Rear Window Defogger System Does Not Operate
WINDOW / GLASS: WINDOW DEFOGGER SYSTEM: Rear Window Defogger System does not Operate
- Rear Window Defogger System does not Operate
DESCRIPTION
When the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* Since the window defogger system has functions that use LIN*1 or CAN*2 communication, first confirm that there is no malfunction in the communication system by inspecting the LIN*1 or CAN*2 communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
* *1: w/o Navigation System
* *2: w/ Navigation System
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM (DEFOGGER RELAY [REAR])
(a) Using the Techstream, perform the Active Test Scan Tool Testing and Procedures.
Air Conditioner
OK:
The DEF relay operates normally.
NG -- INSPECT DEF RELAY
OK -- Continue to next step.
2. SYSTEM CHECK
(a) Confirm if the vehicle is equipped with the navigation system.
Result
B -- REPLACE HEATER CONTROL SWITCH BOARD
A -- Continue to next step.
3. REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY
(a) Temporarily replace the display and navigation module display with a new or normally functioning one Removal.
(b) Check the rear defogger function.
OK:
The window defogger function operates normally.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- END (DISPLAY AND NAVIGATION MODULE DISPLAY IS DEFECTIVE)
4. REPLACE HEATER CONTROL SWITCH BOARD
(a) Replace the heater control switch board with a new or normally functioning one Disassembly.
(b) Operate the air conditioning control assembly to check that it functions properly.
OK:
Air conditioning control assembly operates normally.
NG -- REPLACE AIR CONDITIONING CONTROL ASSEMBLY
OK -- END (HEATER CONTROL SWITCH BOARD IS DEFECTIVE)
5. REPLACE AIR CONDITIONING CONTROL ASSEMBLY
(a) Temporarily replace the air conditioning control with a new or normally functioning one Removal.
(b) Check the rear defogger function.
OK:
The window defogger function operates normally.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)
6. INSPECT DEF RELAY
(a) Remove the DEF relay from the engine room relay block, junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE DEF RELAY
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (DEF RELAY - BATTERY)
(a) Remove the DEF relay from the engine room relay block, junction block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - DEF RELAY AND BODY GROUND)
(a) Disconnect the G13 air conditioning amplifier connector.
(b) Remove the DEF relay from the engine room relay block, junction block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - DEF RELAY AND BODY GROUND)
(a) Disconnect the Y2 back door glass (window defogger wire) connectors.
(b) Remove the DEF relay from the engine room relay block, junction block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BACK DOOR GLASS (WINDOW DEFOGGER WIRE) Removal