Illumination Circuit
AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (w/ Multi-display without DVD Player): Illumination Circuit; 2013 MY Corolla [07/2012 -]
- Illumination Circuit
DESCRIPTION
Power is supplied to the radio and display receiver assembly and steering pad switch illumination when the light control switch is in the tail or head position.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* 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 Service Precautions.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. CHECK ILLUMINATION
(a) Check if the illumination for the radio and display receiver assembly, steering pad switch assembly*1 or steering pad switch LH*2, 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:
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
B -- CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)
C -- GO TO METER / GAUGE SYSTEM How to Proceed With Troubleshooting
D -- GO TO LIGHTING SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)
(a) Disconnect the E6 spiral cable sub-assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT STEERING PAD SWITCH
(a) Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector (for Type A).
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
(b) Connect a battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly*1 or steering pad switch LH*2 connector.
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
(c) Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector (for Type B).
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
(d) Connect a battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly*1 or steering pad switch LH*2 connector.
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
(e) Check if the illumination for the steering pad switch assembly*1 or steering pad switch LH*2 comes on.
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
OK:
Illumination for the steering pad switch comes on.
Text in Illustration
NG -- REPLACE STEERING PAD SWITCH Removal
OK -- Continue to next step.
4. INSPECT SPIRAL CABLE SUB-ASSEMBLY
(a) Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector.
*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH
(b) Disconnect the E6 spiral cable sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) After setting the spiral cable sub-assembly to the center position, rotate the spiral cable sub-assembly 2.5 times clockwise. Then while rotating the spiral cable sub-assembly 5 times counterclockwise, measure the resistance as shown in the table below.
Standard Resistance:
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. Refer to the pages shown in the brackets.
* As the spiral cable sub-assembly may break, do not rotate the spiral cable sub-assembly more than the specified amount.
HINT
* Removal Removal
* Installation Installation
Text in Illustration
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)
(a) Disconnect the E6 spiral cable sub-assembly connector.
(b) Disconnect the E129 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
6. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)
(a) Disconnect the E126 radio and display receiver assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)
(a) Disconnect the E127 radio and display receiver assembly connector.
(b) Disconnect the E46 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table