Inspection Procedure

NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System) such as the airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (See PRECAUTION ).

CHECK ILLUMINATION

Check if the illumination for the navigation receiver assembly, steering pad switch, glove box or others (Hazard switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

Result

RESULT REFERENCE

Condition	Proceed to
Illumination comes on for all components except steering pad switch.	A
Illumination comes on for all components except navigation receiver assembly.	B
No illumination comes on (radio receiver, hazard switch, glove box, etc.)	C
Illumination comes on only for glove box and steering pad switch.	D

B: Go to step 7

C: Go to LIGHTING SYSTEM

D: Go to COMBINATION METER SYSTEM

A: Go to next step.

CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE SUB-ASSEMBLY)

Disconnect the spiral cable sub-assembly connector.

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

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester connection	Condition	Specified condition
ILL+ - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Fig 1: Identifying Spiral Cable Sub-Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

CHECK STEERING PAD SWITCH ASSEMBLY

Disconnect the steering pad switch assembly connector.

Fig 2: Connecting Positive And Negative Leads To Terminals Steering Pad Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the steering pad switch connector.
Connect the positive (+) lead to terminal ILL+ and the negative (-) lead to terminal EAU of the steering pad switch connector.

Check if the illumination for the steering pad switch comes on.

RESULT REFERENCE

Result	Proceed to
Illumination does not come on for either the steering pad switch LH RH.	A
Illumination comes on for only the steering pad switch LH.	B
Illumination comes on for only the steering pad switch RH.	C

B: Go to step 6

C: REPLACE STEERING PAD SWITCH LH

A: Go to next step.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the steering pad switch and spiral cable sub-assembly connectors.

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Spiral Cable Position	Specified Condition
EAU - EAU	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
ILL+ - ILL+	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 prevent the airbag from deploying. Be sure to read the information shown in the brackets (See INSPECTION ).

Fig 3: Identifying Spiral Cable (ILL+) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - NAVIGATION RECEIVER ASSEMBLY)

Disconnect the connectors from the navigation receiver assembly and spiral cable sub-assembly.

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SWG - EAU	Always	Below 1 Ω
SWG - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Navigation Receiver Assembly And Spiral Cable Sub-Assembly Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY

INSPECT STEERING PAD SWITCH CABLE

Disconnect the steering pad switch LH and the steering pad switch RH.

Fig 5: Identifying Steering Pad Switch LH And RH Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester connection	Condition	Specified condition
LH-1 - RH-1	Always	Below 1 Ω
LH-2 - RH-2	Always	Below 1 Ω
LH-3 - RH-3	Always	Below 1 Ω
LH-4 - RH-4	Always	Below 1 Ω
LH-5 - RH-5	Always	Below 1 Ω
LH-6 - RH-6	Always	Below 1 Ω
LH-7 - RH-7	Always	Below 1 Ω
LH-8 - RH-8	Always	Below 1 Ω
LH-1 - Body ground	Always	10 kΩ or higher
LH-2 - Body ground	Always	10 kΩ or higher
LH-3 - Body ground	Always	10 kΩ or higher
LH-4 - Body ground	Always	10 kΩ or higher
LH-5 - Body ground	Always	10 kΩ or higher
LH-6 - Body ground	Always	10 kΩ or higher
LH-7 - Body ground	Always	10 kΩ or higher
LH-8 - Body ground	Always	10 kΩ or higher

NG: REPLACE STEERING PAD SWITCH CABLE

OK: REPLACE STEERING PAD SWITCH RH

CHECK HARNESS AND CONNECTOR (BATTERY - NAVIGATION RECEIVER ASSEMBLY)

Disconnect the navigation receiver assembly connector R15.

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

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester connection	Condition	Specified condition
ILL+ - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Fig 6: Identifying Navigation Receiver Assembly Connector R15

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY COMBINATION METER)

Disconnect the navigation receiver assembly and combination meter connectors.

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

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester connection	Condition	Specified condition
ILL- - C10-22	Always	Below 1 Ω
ILL- - Body ground	Always	10 kΩ or higher

Fig 7: Identifying Navigation Receiver Assembly Combination Meter Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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