Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2014TACOMA BASE, 2D PICKUP, 4WD, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTNAVIGATION SYSTEM (DIAGNOSTIC CODES & SYMPTOM TESTS)NAVIGATION SYSTEMSYMPTOM TESTSSTEERING PAD SWITCH CIRCUIT [09/2013 - ]PROCEDURE

2014 Toyota Tacoma Base, 2D Pickup, 4WD, Standard Trans

Steering Pad Switch Circuit [09/2013 - ]: Procedure

2014 Toyota Tacoma Base, 2D Pickup, 4WD, Standard TransSECTION Procedure

CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

Disconnect the radio and display 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
N25-21 (SW1) - N25-23 (SWG)	No switch is pushed	99 to 101 kΩ
	Volume+ is pushed	1000 to 1020 Ω
	Volume- is pushed	3178 to 3242 Ω
	Up switch is pushed	Below 2.5 Ω
	Down switch is pushed	327 to 333 Ω
N25-22 (SW2) - N25-23 (SWG)	No switch is pushed	99 to 101 kΩ
	MODE switch is pushed	Below 2.5 Ω
	On Hook switch is pushed	327 to 333 Ω
	Off Hook switch is pushed	1000 to 1020 Ω
	Voice switch is pushed	3178 to 3242 Ω
N25-24 (SW3) - N25-23 (SWG)	No switch is pushed	99 to 101 kΩ
	Left switch is pushed	3178 to 3242 Ω
	Right switch is pushed	1000 to 1020 Ω
	ENTER switch is pushed	Below 2.5 Ω
	Back switch is pushed	327 to 333 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

NG → See step 2

OK → See step 4

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

*1	Volume+ Switch	*2	Volume- Switch
*3	Left Switch	*4	Right Switch
*5	Up Switch	*6	Down Switch
*7	ENTER Switch	*8	MODE Switch
*9	Back Switch	*10	Voice Switch
*11	Off Hook Switch	*12	On Hook Switch
*a	Component without harness connected (Steering Pad Switch Assembly)	-	-

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
z1-10 (AU1) - z1-8 (EAU)	No switch is pushed	99 to 101 kΩ
	Volume+ is pushed	1000 to 1020 Ω
	Volume- is pushed	3178 to 3242 Ω
	Up switch is pushed	Below 2.5 Ω
	Down switch is pushed	327 to 333 Ω
z1-9 (AU2) - z1-8 (EAU)	No switch is pushed	99 to 101 kΩ
	MODE switch is pushed	Below 2.5 Ω
	On Hook switch is pushed	327 to 333 Ω
	Off Hook switch is pushed	1000 to 1020 Ω
	Voice switch is pushed	3178 to 3242 Ω
z1-7 (AU3) - z1-8 (EAU)	No switch is pushed	99 to 101 kΩ
	Left switch is pushed	3178 to 3242 Ω
	Right switch is pushed	1000 to 1020 Ω
	ENTER switch is pushed	Below 2.5 Ω
	Back switch is pushed	327 to 333 Ω

NG → See step 6

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Remove the spiral cable sub-assembly connector.

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
z1-8 (EAU) - S8-4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	2.5 rotations to the right	Below 1 Ω
z1-10 (AU1) - S8-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	2.5 rotations to the right	Below 1 Ω
z1-9 (AU2) - S8-5 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	2.5 rotations to the right	Below 1 Ω
z1-7 (AU3) - S8-3 (AU3)	Center	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	2.5 rotations to the right	Below 1 Ω

TEXT IN ILLUSTRATION

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

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 articles shown in the brackets.

HINT:

Removal. Refer to REMOVAL [09/2013 - ]
Installation. Refer to INSTALLATION [09/2013 - ]

NG → See step 5

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [09/2013 - ]
REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to REMOVAL [09/2013 - ]
REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to REMOVAL [09/2013 - ]

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.