NAVIGATION SYSTEM (for HDD) > Illumination Circuit

for Preparation Click here


DESCRIPTION

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

WIRING DIAGRAM


E223975E01


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuse for circuits related to this system before performing the following inspection procedure.
  2. The vehicle is equipped with a Supplemental Restraint System (SRS). Before servicing (including removal or installation of parts), be sure to read Precaution for Supplemental Restraint System (Click here).

1.CHECK ILLUMINATION

  1. Check if the illumination for the steering pad switch assembly, multi-display switch, glove box or others (hazard switch, etc.) comes on when the light control switch is turned to the tail or head position.

    Result:

    Result
    		Proceed to
    Illumination comes on for all components except steering pad switch.
    		A
    Illumination comes on for all components except multi-display switch.
    		B
    No illumination comes on (steering pad switch assembly, multi-display switch, glove box, hazard switch, etc.).
    		C



B
Go to step 7

C
GO TO LIGHTING SYSTEM (Click here)
A


2.CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

  1. Disconnect the H30 spiral with sensor cable sub-assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H30-13 (IL+2) - Body ground
    		Light control switch in the tail or head position
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    E210267E05

  1. Disconnect the z4 steering pad switch assembly and H30 spiral with sensor cable sub-assembly connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z4-8 (EAU) - H30-3 (EAU)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z4-5 (IL+2) - H30-13 (IL+2)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z4-3 (-DP) - H30-11 (-DP)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right

  1. After setting the spiral with sensor cable sub-assembly to the center position, rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then while rotating the spiral with sensor cable as shown in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z4-8 (EAU) - H30-3 (EAU)
    		Always
    		Below 1 Ω
    z4-5 (IL+2) - H30-13 (IL+2)
    		Always
    		Below 1 Ω
    z4-3 (-DP) - H30-11 (-DP)
    		Always
    		Below 1 Ω

    NOTICE:
    1. The spiral with sensor cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
    2. As the spiral with sensor cable may break, do not rotate the spiral with sensor cable sub-assembly more than the specified amount.

    HINT:
    1. Removal (Click here)
    2. Installation (Click here)

Text in Illustration 
*a
Component without harness connected
(Spiral with Sensor Cable Sub-assembly)
*b
Steering Pad Switch Assembly Side
*c
Vehicle Side


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


4.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H60 display and navigation module display connector.

  1. Disconnect the H30 spiral with sensor cable sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-23 (SWG) - H30-3 (EAU)
    		Always
    		Below 1 Ω
    H30-11 (-DP) - Body ground
    		Always
    		Below 1 Ω
    H60-23 (SWG) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT NAVIGATION COMPUTER SUB-ASSEMBLY


    E176633E22

  1. Disconnect the H60 navigation computer sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-10 (GND1) - H60-23 (SWG)
    		Always
    		Below 1 Ω

Text in Illustration 
*a
Component without harness connected
(Navigation Computer Sub-assembly)


NG
REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY (Click here)
OK


6.INSPECT STEERING PAD SWITCH ASSEMBLY

  1. Disconnect the z4 steering pad switch assembly connector.



  1. Check that the steering pad switch assembly illuminates according to the table below.


    E222754E01


    OK:

    Connection
    		Specified Condition
    Auxiliary battery positive (+) → z4-5 (IL+2)
    Auxiliary battery negative (-) → z4-8 (EAU)
    		Switches of steering pad switch LH side illuminates.
    Auxiliary battery positive (+) → z4-5 (IL+2)
    Auxiliary battery negative (-) → z4-3 (-DP)
    		Switches of steering pad switch RH side illuminates.


    Text in Illustration 
    *a
    		Component without harness connected
    (Steering Pad Switch Assembly)
    		-
    		-



NG
REPLACE STEERING PAD SWITCH ASSEMBLY (Click here)
OK

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

7.INSPECT MULTI-DISPLAY SWITCH (MULTI-DISPLAY SWITCH ILLUMINATION)


    E210271E02

  1. Disconnect the H89 multi-display switch connector.

  1. Connect a positive (+) lead to terminal ILL+ and a negative (-) lead from the auxiliary battery to terminal ILL- of the multi-display switch connector.

  1. Check that the multi-display switch illumination comes on.

    OK:
    Multi-display switch illumination comes on.

Text in Illustration 
*a
Component without harness connected
(Multi-display Switch)


NG
REPLACE MULTI-DISPLAY SWITCH (Click here)
OK


8.CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

  1. Disconnect the H89 multi-display switch connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H89-4 (ILL+) - Body ground
    		Light control switch in the tail or head position
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H89 multi-display switch connector.

  1. Disconnect the H19 combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H89-14 (ILL-) - H19-11 (ILL-)
    		Always
    		Below 1 Ω
    H89-14 (ILL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO METER / GAUGE SYSTEM (Click here)