Rear Window Defogger System does not Operate: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
5. Check the value(s) by referring to the table below, and then check the window defogger operation. Refer to ON-VEHICLE INSPECTION .

   Air Conditioner

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

   OK

   Rear window defogger normally operates.

NG → See step   15 

OK: Go to next step 

1. Use the Techstream to check if the multiplex communication system is functioning normally. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   Multiplex communication DTC is not output (w/o navigation system)	A
   Multiplex communication DTC is output	B
   Multiplex communication DTC is not output (w/ navigation system)	C

C → See step   10 

B → See step   23 

A: Go to next step 

1. Use the Techstream to check if the audio and visual system is functioning normally. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   Audio and visual system DTC is output	A
   Audio and visual system DTC is not output	B

B → See step   24 

A: Go to next step 

1. Replace the integration control and panel assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates. Refer to ON-VEHICLE INSPECTION .

   OK

   Rear window defogger normally operates.

NG → See step   6 

OK → END 

1. Replace the radio receiver assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates. Refer to ON-VEHICLE INSPECTION .

   OK

   Rear window defogger normally operates.

NG → See step   8 

OK → END 

1. Replace the gateway ECU. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates. Refer to ON-VEHICLE INSPECTION .

   OK

   Rear window defogger normally operates.

NG → See step   25 

OK → END 

1. Use the Techstream to check if the navigation system is functioning normally. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   Navigation system DTC is not output	A
   Navigation system DTC is output	B

B → See step   26 

A: Go to next step 

1. Replace the multi-display assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates. Refer to ON-VEHICLE INSPECTION .

   OK

   Rear window defogger normally operates.

NG → See step   13 

OK → END 

1. Replace the gateway ECU. Refer to REMOVAL .

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates. Refer to ON-VEHICLE INSPECTION .

   OK

   Rear window defogger normally operates.

NG → See step   27 

OK → END 

1. Disconnect the DEFOG relay from engine room No. 1 relay block and junction block.
   Fig 1: Identifying DEFOG Relay

   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
   Engine room No. 1 relay block and junction block DEFOG relay terminal 1 - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR, OR LH-IG FUSE 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying DEFOG Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Engine room No. 1 relay block and junction block DEFOG relay terminal 5 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR, OR DEFOG FUSE 

OK: Go to next step 

1. Measure the resistance of the DEFOG relay.
   Fig 3: Defogger Relay Circuit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Condition	Condition	Specified Condition
   3 - 4	When battery voltage is not applied between terminals	Below 1 Ω
   3 - 5	When battery voltage is not applied between terminals	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE DEFOG RELAY 

OK: Go to next step 

1. Reconnect the DEFOG relay.
   Fig 4: Identifying J58 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the J58 connector from the A/C amplifier assembly.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J58-3 (RDFG) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the J58 connector to the A/C amplifier assembly.
   Fig 5: Identifying J58 Connector

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J58-3 (RDFG) - Body ground	Push the window defogger switch on	Below 1 V

NG → See step   28 

OK: Go to next step 

1. Disconnect the DEFOG relay and defogger wire connectors.
   Fig 6: Identifying DEFOG Relay And Defogger Wire Connectors

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Engine room No. 1 relay block and junction block DEFOG relay terminal 3 - Q21-1	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the noise filter connectors.
   Fig 7: Identifying Noise Filter

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-1 - B-1	Always	Below 1 Ω

NG → REPLACE NOISE FILTER 

OK: Go to next step 

1. Disconnect the rear defogger wire connector.
   Fig 8: Identifying Rear Defogger Wire Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P19-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   29