Air Conditioning System (For Manual Air Conditioning System) Ptc Heater Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT PTC HEATER RELAY (PTC HTR1, PTC HTR2, PTC HTR3)

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - BATTERY)

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - AIR CONDITIONING AMPLIFIER AND BODY GROUND)

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

CHECK HARNESS AND CONNECTOR (QUICK HEATER - BODY GROUND)

INSPECT QUICK HEATER ASSEMBLY

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses and relays for circuits related to this system before performing the following inspection procedure.

1. Remove the PTC heater relays from the engine room relay block and junction block assembly.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage is not applied between terminals 1 and 2	10 kΩ or higher
   	Battery voltage is applied between terminals 1 and 2	Below 1 Ω

1. Remove the PTC heater relays from the engine room relay block and junction block assembly.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   PTC HTR1 relay terminal 5 - Body ground	Always	11 to 14 V
   PTC HTR2 relay terminal 5 - Body ground
   PTC HTR3 relay terminal 5 - Body ground

   Text in Illustration

   *a	Component without relay installed (Engine Room Relay Block and Junction Block Assembly)
   *1	PTC Heater Relay (PTC HTR3)
   *2	PTC Heater Relay (PTC HTR2)
   *3	PTC Heater Relay (PTC HTR1)

1. Remove the PTC heater relays from the engine room relay block and junction block assembly.
   

2. Disconnect the E81 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 HTR1 relay terminal 1 - E81-3 (PTC1)	Always	Below 1 Ω
   PTC HTR2 relay terminal 1 - E81-22 (PTC2)
   PTC HTR3 relay terminal 1 - E81-4 (PTC3)
   PTC HTR1 relay terminal 1 - Body ground	Always	10 kΩ or higher
   PTC HTR2 relay terminal 1 - Body ground
   PTC HTR3 relay terminal 1 - Body ground

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   PTC HTR1 relay terminal 2 - Body ground	Always	Below 1 Ω
   PTC HTR2 relay terminal 2 - Body ground
   PTC HTR3 relay terminal 2 - Body ground

1. Remove the PTC heater relays from the engine room relay block and junction block assembly.
   

2. Disconnect the E33 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 HTR1 relay terminal 3 - E33-2 (B)	Always	Below 1 Ω
   PTC HTR2 relay terminal 3 - E33-1 (B)
   PTC HTR3 relay terminal 3 - E33-3 (B)
   PTC HTR1 relay terminal 3 - Body ground	Always	10 kΩ or higher
   PTC HTR2 relay terminal 3 - Body ground
   PTC HTR3 relay terminal 3 - Body ground

1. Disconnect the E34 quick heater assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E34-1 (E) - Body ground	Always	Below 1 Ω
   E34-2 (E) - Body ground

   Text in Illustration

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

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

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1 (B) - 1 (E)	Always	Below 1 kΩ
   2 (B) - 1 (E)
   2 (B) - 2 (E)
   3 (B) - 2 (E)

1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   E81-3 (PTC1) - Body ground	Engine idling Set temperature MAX. HOT Engine coolant temperature below 65°C (149°F) Ambient temperature below 10°C (50°F) Blower switch off → LO level	Below 1 V → 11 to 14 V*
   E81-22 (PTC2) - Body ground
   E81-4 (PTC3) - Body ground

   Text in Illustration

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

   HINT:

   *: After the measurement conditions are met, wait 30 seconds before performing measurements.