Steering Pad Switch Circuit: Procedure

WARNING: This page is about a different variant/trim than selected.

INSPECT AIR CONDITIONING CONTROL ASSEMBLY

Remove the air conditioning control assembly, refer to REMOVAL with the connectors still connected.

Fig 1: Identifying Air Conditioning Control 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
E10-4 (ADI1) - E10-9 (SG)	AUTO switch: ON	Below 2.5 Ω
E10-4 (ADI1) - E10-9 (SG)	OFF switch: ON	Approx. 329 Ω
E10-4 (ADI1) - E10-9 (SG)	TEMP+ switch: ON	Approx. 1000 Ω
E10-4 (ADI1) - E10-9 (SG)	TEMP- switch: ON	Approx. 3110 Ω

NG → See step 2

OK → See step 5

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly.
Disconnect the connector from the steering pad switch assembly.

Fig 2: Identifying 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 (Symbols)	Condition	Specified Condition
z2-3 (AC1) - z2-2 (EAC)	AUTO switch: ON	Below 2.5 Ω
z2-3 (AC1) - z2-2 (EAC)	OFF switch: ON	Approx. 329 Ω
z2-3 (AC1) - z2-2 (EAC)	TEMP+ switch: ON	Approx. 1000 Ω
z2-3 (AC1) - z2-2 (EAC)	TEMP- switch: ON	Approx. 3110 Ω

NG → See step 6

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the connector from the spiral cable sub-assembly.

Fig 3: Identifying 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
D16-10 (AC1) - z2-3 (AC1)	Center	Below 1 Ω
D16-10 (AC1) - z2-3 (AC1)	2.5 rotations to the left	Below 1 Ω
D16-10 (AC1) - z2-3 (AC1)	2.5 rotations to the right	Below 1 Ω
D16-9 (EAC) - z2-2 (EAC)	Center	Below 1 Ω
D16-9 (EAC) - z2-2 (EAC)	2.5 rotations to the left	Below 1 Ω
D16-9 (EAC) - z2-2 (EAC)	2.5 rotations to the right	Below 1 Ω

NOTE:

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. .

HINT:

The spiral cable makes a maximum of approximately 5 rotations.

NG → See step 7

OK: Go to next step

CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)

Disconnect the connector from the air conditioning control assembly.

Fig 4: Identifying E10 Air Conditioning Control (Front) & D16 Spiral Cable Sub-Assembly Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the connector from the spiral cable sub-assembly.

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

Standard resistance

Tester Connection	Condition	Specified Condition
E10-4 (ADI1) - D16-10 (AC1)	Always	Below 1 Ω
E10-9 (SG) - D16-9 (EAC)	Always	Below 1 Ω
E10-4 (ADI1) - D16-10 (AC1)	Always	10 kΩ or higher
E10-9 (SG) - D16-9 (EAC)	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 8

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to REMOVAL
REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to REMOVAL
REPLACE AIR CONDITIONING CONTROL ASSEMBLY. Refer to REMOVAL