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When the PTC heater does not work
under the following conditions, the PTC heater switch system
or the PTC heater circuit system may be defective.
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PTC heater operating
conditions
- PTC heater switch: ON
- Air outlet: FOOT/DEF, FOOT,
FACE/FOOT
- Temperature control dial: MAX HOT
- Coolant temperature: 82 degrees celsius or
less
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- Malfunction of the PTC heater switch system
- Damaged the wiring harness or connectors
- Malfunction of the PTC heater relay 1
- Malfunction of the PTC heater relay 2
- Malfunction of the PTC heater
- Malfunction of the automatic air conditioner control
panel (A/C-ECU)
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Check that the following service
data display contents are normal. (Refer to .)
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- Item 35: PTC heater switch
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Q.
Does the blower motor work normally?
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![](../../../img/55/AC313392AB00ENG.png)
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Q.
Is the check result normal?
Go to Step
3.
Repair
the connector.
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![](../../../img/55/AC313392AB00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side. (2)Turn the ignition
switch to the "ON" position. (3)Turn the PTC heater
switch to the "ON" position.
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![](../../../img/55/AC310507AT00ENG.png)
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(4)Voltage between terminal 26 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
28.
Inspection Procedure
28: Refer to PTC heater switch system <LHD>
.
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![](../../../img/55/AC313392AH00ENG.png)
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Q.
Is the check result normal?
Go to Step
5.
Repair
the connector.
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![](../../../img/55/AC313392AH00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side.
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![](../../../img/55/AC310506AQ00ENG.png)
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(2)Continuity between terminal 1
and body earth OK: 2Ω or
less
Q.
Is the check result normal?
Go to Step
7.
Go to Step
6.
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![](../../../img/55/AC313392AH00ENG.png)
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- Check the PTC heater earth line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313392AH00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side.
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![](../../../img/55/AC310506AR00ENG.png)
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(2)Continuity between terminal 3
and body earth OK: 2Ω or
less
Q.
Is the check result normal?
Go to Step
9.
Go to Step
8.
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![](../../../img/55/AC313392AH00ENG.png)
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- Check the PTC heater earth line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313392AC00ENG.png)
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Q.
Is the check result normal?
Go to Step
10.
Repair
the connector.
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![](../../../img/55/AC313392AH00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side. (2)Turn the ignition
switch to the "ON" position.
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![](../../../img/55/AC313392AC00ENG.png)
![](../../../img/55/AC312783AB00ENG.png)
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(3)Disconnect A/C-ECU
connector C-105 and earth terminal 46.
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![](../../../img/55/AC310507AU00ENG.png)
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(4)Voltage between terminal 2 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
19.
Go to Step
11.
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![](../../../img/55/AC313398AD00ENG.png)
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Q.
Is the check result normal?
Go to Step
12.
Repair
the connector.
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Q.
Is the PTC heater switch relay 1 in good
condition?
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Replace the PTC
heater switch relay 1.
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![](../../../img/55/AC313398AD00ENG.png)
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(1)Remove the relay, and measure at
the relay block side. (2)Turn the ignition switch to the
"ON" position.
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![](../../../img/55/AC310507AV00ENG.png)
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(3)Voltage between terminal 3 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
15.
Go to Step
14.
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![](../../../img/55/AC313392AI00ENG.png)
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note |
Prior to the wiring harness
inspection, check junction block connectors
C-202, C-203 and joint connector C-32, and
repair if necessary.
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- Check the PTC heater relay 1 earth supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313398AD00ENG.png)
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(1)Remove the relay, and measure at
the relay block side.
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![](../../../img/55/AC310507AW00ENG.png)
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(2)Voltage between terminal 4 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
17.
Go to Step
16.
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![](../../../img/55/AC313392AJ00ENG.png)
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note |
Prior to the wiring harness
inspection, check intermediate connector C-124,
and repair if necessary.
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- Check the PTC heater relay 1 power supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313393AK00ENG.png)
![](../../../img/55/AC313398AD00ENG.png)
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note |
Prior to the wiring harness
inspection, check joint connector C-01, and
repair if necessary.
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- Check the PTC heater relay 1 earth line for open or
short circuit.
Q.
Is the check result normal?
Go to Step
18.
Repair
the wiring harness.
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![](../../../img/55/AC313392AH00ENG.png)
![](../../../img/55/AC313398AD00ENG.png)
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- Check the PTC heater relay 1 power supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313392AH00ENG.png)
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(1)Disconnect the connector, and
measure at the wiring harness side. (2)Turn the ignition
switch to the "ON" position.
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![](../../../img/55/AC313392AC00ENG.png)
![](../../../img/55/AC312783AB00ENG.png)
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(3)Disconnect A/C-ECU
connector C-105 and earth terminal 46.
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![](../../../img/55/AC310507EG00ENG.png)
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(4)Voltage between terminal 4 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
28.
Go to Step
20.
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![](../../../img/55/AC313398AE00ENG.png)
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Q.
Is the check result normal?
Go to Step
21.
Repair
the connector.
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Q.
Is the PTC heater relay 2 in good condition?
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Replace the PTC
heater relay 2.
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![](../../../img/55/AC313398AE00ENG.png)
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(1)Remove the relay, and measure at
the relay block side. (2)Turn the ignition switch to the
"ON" position.
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![](../../../img/55/AC310507AY00ENG.png)
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(3)Voltage between terminal 3 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
24.
Go to Step
23.
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![](../../../img/55/AC313392AI00ENG.png)
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note |
Prior to the wiring harness
inspection, check junction block connectors
C-202, C-203 and joint connector C-32, and
repair if necessary.
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- Check the PTC heater relay 2 power supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313398AE00ENG.png)
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(1)Remove the relay, and measure at
the relay block side.
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![](../../../img/55/AC310507AZ00ENG.png)
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(2)Voltage between terminal 4 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
26.
Go to Step
25.
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![](../../../img/55/AC313392AJ00ENG.png)
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note |
Prior to the wiring harness
inspection, check intermediate connector C-124,
and repair if necessary.
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- Check the PTC heater relay 2 power supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/55/AC313393AK00ENG.png)
![](../../../img/55/AC313398AE00ENG.png)
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note |
Prior to the wiring harness
inspection, check joint connector C-01, and
repair if necessary.
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- Check the PTC heater relay 2 earth line for open or
short circuit.
Q.
Is the check result normal?
Go to Step
27.
Repair
the wiring harness.
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![](../../../img/55/AC313392AH00ENG.png)
![](../../../img/55/AC313398AE00ENG.png)
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- Check the PTC heater power supply line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
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Check that the PTC heater works
normally.
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Q.
Is the check result normal?
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The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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