AUDIO AND VISUAL SYSTEM > Illumination Circuit

for Preparation Click here


DESCRIPTION

Power is supplied to the illumination circuit for the radio receiver assembly and steering pad switch LH when the light control switch is in the TAIL or HEAD position.

WIRING DIAGRAM


E176079E01


INSPECTION PROCEDURE

CAUTION:
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 Precaution for the supplemental restraint system (Click here).

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK ILLUMINATION

  1. Check if the illumination for the radio receiver assembly, steering pad switch LH or other parts (heater control switch, defogger switch, etc.) come on when the light control switch is turned to the HEAD or TAIL position.
    Result 
    Result
    		Proceed to
    Illumination comes on for all components except steering pad switch.
    		A
    Illumination comes on for all components except radio receiver.
    		B
    Illumination comes on for all components except steering pad switch and radio receiver.
    No illumination (radio receiver, heater control switch, defogger switch, etc.) comes on.
    		C



B
Go to step 5

C
GO TO LIGHTING SYSTEM (Click here)
A


2.CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER - BATTERY AND BODY GROUND)


    E138073E05

  1. Disconnect the D19 spiral cable sub-assembly connector.

  1. Disconnect the D63 radio receiver assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D19-4 (EAU) - D63-6 (SWG)
    		Always
    		Below 1 Ω
    D19-4 (EAU) - Body ground
    		Always
    		10 kΩ or higher

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D19-12 (IL+2) - Body ground
    		Light control switch OFF
    		Below 1 V
    Light control switch TAIL or HEAD
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Radio Receiver Assembly)
    *2
    		Front view of wire harness connector
    (to Spiral Cable Sub-Assembly)

  1. Reconnect the spiral cable sub-assembly connector.

  1. Reconnect the radio receiver assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT STEERING PAD SWITCH LH

E176080E01


Text in Illustration 
*1
Steering Pad Switch LH

  1. Disconnect the V1 steering pad switch LH connector.

  1. Connect the positive (+) lead to terminal 5 (IL+2) and the negative (-) lead to terminal 8 (EAU) of the steering pad switch LH connector.

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

    OK:
    Illumination for the steering pad switch LH comes on.

  1. Reconnect the steering pad switch LH connector.



NG
REPLACE STEERING PAD SWITCH LH (Click here)
OK


4.INSPECT SPIRAL CABLE SUB-ASSEMBLY


    E170601E05

  1. Disconnect the V1 and D19 spiral cable sub-assembly connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    V1-5 (IL+2) - D19-12 (IL+2)
    		Spiral cable is turned 2.5 rotations counterclockwise
    		Below 1 Ω
    Spiral cable is centered
    Spiral cable is turned 2.5 rotations clockwise
    V1-8 (EAU) - D19-4 (EAU)
    		Spiral cable is turned 2.5 rotations counterclockwise
    Spiral cable is centered
    Spiral cable is turned 2.5 rotations clockwise

    Text in Illustration 
    *1
    		Component without harness connected
    (Spiral Cable Sub-Assembly)
    *2
    		Steering Pad Switch Side
    *3
    		Vehicle Side

    CAUTION:
    The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Be sure to read Precaution for the supplemental restraint system (Click here).

  1. Reconnect the spiral cable sub-assembly connectors.



NG
REPLACE SPIRAL CABLE SUB-ASSEMBLY (Click here)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

5.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY AND BODY GROUND)


    E176041E03

  1. Disconnect the D61 radio receiver assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D61-10 (ILL+) - Body ground
    		Light control switch
    TAIL or HEAD
    		11 to 14 V
    Light control switch OFF
    		Below 1 V

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D61-7 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Radio Receiver Assembly)

  1. Reconnect the radio receiver assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)