PTC Heater Circuit [10/2014 - ]: Procedure

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. Check the operation by referring to the table below.
   AIR CONDITIONER
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Heater Active Level	Quick heater assembly	Min.: 0, Max.: 2	-

   OK

   Heater Active Level changes normally.

Result: 

NG 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] or PROBLEM SYMPTOMS TABLE [10/2015 - ] )

Result: 

OK 

See step  2

1. Remove the PTC HTR NO. 1 relay and PTC HTR NO. 2 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	Auxiliary battery voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Auxiliary battery voltage is applied between terminals 1 and 2	Below 1 Ω

Result: 

NG 

REPLACE PTC HEATER RELAY 

Result: 

OK 

See step  3

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

   Standard Voltage

   PTC1
   
   

   Tester Connection	Condition	Specified Condition
   3 - Body ground	Power switch off	11 to 14 V
   2 - Body ground	Power switch on (IG)	11 to 14 V

   PTC2
   
   

   Tester Connection	Condition	Specified Condition
   3 - Body ground	Power switch off	11 to 14 V
   2 - Body ground	Power switch on (IG)	11 to 14 V

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the D62 air conditioning amplifier assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   PTC1
   
   

   Tester Connection	Condition	Specified Condition
   1 - D62-15 (PTC1)	Always	Below 1 Ω
   1 - Body ground	Always	10 kΩ or higher

   PTC2
   
   

   Tester Connection	Condition	Specified Condition
   1 - D62-16 (PTC2)	Always	Below 1 Ω
   1 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the D106 quick heater assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   PTC1
   
   

   Tester Connection	Condition	Specified Condition
   5 - D106-1 (B)	Always	Below 1 Ω
   5 - Body ground	Always	10 kΩ or higher

   PTC2
   
   

   Tester Connection	Condition	Specified Condition
   5 - D106-2 (B)	Always	Below 1 Ω
   5 - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the quick heater assembly (Refer to REMOVAL [10/2014 - ] ).
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D106-1 (B) - Ground terminal	Always	Below 1 Ω
   D106-2 (B) - Ground terminal	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Quick Heater Assembly)

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPLACE QUICK HEATER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )