Rear Window Defogger System does not Operate: Procedure

1. Select the Active Test, use Techstream to issue a control command, and then check the window defogger operation.
   AIR CONDITIONER:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Defogger Relay (Rear)	Turns rear window defogger	OFF/ON	-

   OK

   The window defogger system operates normally.

NG → See step   5 

OK: 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 same communication line.

   OK

   The air conditioning system operates normally.

NG → GO TO  AIR CONDITIONING SYSTEM  AIR CONDITIONING SYSTEM 

OK: Go to next step 

1. Replace the air conditioning control assembly*1 or multi-display*2.
   • *1: w/o Navigation System
   • *2: w/ Navigation System

NEXT: Go to next step 

1. Turn the engine switch on (IG), press the defogger switch, and check that the window defogger operates.

   OK

   The window defogger system operates normally.

NG → REPLACE A/C AMPLIFIER ASSEMBLY 

OK → END 

1. Select the Active Test, use Techstream to issue a control command, and then check the DEFOG relay operation.
2. Check that operation sound of the RR DEF relay is heard.

   Result	Proceed to
   Relay operating sound is heard	OK
   Relay operating sound is not heard	NG

OK → See step   9 

NG: Go to next step 

1. Remove the RR DEF relay from the engine room relay block.
   Fig 1: Identifying Defogger Relay

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

   Standard resistance

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

   If the result is not as specified, replace the relay.

NG → REPLACE RR DEF RELAY 

OK: Go to next step 

1. Disconnect the RR DEF relay.
   Fig 2: Identifying RR DEF Relay Connector Terminals

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

   Standard voltage

   Engine room R/B, J/B 

   Tester Connection	Condition	Specified Condition
   1 - Body ground	Engine switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE A/C NO. 2 FUSE, HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the RR DEF relay and A/C amplifier assembly connector.
   Fig 3: Checking Wire Harness (RR DEF Relay - A/C Amplifier Assembly)

   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
   2 - E1-38 (RDFG)	Always	Below 1 Ω
   2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE A/C AMPLIFIER ASSEMBLY 

1. Remove the RR DEF relay from the engine room relay block.
   Fig 4: Identifying Defogger Relay

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

   Standard resistance

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

   If the result is not as specified, replace the relay.

NG → REPLACE RR DEF RELAY 

OK: Go to next step 

1. Disconnect the RR DEF relay.
   Fig 5: Identifying RR DEF Relay Connector Terminals

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

   Standard resistance

   Engine room R/B, J/B 

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

   Standard voltage

   Engine room R/B, J/B 

   Tester Connection	Condition	Specified Condition
   5 - Body ground	Always	10 to 14 V

NG → REPAIR OR REPLACE RR DEF FUSE, HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the noise filter connector.
   Fig 6: Identifying L20 Noise Filter 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
   L20-1 - L20-2	Always	Below 1 Ω
   L20-1 - Body ground	Always	10 kΩ or higher

NG → REPLACE NOISE FILTER 

OK: Go to next step 

1. Disconnect the RR DEF relay and defogger wire connectors.
   Fig 7: Checking Wire Harness (RR DEF Relay - 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
   3 - L20-2	Always	Below 1 Ω
   3 - Body ground	Always	10 kΩ or higher

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 8: Checking Wire Harness (Noise Filter - Defogger Wire Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L20-1 - L25-1	Always	Below 1 Ω
   L20-1 - Body ground	Always	10 kΩ or higher

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 9: Identifying N1 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   N1-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE