Illumination Circuit: Procedure

1. Check if the illumination for the navigation receiver assembly, steering pad switch assembly, 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 assembly.	A
   Illumination comes on for all components except navigation receiver assembly.	B
   Illumination comes on for all components except navigation receiver assembly and steering pad switch assembly.	C
   No illumination comes on (navigation receiver assembly, glove box, hazard switch, etc.).	D

B → See step   7 

C → See step   9 

D → See step   11 

A: Go to next step 

1. Disconnect the D16 spiral cable connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D16-12 (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: Go to next step 

1. Disconnect the z2 steering pad switch assembly and D16 spiral cable connectors.
   Fig 1: Disconnecting Z2 Steering Pad Switch Assembly & D16 Spiral Cable Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-8 (EAU) - D16-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-5 (IL+2) - D16-12 (IL+2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTE:

   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.

   HINT: 

   • Removal, refer to REMOVAL
   • Installation, refer to INSTALLATION
   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Spiral Cable)
   *b	Steering Pad Switch Assembly Side
   *c	Vehicle Side

NG → See step   12 

OK: Go to next step 

1. Disconnect the E3 navigation receiver assembly connector.
2. Disconnect the D16 spiral cable connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E3-6 (SWG) - D16-4 (EAU)	Always	Below 1 Ω
   E3-6 (SWG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the z2 steering pad switch assembly connector.
2. Connect a positive (+) lead from the battery to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly connector.
   Fig 2: Disconnecting Z2 Steering Pad Switch Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Steering Pad Switch)

   -

   -

3. Check if the illumination for the steering pad switch assembly comes on.

   OK

   Illumination for the steering pad switch assembly comes on.

NG → See step   13 

OK → See step   6 

1. Disconnect the E2 navigation receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E2-2 (ILL+) - Body ground	Light control switch in the tail or head position	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

1. Disconnect the E2 navigation receiver assembly connector.
2. Disconnect the E1 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E2-12 (ILL-) - E1-30 (ILL-)	Always	Below 1 Ω
   E2-12 (ILL-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10