Steering Pad Switch Circuit (TO 12/2010): Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the radio receiver assembly connector.

Fig 1: Identifying Radio Receiver Assembly Connector Terminals
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
E34-7 (SW1) - E34-6 (SWG)	No switch pushed	95 to 105 kΩ
E34-7 (SW1) - E34-6 (SWG)	Seek+ switch pushed	Below 2.5 Ω
E34-7 (SW1) - E34-6 (SWG)	Seek- switch pushed	312 to 345 Ω
E34-7 (SW1) - E34-6 (SWG)	Volume+ switch pushed	950 to 1050 Ω
E34-7 (SW1) - E34-6 (SWG)	Volume- switch pushed	2954 to 3265 Ω
E34-8 (SW2) - E34-6 (SWG)	No switch pushed	95 to 105 kΩ
E34-8 (SW2) - E34-6 (SWG)	MODE switch pushed	Below 2.5 Ω
E34-8 (SW2) - E34-6 (SWG)	Voice switch pushed	2954 to 3265 Ω
E34-8 (SW2) - E34-6 (SWG)	On hook switch pushed	312 to 345 Ω
E34-8 (SW2) - E34-6 (SWG)	Off hook switch pushed	950 to 1050 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Radio 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 STEERING PAD SWITCH ASSEMBLY

Disconnect the steering pad switch assembly connector.

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

Fig 2: Identifying Steering Pad Switch Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
d1-10 (AU1) - d1-8 (EAU)	No switch pushed	95 to 105 kΩ
d1-10 (AU1) - d1-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
d1-10 (AU1) - d1-8 (EAU)	Seek- switch pushed	312 to 345 Ω
d1-10 (AU1) - d1-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
d1-10 (AU1) - d1-8 (EAU)	Volume- switch pushed	2954 to 3265 Ω
d1-9 (AU2) - d1-8 (EAU)	No switch pushed	95 to 105 kΩ
d1-9 (AU2) - d1-8 (EAU)	MODE switch pushed	Below 2.5 Ω
d1-9 (AU2) - d1-8 (EAU)	Voice switch pushed	2954 to 3265 Ω
d1-9 (AU2) - d1-8 (EAU)	On hook switch pushed	312 to 345 Ω
d1-9 (AU2) - d1-8 (EAU)	Off hook switch pushed	950 to 1050 Ω

TEXT IN ILLUSTRATION

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

NG → See step 6

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the steering pad switch assembly and spiral cable sub-assembly connectors.

Fig 3: Identifying Spiral Cable Sub-Assembly Connector Terminals
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
d1-8 (EAU) - D15-4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
d1-10 (AU1) - D15-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
d1-9 (AU2) - D15-5 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right

NOTE:

The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Be sure to read the article shown in the brackets.

HINT:

Removal. Refer to REMOVAL
Installation. Refer to INSTALLATION

TEXT IN ILLUSTRATION

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

NG → See step 5

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

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