Rear Window Defogger System Does Not Operate
WINDOW / GLASS: WINDOW DEFOGGER SYSTEM (for Automatic Air Conditioning System): Rear Window Defogger System does not Operate
- Rear Window Defogger System does not Operate
DESCRIPTION
When the rear window defogger switch, which is built into the air conditioning control assembly, is operated, the operation signals are transmitted to the air conditioning amplifier assembly through LIN. When the air conditioning amplifier assembly receives the signals, it turns on the DEF relay to operate the rear window defogger.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Select the Active Test, use the Techstream to issue a control command, and then check the window defogger operation.
Air Conditioner
Air Conditioner:
(f) Check that operation sound of the DEF relay is heard.
Result:
C -- CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - INSTRUMENT PANEL JUNCTION BLOCK)
B -- CHECK FUSES (DEF, ECU-IG NO. 2)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE)
(a) Disconnect the E30 air conditioning amplifier and E16 air conditioning control connectors.
(b) 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.
3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY
(a) Replace the air conditioning control assembly Removal.
NEXT -- Continue to next step.
4. CONFIRM REAR WINDOW DEFOGGER OPERATION
(a) Turn the ignition switch to ON, press the defogger switch, and check that the window defogger operates.
OK:
Window defogger system operates normally
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- END
5. CHECK FUSES (DEF, ECU-IG NO. 2)
(a) Remove the DEF and ECU-IG No. 2 fuses from the instrument panel junction block.
(b) Measure the resistance of the fuses.
Standard Resistance:
NG -- REPLACE FUSES
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (IG1 RELAY POWER SOURCE)
(a) Disconnect the 2F instrument panel junction block connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Result:
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- GO TO SMART KEY SYSTEM Power Source Mode Does Not Change
A -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER SYSTEM POWER SOURCE)
(a) Disconnect the 2G instrument panel junction block 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.
8. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)
(a) Disconnect the E30 air conditioning amplifier and 2Q instrument panel junction block connectors.
(b) 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. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSEMBLY - BATTERY)
(a) Reconnect the 2Q instrument panel junction block connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
10. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - INSTRUMENT PANEL JUNCTION BLOCK)
(a) Disconnect the 2F instrument panel junction block and L46 rear window defogger wire connectors.
(b) 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.
11. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BATTERY)
(a) Reconnect the 2F instrument panel junction block connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BODY GROUND)
(a) Disconnect the P1 rear window defogger wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE Window Defogger System (for Automatic Air Conditioning System)