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 |
Engine running |
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 |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to 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.
NG |
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.
*1 |
NO. 2 ENGINE ROOM RELAY BLOCK |
*2 |
PTC HTR NO. 1 Relay |
*3 |
PTC HTR NO. 2 Relay |
*4 |
PTC HTR NO. 3 Relay |
Standard Voltage:
PTC HTR NO. 1
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
Relay terminal 3 - Body ground |
Ignition switch off |
11 to 14 V |
Relay terminal 1 - Body ground |
Ignition switch off |
Below 1 V |
Relay terminal 1 - Body ground |
Ignition switch on (IG) |
11 to 14 V |
Standard Voltage:
PTC HTR NO. 2
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
Relay terminal 3 - Body ground |
Ignition switch off |
11 to 14 V |
Relay terminal 1 - Body ground |
Ignition switch off |
Below 1 V |
Relay terminal 1 - Body ground |
Ignition switch on (IG) |
11 to 14 V |
Standard Voltage:
PTC HTR NO. 3
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
Relay terminal 3 - Body ground |
Ignition switch off |
11 to 14 V |
Relay terminal 1 - Body ground |
Ignition switch off |
Below 1 V |
Relay terminal 1 - Body ground |
Ignition switch on (IG) |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the F138 and F139 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 - F139-18 (PTC1) |
Always |
Below 1 Ω |
Relay terminal 2 or F139-18 (PTC1) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 2
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 2 - F138-10 (PTC2) |
Always |
Below 1 Ω |
Relay terminal 2 or F138-10 (PTC2) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 3
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 2 - F138-11 (PTC3) |
Always |
Below 1 Ω |
Relay terminal 2 or F138-11 (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 H1 and H3 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 - H1-3 (B) |
Always |
Below 1 Ω |
H1-2 (E) - Body ground |
Always |
Below 1 Ω |
H3-1 (E) - Body ground |
Always |
Below 1 Ω |
H1-3 (B) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 2
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 5 - H1-1 (B) |
Always |
Below 1 Ω |
H1-2 (E) - Body ground |
Always |
Below 1 Ω |
H1-1 (B) - Body ground |
Always |
10 kΩ or higher |
Standard Resistance:
PTC HTR NO. 3
Tester Connection |
Condition |
Specified Condition |
---|---|---|
Relay terminal 5 - H3-2 (B) |
Always |
Below 1 Ω |
H3-1 (E) - Body ground |
Always |
Below 1 Ω |
H3-2 (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 |
Toyota CH-R Service Manual > Meter / Gauge System: Data List / Active Test
DATA LIST / ACTIVE TEST
DATA LIST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when deciding whether a part
is faulty or not.
HINT:
Using the Techstream to read the Data List allows the ...
Toyota CH-R Service Manual > Occupant Classification System: Passenger Side Buckle Switch Circuit Malfunction (B1771)
DESCRIPTION
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DTC No.
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