Illumination Circuit

DESCRIPTION

Power is supplied to the multi-display and steering pad switch assembly illumination when the light control switch is in the TAIL or HEAD position.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

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 (Click here).

1. CHECK ILLUMINATION

1. Check if the illumination for the multi-display, steering pad switch assembly, 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:

   Condition	Proceed to
   Illumination comes on for all components except steering pad switch.	A
   Illumination comes on for all components except multi-display.	B
   No illumination comes on (radio receiver, hazard switch cigarette lighter, etc.)	C
   Illumination comes on only for cigarette lighter and steering pad switch.	D

B	Go to step 6
C	GO TO LIGHTING SYSTEM
D	GO TO COMBINATION METER SYSTEM

A

2. CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE)

1. Disconnect the spiral cable connector.

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

   Standard voltage:

   Tester connection	Condition	Specified condition
   IL+2 - Body ground	Light control SW TAIL or HEAD	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3. CHECK 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.

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

4. CHECK SPIRAL CABLE

1. Disconnect the steering pad switch assembly and spiral cable connectors.

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

   Standard resistance:

   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

   NOTICE:

   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 (Click here).

NG	REPLACE SPIRAL CABLE

OK

5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)

1. Disconnect the radio receiver and spiral cable connectors.

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

   Standard resistance:

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

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE RADIO RECEIVER

6. CHECK HARNESS AND CONNECTOR (BATTERY - MULTI-DISPLAY)

1. Disconnect the multi-display connector J50.

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

   Standard voltage:

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

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMBINATION METER)

1. Disconnect the multi-display and combination meter connectors.

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

   Standard resistance:

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

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE