AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) PTC Heater Circuit

DESCRIPTION

The quick heater relays is controlled in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   PERFORM ACTIVE TEST USING GTS (HEATER ACTIVE LEVEL)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

   5. According to the display on the GTS, perform the Active Test.

      Table 1. Air Conditioner

      Tester Display	Test Part	Control Range	Diagnostic Note
      Heater Active Level	Heater level	Min.: 0, Max.: 3	-

      OK
      Heater Active Level changes normally.

   
   
   • OKClick here
   • NG

     PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

2. Click here

   INSPECT QUICK HEATER RELAY

   
   

   1. Remove the quick heater relay.

   2. Inspect the quick heater relay (Click here).

   
   
   • OKClick here
   • NG

     REPLACE QUICK HEATER RELAY

3. Click here

   INSPECT QUICK HEATER ASSEMBLY

   
   

   1. Remove the quick heater assembly (Click here).

   2. Inspect the quick heater assembly (Click here).

   
   
   • OKClick here
   • NG

     REPLACE QUICK HEATER ASSEMBLY (Click here)

4. Click here

   CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - BATTERY AND IG1 NO. 1 RELAY)

   
   

   1. Remove the quick heater relay.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition PTC HTR NO. 1-5 - Body ground Always 11 to 14 V PTC HTR NO. 1-2 - Body ground Ignition switch ON 11 to 14 V PTC HTR NO. 2-3 - Body ground Always 11 to 14 V PTC HTR NO. 2-1 - Body ground Ignition switch ON 11 to 14 V PTC HTR NO. 3-3 - Body ground Always 11 to 14 V PTC HTR NO. 3-2 - Body ground Ignition switch ON 11 to 14 V

      Table 2. Text in Illustration

      *1	No. 2 Engine Room Relay Block
      *2	PTC HTR NO. 1 Relay Holder
      *3	PTC HTR NO. 2 Relay Holder
      *4	PTC HTR NO. 3 Relay Holder

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

   CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   

   1. Remove the quick heater relay.

   2. Disconnect the F42 air conditioning amplifier assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition PTC HTR NO. 1-1 - F42-40 (PTC1) Always Below 1 Ω PTC HTR NO. 2-2 - F42-39 (PTC2) Always Below 1 Ω PTC HTR NO. 3-1 - F42-3 (PTC3) Always Below 1 Ω PTC HTR NO. 1-1 or F42-40 (PTC1) - Body ground Always 10 kΩ or higher PTC HTR NO. 2-2 or F42-39 (PTC2) - Body ground Always 10 kΩ or higher PTC HTR NO. 3-1 or F42-3 (PTC3) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   CHECK HARNESS AND CONNECTOR (QUICK HEATER RELAY - QUICK HEATER ASSEMBLY)

   
   

   1. Remove the quick heater relay.

   2. Disconnect the A44 quick heater assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition PTC HTR NO. 1-3 - A44-2 (B) Always Below 1 Ω PTC HTR NO. 2-5 - A44-3 (B) Always Below 1 Ω PTC HTR NO. 3-5 - A44-1 (B) Always Below 1 Ω PTC HTR NO. 1-3 or A44-2 (B) - Body ground Always 10 kΩ or higher PTC HTR NO. 2-5 or A44-3 (B) - Body ground Always 10 kΩ or higher PTC HTR NO. 3-5 or A44-1 (B) - Body ground Always 10 kΩ or higher

   
   
   • OK

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR