2-8 (EAU)	No switch pushed	95 to 105 kΩ
z2-9 (AU2) - z2-8 (EAU)	MODE switch pushed	Below 2.5 Ω
z2-9 (AU2) - z2-8 (EAU)	Voice switch pushed	2954 to 3265 Ω
z2-9 (AU2) - z2-8 (EAU)	On Hook switch pushed	312 to 345 Ω
z2-9 (AU2) - z2-8 (EAU)	Off Hook switch pushed	950 to 1050 Ω

NG → See step 6

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE)

REPLACE SPIRAL CABLE. Refer to REMOVAL
REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to REMOVAL