Windshield Deicer does not Operate: Procedure

1. Check the air conditioning system.

   OK

   The air conditioning system operates normally.

NG → see step   11 

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
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Deicer Relay (Front)	Windshield deicer	OFF or ON	-

   OK

   The windshield deicer operates normally.

NG → see step   4 

OK: Go to next step 

1. Replace the multi-display. Refer to REMOVAL for models with Navigation System.efer to REMOVAL for models without Navigation System).
2. Press the windshield deicer switch.
3. Check that the windshield deicer operates.

   OK

   The windshield deicer operates normally.

NG → see step   10 

OK → ND (MULTI-DISPLAY WAS DEFECTIVE) 

1. Remove the DEICER relay from the No. 2 engine room relay block.
   Fig 1: Removing DEICER Relay

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

NG → REPLACE DEICER RELAY 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Front View Of Wire Harness Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   No. 2 engine room relay block DEICER relay terminal 1 - Body ground	Always	11 to 14 V
   No. 2 engine room relay block DEICER relay terminal 5 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the K52 A/C amplifier assembly connector.
   Fig 3: Identifying Deicer Relay and K52 A/C Amplifier Assembly 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
   K52-4 (FDEF) - No. 2 engine room relay block DEICER relay terminal 2	Always	Below 1 Ω
   K52-4 (FDEF) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Install the DEICER relay to the No. 2 engine room relay block.
   Fig 4: Identifying Deicer Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reconnect the K52 A/C amplifier assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   K52-4 (FDEF) - K52-20 (GND)	Power switch on (IG), windshield deicer switch on	11 to 14 V
   K52-4 (FDEF) - K52-20 (GND)	Power switch on (IG), windshield deicer switch off	Below 1 V

NG → see step   10 

OK: Go to next step 

1. Remove the DEICER relay from the No. 2 engine room relay block.
   Fig 5: Identifying Deicer Connector And A64 Connector Terminals

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A64-2 (B) - No. 2 engine room relay block DEICER relay terminal 3	Always	Below 1 Ω
   A64-1 (B2) - No. 2 engine room relay block DEICER relay terminal 3	Always	Below 1 Ω
   A64-2 (B) - Body ground	Always	10 kΩ or higher
   A64-1 (B2) - Body ground	Always	10 kΩ or higher
   A64-3 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 6: Identifying A64 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A64-2 (B) - A64-3 (E)	Always	Below 1 Ω
   A64-1 (B2) - A64-3 (E)	Always	Below 1 Ω

NG → REPAIR OR REPLACE WINDSHIELD DEICER WIRE, OR REPLACE WINDSHIELD GLASS 

OK → see step   10