Steering Pad Switch Circuit: Procedure

INSPECT STEERING PAD SWITCH ASSEMBLY

Disconnect the steering pad switch connector.

Fig 1: Inspecting Steering Pad Switch Assembly
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
10 (AU1) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
10 (AU1) - 8 (EAU)	SEEK+ switch: push	Below 2.5 Ω
10 (AU1) - 8 (EAU)	SEEK- switch: push	312.5 to 345.5 Ω
10 (AU1) - 8 (EAU)	VOL+ switch: push	950 to 1050 Ω
10 (AU1) - 8 (EAU)	VOL- switch: push	2954.5 to 3265.5 Ω
9 (AU2) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
9 (AU2) - 8 (EAU)	MODE switch: push	Below 2.5 Ω

NG → REPLACE STEERING PAD SWITCH ASSEMBLY

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the spiral cable connectors.

Fig 2: Inspecting Spiral Cable Sub-Assembly
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
8 (EAU) - 4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
10 (AU1) - 6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
9 (AU2) - 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 cause airbag deployment. Be sure to refer to the "See" shown in the brackets.

HINT:

Removal.Refer to REMOVAL
Installation.Refer to INSTALLATION

NG → REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)

Disconnect the E88 receiver connector.

Fig 3: Checking Harness And Connector (Spiral Cable - Radio Receiver)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the E7 cable connector.

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

Standard Resistance

Tester Connection	Specified Condition
E88-7 (SW1) - E7-6 (AU1)	Below 1 Ω
E88-8 (SW2) - E7-5 (AU2)	Below 1 Ω
E88-6 (SWG) - E7-4 (EAU)	Below 1 Ω
E88-7 (SW1) - Body ground	10 kΩ or higher
E88-8 (SW2) - Body ground	10 kΩ or higher
E88-6 (SWG) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE