DESCRIPTION
The air conditioning amplifier assembly sends operation signals to the PTC heater relays when quick heater assembly operation conditions are met. Based on the signals from the air conditioning amplifier assembly, the PTC heater relays turn on, and power is supplied to the quick heater assembly installed in the air conditioning radiator assembly.
Quick Heater Assembly Operation Condition
Control ECU |
Condition |
---|---|
Air Conditioning Amplifier Assembly |
Ignition switch ON |
ECO mode: off |
|
Blower switch: On |
|
Temperature setting: MAX HOT |
|
Light control switch off |
|
|
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (HEATER ACTIVE LEVEL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Air Conditioner > Active Test
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Heater Active Level |
Quick heater assembly |
Min.: 0 Max.: 3 |
- |
Tester Display |
---|
Heater Active Level |
OK:
Heater Active Level changes normally.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT PTC HEATER RELAY |
(a) Remove the PTC heater relays.
(b) Inspect the PTC heater relays.
Click here
NG | ![]() |
REPLACE PTC HEATER RELAY |
|
3. |
CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - POWER SOURCE) |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: PTC HTR NO. 1
Standard Voltage: PTC HTR NO. 2
Standard Voltage: PTC HTR NO. 3
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the F72 air conditioning amplifier assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 2 - F72-19 (PTC1) |
Always |
Below 1 Ω |
Relay terminal 2 or F72-19 (PTC1) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 2
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 2 - F72-39 (PTC2) |
Always |
Below 1 Ω |
Relay terminal 2 or F72-39 (PTC2) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 3
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 2 -F72-20 (PTC3) |
Always |
Below 1 Ω |
Relay terminal 2 or F72-20 (PTC3) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - QUICK HEATER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the H2 quick heater assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 5 - H2-3 (B) |
Always |
Below 1 Ω |
H2-2 (E) - Body ground |
Always |
Below 1 Ω |
H2-4 (E) - Body ground |
Always |
Below 1 Ω |
Relay terminal 5 or H2-3 (B) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 2
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 5 - H2-1 (B) |
Always |
Below 1 Ω |
H2-2 (E) - Body ground |
Always |
Below 1 Ω |
Relay terminal 5 or H2-1 (B) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 3
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 5 - H2-5 (B) |
Always |
Below 1 Ω |
H2-4 (E) - Body ground |
Always |
Below 1 Ω |
Relay terminal 5 or H2-5 (B) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT QUICK HEATER ASSEMBLY |
(a) Remove the quick heater assembly.
Click here
(b) Inspect the quick heater assembly.
Click here
OK | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG | ![]() |
REPLACE QUICK HEATER ASSEMBLY |
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