Steering Pad Switch Circuit: Procedure

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL CABLE)

Disconnect the F19 receiver connector.
Disconnect the E12 cable connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
F19-8 (SW2) - E12-5 (AU2)	Always	Below 1 Ω
F19-6 (SWG) - E12-4 (EAU)
F19-7 (SW1) - E12-6 (AU1)
F19-8 (SW2) - Body ground	Always	10 kΩ or higher
F19-6 (SWG) - Body ground
F19-7 (SW1) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Fig 1: Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

Vehicle Side

Steering Pad Switch Side

Disconnect the z35 cable connectors.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E12-4 (EAU) - z35-8 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
E12-5 (AU2) - z35-9 (AU2)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
E12-6 (AU1) - z35-10 (AU1)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise

WARNING:

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 SRS.

Removal. Refer to REMOVAL .
Installation. Refer to INSTALLATION .

NG → See step 4

OK: Go to next step

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the z35 switch connector.

Fig 2: Identifying Steering Pad Switch Assembly

TEXT IN ILLUSTRATION

*1	Volume+	*2	Volume-
*3	Seek-	*4	MODE
*5	Seek+	*6	Off Hook
*7	On Hook	-	-

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

Standard Resistance

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

NG → See step 6

OK → See step 5

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to REMOVAL
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to REMOVAL