Audio And Visual System (W/O Multi-Display) Illumination Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ILLUMINATION

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

INSPECT STEERING PAD SWITCH LH

INSPECT SPIRAL CABLE SUB-ASSEMBLY

CHECK HARNESS AND CONNECTOR

CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. 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 precaution for Supplemental Restraint System (COROLLA_ZRE142 RM000000KT10H0X.html).
   
2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   

1. Check if the illumination for the radio receiver assembly, steering pad switch LH, 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:

   
   

   Condition	Proceed to
   Illumination comes on for all components except steering pad switch LH.	A
   Illumination comes on for all components except radio receiver assembly.	B
   No illumination comes on (radio receiver assembly, hazard switch, heater control switch, etc.).	C

1. Disconnect the E6 spiral cable sub-assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E6-12 (IL+2) - Body ground	Light control switch in the tail or head position	11 to 14 V

1. Disconnect the steering pad switch LH connector.
   

2. Connect a battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch LH connector (w/o Front Spoiler).
   

   
   
   
   

3. Connect a battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch LH connector (w/ Front Spoiler).
   

   
   
   
   

4. Check if the illumination for the steering pad switch LH comes on.
   

   OK:

   Illumination for the steering pad switch LH comes on.
   

   
   

   Text in Illustration

   *A	for Type A	*B	for Type B
   *a	Component without harness connected (Steering Pad Switch LH)	-	-

1. Disconnect the Y1 steering pad switch LH connector.
   

2. Disconnect the E6 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
   Y1-8 (EAU) - E6-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   Y1-5 (IL+2) - E6-12 (IL+2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTICE:

   The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Be sure to read the pages shown in the brackets.

   HINT:

   1. Removal (COROLLA_ZRE142 RM000000UWD09PX.html)
      
   2. Installation (COROLLA_ZRE142 RM000000UWA09QX.html)
      

   Text in Illustration

   *a	Component without harness connected (Spiral Cable Sub-assembly)
   *b	Steering Pad Switch LH Side
   *c	Vehicle Side

1. Disconnect the E114 radio receiver assembly connector (for 6 speakers (w/ USB audio system)).
   

2. Disconnect the E26 radio receiver assembly connector (for 6 speakers (w/o USB audio system)).
   

3. Disconnect the E6 spiral cable sub-assembly connector.
   

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

   Standard Resistance:

   for 6 Speakers (w/ USB Audio System)

   Tester Connection	Condition	Specified Condition
   E114-23 (SWG) - E6-4 (EAU)	Always	Below 1 Ω
   E114-23 (SWG) - Body ground	Always	10 kΩ or higher

   for 6 Speakers (w/o USB Audio System)

   Tester Connection	Condition	Specified Condition
   E26-6 (SWG) - E6-4 (EAU)	Always	Below 1 Ω
   E26-6 (SWG) - Body ground	Always	10 kΩ or higher

1. Disconnect the E1 radio receiver assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E1-10 (ILL+) - Body ground	Light control switch in the tail or head position	11 to 14 V

1. Disconnect the E2 radio receiver assembly connector.
   

2. Disconnect the E46 combination meter assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E2-5 (ILL-) - E46-29 (ILL-)	Always	Below 1 Ω
   E2-5 (ILL-) - Body ground	Always	10 kΩ or higher