Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: 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 Precaution for the supplemental restraint system (See PRECAUTION ).

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - SPIRAL CABLE)

Disconnect the I24 navigation receiver assembly connector.
Disconnect the H54 spiral cable connector.

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
I24-8 (SW2) - H54-5 (AU2)	Always	Below 1 Ω
I24-6 (SWG) - H54-4 (EAU)
I24-7 (SW1) - H54-6 (AU1)
I24-8 (SW2) - Body ground	Always	10 kΩ or higher
I24-6 (SWG) - Body ground
I24-7 (SW1) - Body ground

Reconnect the spiral cable connector.
Reconnect the navigation receiver assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying I24 Navigation Receiver Assembly And H54 Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT SPIRAL CABLE

Disconnect the z12 and H54 spiral cable connectors.

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
H54-4 (EAU) - z12-8 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
H54-5(AU2) - z12-9 (AU2)	Spiral cable is turned 2.5 rotations counterclockwise
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise
H54-6(AU1) - z12-10 (AU1)	Spiral cable is turned 2.5 rotations counterclockwise
	Spiral cable is centered
	Spiral cable is turned 2.5 rotations clockwise

CAUTION: 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 Precaution for the supplemental restraint system (See PRECAUTION ).

Fig 2: Identifying z12 And H54 Spiral Cable Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reconnect the spiral cable connectors.

NG: REPLACE SPIRAL CABLE (See REMOVAL )

OK: Go to Next Step

INSPECT STEERING PAD SWITCH ASSEMBLY

Fig 3: Inspecting Steering Pad Switch Assembly

Disconnect the z12 steering pad switch assembly connector.

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Switch Condition	Specified Condition
9 (AU2) - 8 (EAU)	No switch is pushed	100 kΩ or higher
	MODE switch pushed	Below 1 Ω
	On Hook switch pushed	312 to 345 Ω
	Off Hook switch pushed	950 to 1050 Ω
	Voice switch is pushed	2954 to 3265 Ω
10(AU1) - 8(EAU)	No switch is pushed	100 kΩ or higher
	Seek+ switch pushed	Below 1 Ω
	Seek- switch pushed	312 to 345 Ω
	Volume+ switch is pushed	950 to 1050 Ω
	Volume- switch is pushed	2954 to 3265 Ω

Reconnect the steering pad switch assembly connector.

NG: REPLACE STEERING PAD SWITCH ASSEMBLY (See REMOVAL )

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )