Navigation System (For Radio And Display Type) Illumination Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ILLUMINATION

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

INSPECT STEERING PAD SWITCH ASSEMBLY

INSPECT SPIRAL CABLE SUB-ASSEMBLY

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

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT SWITCH CONTROL ECU - SPIRAL CABLE SUB-ASSEMBLY AND BODY GROUND)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CAUTION:

The vehicle is equipped with a Supplemental Restraint System (SRS) 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 (LandCruiser RM000000KT10NVX.html).

NOTICE:

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

1. Check if the illumination for the radio and display receiver assembly, steering pad switch assembly, heater control switch or others (hazard switch, transmission control switch, etc.) comes 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 assembly.	A
   Illumination comes on for all components except radio and display receiver assembly.	B
   Illumination comes on for all components except steering pad switch assembly and radio and display receiver assembly.	C
   No illumination comes on (radio and display receiver assembly, hazard switch, heater control switch, etc.).	D

1. Disconnect the spiral cable sub-assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   G40-12 (IL+2) - Body ground	Light control switch tail or head position	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

1. Remove the steering pad switch assembly (LandCruiser RM0000039SA01YX.html).
   

2. Inspect the steering pad switch assembly (LandCruiser RM000003C4V01IX.html).
   

1. Remove the spiral cable sub-assembly (LandCruiser RM000002O8X02DX.html).
   

2. Inspect the spiral cable sub-assembly (LandCruiser RM000002O8V03FX.html).
   

1. Disconnect the H51 radio and display receiver assembly connector.
   

2. Disconnect the G40 spiral cable sub-assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H51-23 (SWG) - G40-4 (EAU)	Always	Below 1 Ω
   H51-23 (SWG) - Body ground	Always	10 kΩ or higher

1. Disconnect the radio and display receiver assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H49-7 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   H49-10 (ILL+) - Body ground	Light control switch in the tail or head position	11 to 14 V

1. Disconnect the G40 spiral cable sub-assembly connector.
   

2. Disconnect the G76*1 or G163*2 driving support switch control ECU connector.
   

   1. *1: for Manual Transmission
      
   2. *2: for Automatic Transmission
      

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

   Standard Resistance:

   for Manual Transmission

   Tester Connection	Condition	Specified Condition
   G40-10 (GND1) - G76-4 (SWI2)	Always	Below 1 Ω
   G76-16 (GND) - Body ground	Always	Below 1 Ω
   G76-4 (SWI2) - Body ground	Always	10 kΩ or higher

   for Automatic Transmission

   Tester Connection	Condition	Specified Condition
   G40-10 (GND1) - G163-14 (SWI2)	Always	Below 1 Ω
   G163-7 (GND) - Body ground	Always	Below 1 Ω
   G163-14 (SWI2) - Body ground	Always	10 kΩ or higher