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PTC Heater Circuit [11/2016 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    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.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Heater Active Level Quick heater assembly Min.: 0
      Max.: 3      		 -

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Heater Active Level

      OK

      Heater Active Level changes normally.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2016 - ] 

    Result:  2

    NG 

    See step  2

  2. INSPECT PTC HEATER RELAY 
    1. Remove the PTC heater relays.
    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
      GTY453085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (PTC Heater Relay)

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE PTC HEATER RELAY. Refer to  PARTS LOCATION [11/2016 - ] 

    Result:  1

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - POWER SOURCE) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      PTC HTR NO. 1 

      Tester Connection Condition Specified Condition
      5 (PTC HTR NO. 1 Relay) - Body ground Power switch off 11 to 14 V
      1 (PTC HTR NO. 1 Relay) - Body ground Power switch off Below 1 V
      1 (PTC HTR NO. 1 Relay) - Body ground Power switch on (IG) 11 to 14 V

      Standard Voltage

      PTC HTR NO. 2 

      Tester Connection Condition Specified Condition
      5 (PTC HTR NO. 2 Relay) - Body ground Power switch off 11 to 14 V
      1 (PTC HTR NO. 2 Relay) - Body ground Power switch off Below 1 V
      1 (PTC HTR NO. 2 Relay) - Body ground Power switch on (IG) 11 to 14 V

      Standard Voltage

      PTC HTR NO. 3 

      Tester Connection Condition Specified Condition
      5 (PTC HTR NO. 3 Relay) - Body ground Power switch off 11 to 14 V
      1 (PTC HTR NO. 3 Relay) - Body ground Power switch off Below 1 V
      1 (PTC HTR NO. 3 Relay) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the F80 air conditioning amplifier assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      PTC HTR NO. 1 

      Tester Connection Condition Specified Condition
      2 (PTC HTR NO. 1 Relay) - F80-40 (PTC1) Always Below 1 Ω
      2 (PTC HTR NO. 1 Relay) - Body ground Always 10 kΩ or higher

      Standard Resistance

      PTC HTR NO. 2 

      Tester Connection Condition Specified Condition
      2 (PTC HTR NO. 2 Relay) - F80-3 (PTC2) Always Below 1 Ω
      2 (PTC HTR NO. 2 Relay) - Body ground Always 10 kΩ or higher

      Standard Resistance

      PTC HTR NO. 3 

      Tester Connection Condition Specified Condition
      2 (PTC HTR NO. 3 Relay) - F80-36 (PTC3) Always Below 1 Ω
      2 (PTC HTR NO. 3 Relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - QUICK HEATER ASSEMBLY) 
    1. Disconnect the F36 quick heater assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      PTC HTR NO. 1 

      Tester Connection Condition Specified Condition
      3 (PTC HTR NO. 1 Relay) - F36-2 (B) Always Below 1 Ω
      F36-2 (B) - Body ground Always 10 kΩ or higher

      Standard Resistance

      PTC HTR NO. 2 

      Tester Connection Condition Specified Condition
      3 (PTC HTR NO. 2 Relay) - F36-3 (B) Always Below 1 Ω
      F36-3 (B) - Body ground Always 10 kΩ or higher

      Standard Resistance

      PTC HTR NO. 3 

      Tester Connection Condition Specified Condition
      3 (PTC HTR NO. 3 Relay) - F36-1 (B) Always Below 1 Ω
      F36-1 (B) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - BODY GROUND) 
    1. Disconnect the F37 quick heater assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F37-1 (E) - Body ground Always Below 1 Ω
      F37-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  7

  7. INSPECT QUICK HEATER ASSEMBLY 
    1. Remove the quick heater assembly.

      Refer to REMOVAL [02/2014 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY430689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Quick Heater Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F36-1 (B) - F37-1 (E) Always Below 1 Ω
      F36-2 (B) - F37-2 (E) Always Below 1 Ω
      F36-3 (B) - F37-1 (E) Always Below 1 Ω
      F36-3 (B) - F37-2 (E) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  2

    NG 

    REPLACE QUICK HEATER ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

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