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Home >> Toyota >> 2011 >> Matrix Base, Automatic >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Diagnostic Codes (B1412 - B1499) & Circuit Tests) >> Air Conditioning System >> Circuit Tests >> PTC Heater Circuit >> Procedure

PTC Heater Circuit: Procedure

  1. INSPECT RELAY (HTR SUB NO. 1, HTR SUB NO. 3) 
    1. Remove the HTR SUB No. 1 and HTR SUB No. 3 relays from the engine room relay block and junction block.
      Fig 1: Inspecting Relay (HTR SUB No. 1 And HTR SUB No. 3)
      GTY224343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Item Condition Specified Condition
      3 - 5 When battery voltage is not applied between terminal 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied between terminal 1 and 2 Below 1 Ω
    3. Install the HTR SUB No. 1 and HTR SUB No. 3 relays to the engine room relay block and junction block.

    NG → REPLACE RELAY (HTR SUB NO. 1, HTR SUB NO. 3) 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND) 
    1. Disconnect the connector from the A/C amplifier.
    2. Remove the HTR SUB No. 1 and HTR SUB No. 3 relays from the engine room relay block and junction block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E9-9 (PTC1) - HTR SUB No. 1 relay terminal 2 Always Below 1 Ω
      E9-10 (PTC2) - HTR SUB No. 3 relay terminal 1 Always Below 1 Ω
      E9-9 (PTC1) - Body ground Always 10 kΩ or higher
      E9-10 (PTC2) - Body ground Always 10 kΩ or higher
      HTR SUB No. 1 relay terminal 1 - Body ground Always Below 1 Ω
      HTR SUB No. 3 relay terminal 2 - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT AIR CONDITIONING AMPLIFIER 
    1. Reconnect the connector to the A/C amplifier.
    2. Remove the A/C amplifier with the connectors still connected.
      Fig 2: Inspecting Air Conditioning Amplifier E9 Connector Terminals
      GTY292134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      E9-9 (PTC1) - Body ground Ignition switch: ON
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: OFF      		 Below 1 V
      E9-9 (PTC1) - Body ground Engine running (1250 RPM or higher)
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: ON      		 11 to 14 V
      E9-10 (PTC2) - Body ground Ignition switch: ON
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: OFF      		 Below 1 V
      E9-10 (PTC2) - Body ground Engine running (1250 RPM or higher)
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: ON      		 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (A/C Amplifier)

    NG → See step   6 

    OK: Go to next step 

  4. INSPECT PTC HEATER 
    1. Disconnect the connector from the PTC heater.
      Fig 3: Inspecting PTC Heater A9 & A10 Connector Terminals
      GTY292753Courtesy 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
      A9-1 (B) - A10-1 (E) Always Below 1 Ω
      A9-3 (B) - A10-2 (E) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (PTC Heater)

    NG → See step   7 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (PTC HEATER - BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 4: Checking Harness And A9 Connector (PTC Heater - Battery)
      GTY293752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      A9-1 (B) - Body ground Ignition switch: ON
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: OFF      		 Below 1 V
      A9-1 (B) - Body ground Engine running (1250 RPM or higher)
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: ON      		 11 to 14 V
      A9-3 (B) - Body ground Ignition switch: ON
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: OFF      		 Below 1 V
      A9-3 (B) - Body ground Engine running (1250 RPM or higher)
      Temperature setting: MAX. HOT
      Ambient temperature: 10°C (50°F) or lower
      Engine coolant temperature: 65°C (149°F) or lower
      Light control switch: OFF
      Blower switch: ON      		 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to PTC Heater)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (PTC HEATER - BODY GROUND) 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN  PROBLEM SYMPTOMS TABLE 
  7. REPLACE PTC HEATER. Refer to  REMOVAL 
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