Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 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 the precautionary notice for the supplemental restraint system (See AIRBAG SYSTEM ).

CHECK ILLUMINATION

Check if the illumination for the radio receiver, steering pad switch, cigarette lighter or others (seat heater switch, hazard switch, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

Result

RESULT CHART

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

B: Go to step 6

C: GO TO LIGHTING SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

D: GO TO METER / GAUGE SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to Next Step

CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE)

Disconnect the spiral cable connector.

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
IL+2 - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Fig 1: Identifying Spiral Cable Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT STEERING PAD SWITCH ASSEMBLY
1. Disconnect the steering pad switch assembly connector.
2. Connect the positive (+) lead to terminal IL+2 and the negative (-) lead to terminal EAU of the steering pad switch assembly connector.
  
  Fig 2: Inspecting Steering Pad Switch Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check if the illumination for the steering pad switch assembly comes on.
  OK: Illumination for the steering pad switch assembly comes on.
NG: REPLACE STEERING PAD SWITCH ASSEMBLY

OK: Go to Next Step

INSPECT SPIRAL CABLE

Disconnect the steering pad switch assembly and spiral cable connectors.

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

Standard resistance

RESISTANCE SPECIFICATION

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
IL+2 - IL+2	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 page shown in the brackets.

HINT:

(See REMOVAL )
(See INSTALLATION )

Fig 3: Identifying Steering Pad Switch And Spiral Cable Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)

Disconnect the connectors from the radio receiver and spiral cable.

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

Standard resistance

RESISTANCE SPECIFICATION

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

Fig 4: Identifying Radio Receiver And Spiral Cable Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE RADIO RECEIVER

CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER)

Disconnect the radio receiver connector E69.

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

Standard voltage

VOLTAGE SPECIFICATION

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

Fig 5: Identifying Radio Receiver Connector E69

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)

Disconnect the radio receiver connector and combination meter connector.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
ILL- - ILL-	Always	Below 1 Ω
ILL- - Body ground	Always	10 kΩ or higher

Fig 6: Identifying Radio Receiver And Combination Meter Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE RADIO RECEIVER