Window Defogger System (For Automatic Air Conditioning System) Rear Window Defogger System Does Not Operate

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE)

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

CONFIRM REAR WINDOW DEFOGGER OPERATION

CHECK FUSES (DEF, ECU-IG NO. 2)

CHECK HARNESS AND CONNECTOR (IG1 RELAY POWER SOURCE)

CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER SYSTEM POWER SOURCE)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSEMBLY - BATTERY)

CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - INSTRUMENT PANEL JUNCTION BLOCK)

CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BATTERY)

CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - BODY GROUND)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
   

5. Select the Active Test, use the Techstream to issue a control command, and then check the window defogger operation.
   
   

   Air Conditioner

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay	Turns rear window defogger	OFF/ON	-

6. Check that operation sound of the DEF relay is heard.
   

   Result:

   Result	Proceed to
   The window defogger system operates normally when operating it through the Techstream.	A
   The window defogger system does not operate normally when operating it through the Techstream and relay operating sound is not heard.	B
   The window defogger system does not operate normally when operating it through the Techstream and relay operating sound is heard.	C

1. Disconnect the E30 air conditioning amplifier and E16 air conditioning control connectors.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E30-37 (LIN1) - E16-3 (LIN1)	Always	Below 1 Ω
   E30-37 (LIN1) - Body ground	Always	10 kΩ or higher

1. Replace the air conditioning control assembly (COROLLA_ZRE142 RM000002XM202GX.html).
   

1. Turn the ignition switch to ON, press the defogger switch, and check that the window defogger operates.
   

   OK:

   Window defogger system operates normally
   

1. Remove the DEF and ECU-IG No. 2 fuses from the instrument panel junction block.
   

2. Measure the resistance of the fuses.
   

   Standard Resistance:

   Item	Condition	Specified Condition
   DEF fuse	Always	Below 1 Ω
   ECU-IG No. 2 fuse	Always	Below 1 Ω

1. Disconnect the 2F instrument panel junction block connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   2F-3 - Body ground	Ignition switch ON	11 to 14 V

   Result:

   Result	Proceed to
   OK	A
   NG (w/ Smart Key System)	B
   NG (w/o Smart Key System)	C

1. Disconnect the 2G instrument panel junction block connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   2G-1 - Body ground	Ignition switch ON	11 to 14 V

1. Disconnect the E30 air conditioning amplifier and 2Q instrument panel junction block connectors.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E30-38 (RDFG) - 2Q-12	Always	Below 1 Ω
   E30-38 (RDFG) - Body ground	Always	10 kΩ or higher

1. Reconnect the 2Q instrument panel junction block connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E30-38 (RDFG) - Body ground	Ignition switch ON	11 to 14 V

1. Disconnect the 2F instrument panel junction block and L46 rear window defogger wire connectors.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   L46-1 - 2F-2	Always	Below 1 Ω
   L46-1 - Body ground	Always	10 kΩ or higher

1. Reconnect the 2F instrument panel junction block connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   L46-1 - Body ground	Ignition switch ON, Rear window defogger switch on	11 to 14 V

1. Disconnect the P1 rear window defogger wire connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   P1-1 - Body ground	Always	Below 1 Ω