Rear Window Defogger System does not Operate: Procedure

1. Activate the rear defogger system and check the symptoms.

   Result

   Result	Proceed to
   Both back window defoggers do not warm up.	A
   The back door glass defogger does not warm up.	B
   The back window fix glass defogger does not warm up.	C

B → See step   10 

C → See step   11 

A: Go to next step 

1. Check the air conditioning system.

   HINT: 

   Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through the same communication line.

   OK

   The air conditioning system operates normally.

NG → See step   14 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
5. Perform the Active Test according to the display on the Techstream.
   AIR CONDITIONER (AIR CONDITIONING AMPLIFIER ASSEMBLY)
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Rear window defogger	OFF or ON	Operate with power switch on (IG)

   OK

   The rear window defogger system operates normally.

NG → See step   5 

OK: Go to next step 

1. Temporarily replace the air conditioning amplifier assembly with a new or known good one. Refer to REMOVAL .
2. Check that the rear window defogger system operates normally.

   OK

   The rear window defogger system operates normally.

NG → See step   15 

OK → END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE) 

1. Disconnect the 1G and 1H No. 1 integration relay connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1H-7 (BATT) - Body ground	Power switch off	11 to 14 V
   1G-14 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
   1G-14 (IG1) - Body ground	Power switch off	Below 1 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1G-22 (GND1) - Body ground	Always	Below 1 Ω
   1H-3 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the L113 air conditioning amplifier assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L113-20 (RDFG) - 1G-15 (DEF)	Always	Below 1 Ω
   1G-15 (DEF) - Body ground	Always	10 kΩ or higher
   L113-14 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the 1G and 1H No. 1 integration relay connectors.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L113-20 (RDFG) - Body ground	Power switch on (IG)	11 to 14 V

NG → See step   16 

OK: Go to next step 

1. Reconnect the L113 air conditioning amplifier assembly connector.
   Fig 1: Checking Air Conditioning Amplifier Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L113-20 (RDFG) - L113-14 (GND)	Power switch on (IG), rear window defogger switch off	11 to 14 V
   L113-20 (RDFG) - L113-14 (GND)	Power switch on (IG), rear window defogger switch on	Below 2 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (to Air Conditioning Amplifier Assembly)

NG → See step   13 

OK: Go to next step 

1. Disconnect the V1 rear window defogger wire (back door glass) connector.
2. Disconnect the V2 rear window defogger wire (back window fix glass) connector.
3. Disconnect the 1I No. 1 integration relay connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1I-1 (RDEF) - Body ground	Always	10 kΩ or higher
   1I-1 (RDEF) - V1-1	Always	Below 1 Ω
   1I-1 (RDEF) - V2-1	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   17 

1. Disconnect the V1 and V10 rear window defogger wire (back door glass) connectors.
2. Disconnect the 1l No. 1 integration relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1l-1 (RDEF) - V1-1	Always	Below 1 Ω
   V10-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12 

1. Disconnect the V2 and V8 rear window defogger wire (back window fix glass) connectors.
2. Disconnect the 1l No. 1 integration relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1l-1 (RDEF) - V2-1	Always	Below 1 Ω
   V8-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   18