Rear Window Defogger System does not Operate [10/2022 - 11/2023]: Procedure

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 via the same communication line.

   OK

   The air conditioning system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO AIR CONDITIONING SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 11/2023]

Result: 

OK 

See step  2

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Air Conditioner > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Rear window defogger wire (Back door glass)	OFF or ON	-

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Defogger Relay (Rear)

   OK

   The window defogger system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Replace the rear window defogger switch (air conditioning control assembly) with a new or known good one.

   Refer to REMOVAL [10/2022 - ]

2. Check that the window defogger system operates normally.

   Refer to OPERATION CHECK [12/2019 - 11/2023] 

   OK

   The window defogger system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (REAR WINDOW DEFOGGER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE) 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

Refer to REMOVAL [10/2022 - 11/2023]

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

   Standard Resistance

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DEF RELAY 

Result: 

OK 

See step  5

1. Remove the DEF relay from the No. 1 engine room relay block and No. 1 junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEF Relay Holder

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   DEF relay holder terminal 2 - Body ground	Ignition switch ON	11 to 14 V
   DEF relay holder terminal 5 - Body ground	Ignition switch off*1 Always*2	11 to 14 V

   1. *1: for HV Model
   2. *2: for Gasoline Model

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the DEF relay from the No. 1 engine room relay block and No. 1 junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEF Relay Holder

2. Disconnect the H63 air conditioning amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DEF relay holder terminal 1 - H63-18 (RDFG)	Always	Below 1 Ω
   DEF relay holder terminal 1 or H63-18 (RDFG) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Remove the DEF relay from the No. 1 engine room relay block and No. 1 junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEF Relay Holder

2. Disconnect the W2 rear window defogger wire (back door glass) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DEF relay holder terminal 3 - W2-1	Always	Below 1 Ω
   DEF relay holder terminal 3 or W2-1 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Disconnect the W3 rear window defogger wire (back door glass) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W3-1 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Reconnect the H63 air conditioning amplifier assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Reinstall the DEF relay.
3. Remove the air conditioning amplifier assembly with its connectors still connected.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H63-18 (RDFG) - H62-17 (GND)	Ignition switch ON, rear window defogger switch on	Below 1 V
   H63-18 (RDFG) - H62-17 (GND)	Ignition switch ON, rear window defogger switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE BACK DOOR GLASS 

Refer to REPAIR [12/2019 - ]

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

Refer to REMOVAL [10/2022 - 11/2023]