Navigation System 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 (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)

DESCRIPTION

WIRING DIAGRAM

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 the precautionary notice for the SRS (HILUX_TGN26 RM000000KT10ITX.html).

1. Check if the illumination for the navigation receiver assembly, steering pad switch assembly, glove box or other parts (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 navigation receiver assembly.	B
   No illumination comes on (navigation receiver assembly, hazard switch, glove box, etc.).	C

1. Disconnect the G12 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
   G12-12 (IL+2) - Body ground	Light control switch TAIL or HEAD	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 (HILUX_TGN26 RM0000033RT0AIX.html).
   

   
   
   
   

2. Connect the positive (+) lead of the battery to terminal z3-5 (IL+2) and the negative (-) lead to terminal z3-8 (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.
   

1. Remove the spiral cable sub-assembly (HILUX_TGN26 RM0000010B201AX.html).
   

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

   Standard Resistance:

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

   Text in Illustration

   *a	Steering Pad Switch Side
   *b	Vehicle Side

   CAUTION:

   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 Precaution for the SRS (HILUX_TGN26 RM000000KT10ITX.html).

1. Disconnect the G152 navigation receiver assembly connector.
   

2. Disconnect the G12 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
   G152-23 (SWG) - G12-4 (EAU)	Always	Below 1 Ω
   G152-23 (SWG) - Body ground	Always	10 kΩ or higher

1. Disconnect the G105 navigation receiver assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G105-7 (GND) - 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
   G105-10 (ILL+) - Body ground	Light control switch TAIL or HEAD	11 to 14 V