POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER INSPECTION

id071100701600

PTC Heater

Warning

<<High voltage>>

• The PTC heater is a high voltage part and is dangerous. Therefore, the terminal voltage inspection cannot be performed. Perform troubleshooting for the DTCs output by the PCM.

Note

• The high voltage parts can be identified as follows.

― Parts that are connected using orange wiring harnesses

― Parts with high voltage warning label attached

DTC inspection

1. Connect the M-MDS to the DLC-2.

2. Perform the PCM DTC inspection using the M-MDS, and if a PTC heater related DTC is output, repair the malfunctioning location according to the applicable DTC troubleshooting.

1. Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2. Remove the center lower panel. (See CENTER LOWER PANEL REMOVAL/INSTALLATION.)

3. Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

4. Connect the negative lead of the tester to the body ground.

5. Insert the positive lead into the PTC heater control and measure the voltage of each terminal following the terminal voltage table.

• If there is any malfunction, inspect the parts under “Inspection items”.

Terminal voltage table (reference)

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Terminal

Signal name

Connection

Measurement condition

Voltage (V)

Inspection items

A

GND

•  PCM

•  Electric compressor control

Continuous

1.0 or less

•  PCM

•  Electric compressor control

•  Related wiring harness

B

LIN

•  PCM

•  Electric compressor control

Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.

Related wiring harness

C

—

—

—

—

—

D

IG

A/C relay

Main power is switched to ACC or ON (READY off)

V_B

•  Lead-acid battery

•  F11 7.5A fuse

•  A/C relay

•  Related wiring harness

Main power is switched OFF

1.0 or less

Terminal	Signal name	Connection	Measurement condition	Voltage (V)	Inspection items
A	GND	• PCM • Electric compressor control	Continuous	1.0 or less	• PCM • Electric compressor control • Related wiring harness
B	LIN	• PCM • Electric compressor control	Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.		Related wiring harness
C	—	—	—	—	—
D	IG	A/C relay	Main power is switched to ACC or ON (READY off)	V_B	• Lead-acid battery • F11 7.5A fuse • A/C relay • Related wiring harness
D	IG	A/C relay	Main power is switched OFF	1.0 or less