Illumination Circuit: Procedure

1. Check if the illumination for the multi-media module receiver assembly, accessory meter assembly, steering pad switch assembly or others (hazard 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 accessory meter assembly.	B
   Illumination comes on for all components except multi-media module receiver assembly.	C
   No illumination comes on (multi-media module receiver assembly, accessory meter assembly, steering pad switch, hazard switch, heater control switch, etc.).	D

B → See step   5 

C → See step   6 

D → See step   8 

A: Go to next step 

1. Replace the steering pad switch assembly with a new or normally functioning one. Refer to REMOVAL [09/2012 - ] .
2. Check if the same malfunction recurs.
   RESULT
   
   

   Result	Proceed to
   Malfunction does not recur (returns to normal).	A
   Malfunction recurs.	B

B → See step   3 

A → END (STEERING PAD SWITCH ASSEMBLY IS DEFECTIVE) 

1. Remove the spiral cable sub-assembly. Refer to REMOVAL [09/2012 - ] .
2. Inspect the spiral cable sub-assembly. Refer to INSPECTION [09/2012 - ] .

NG → See step   9 

OK: Go to next step 

1. Disconnect the L134 spiral cable sub-assembly connector.
2. Disconnect the L10 No. 1 meter ECU sub-assembly connector.
3. Disconnect the PA passenger side junction block assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L134-14 (ILL-) - L10-16 (ILL-)	Always	Below 1 Ω
   L134-7 (+B) - PA-35 (CUTD)	Always	Below 1 Ω
   L134-14 (ILL-) - Body ground	Always	10 kΩ or higher
   L134-7 (+B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7 

1. Disconnect the L145 accessory meter assembly connector.

   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
   L145-13 (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
   L145-2 (ILL+) - Body ground	Light control switch in the tail or head position	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Accessory Meter Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7 

1. Disconnect the L146 multi-media module receiver assembly connector.
2. Disconnect the L10 No. 1 meter ECU sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L146-13 (ILL-) - L10-16 (ILL-)	Always	Below 1 Ω
   L146-13 (ILL-) - Body ground	Always	10 kΩ or higher

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L146-14 (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   7