Windshield Deicer does not Operate [10/2022 - 11/2023]: Procedure

1. Check that the air conditioning system.

   HINT: 

   Both the windshield deicer 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO AIR CONDITIONING SYSTEM 

For HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 11/2023]

For Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 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
   Deicer Relay (Front)	Windshield deicer wire (windshield glass)	OFF or ON	-

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Deicer Relay (Front)

   OK

   The windshield deicer system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Replace the air conditioning amplifier assembly with a new or known good one.

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

2. Check that the windshield deicer system operates normally.

   OK

   The windshield deicer system operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE AIR CONDITIONING CONTROL ASSEMBLY 

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

   Standard Resistance

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DEICER RELAY 

Result: 

OK 

See step  5

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEICER Relay Holder

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   DEICER relay holder terminal 2 - Body ground	Ignition switch ON	11 to 14 V
   DEICER relay holder terminal 3 - 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. Disconnect the H62 air conditioning amplifier assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEICER Relay Holder

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DEICER relay holder terminal 1 - H62-22 (FDEF)	Always	Below 1 Ω
   DEICER relay holder terminal 1 or H62-22 (FDEF) - Body ground	Always	10 kΩ higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Connect the H62 air conditioning amplifier assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H62-22 (FDEF) - H62-17 (GND)	Ignition switch ON, Front wiper deicer switch on	Below 1 V
   H62-22 (FDEF) - H62-17 (GND)	Ignition switch ON, Front wiper deicer switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

Result: 

OK 

See step  8

1. Disconnect A60 windshield deicer wire (windshield glass) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	DEICER Relay Holder

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DEICER relay holder terminal 5 - A60-1 (B)	Always	Below 1 Ω
   DEICER relay holder terminal 5 - A60-3 (B2)	Always	Below 1 Ω
   A60-1 (B) - Body ground	Always	10 kΩ higher
   A60-3 (B2) - Body ground	Always	10 kΩ higher
   DEICER relay holder terminal 5 - Body ground	Always	10 kΩ higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A60-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE WINDSHIELD DEICER WIRE (WINDSHIELD GLASS). Refer to  REMOVAL [10/2021 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR