Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPHI
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 02/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): P1C7C49; Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure; 2019 MY RAV4 HV [11/2018 - 02/2019]

DTC

P1C7C49

Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

DESCRIPTION

This DTC is stored if there is insulation malfunction in the high-voltage circuit in the air conditioning system. Possible causes are poor insulation in the compressor with motor assembly, or mixing of any oil other than ND-OIL 11 in the refrigerant cycle.

A high-voltage motor is built into the compressor with motor assembly and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used because a leakage of electrical power may occur if regular compressor oil (ND-OIL 8) is used.

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P1C7C49

Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

High voltage system insulation malfunction
  • Compressor oil
  • Refrigerant pipe line
  • Compressor with motor assembly
  • CAN communication system

Memorized

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): PRECAUTION

  • Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigerant cycle, causing a DTC to be output.
  • If other oil is accidentally used and a DTC is output, collect as much oil in the refrigerant cycle into the compressor with motor assembly as possible and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio amount.
  • Replace the main components of the air conditioning cycle (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing a DTC to be output.
  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

HINT:

If it can be confirmed that any compressor oil other than ND-OIL 11 has been used in the vehicle, replace the main components of the air conditioning cycle.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

Result

Proceed to

CAN communication system DTCs are not output

A

CAN communication system DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CLEAR DTC

(a) Clear the DTCs.

Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): DTC CHECK / CLEAR

Powertrain > Hybrid Control > Clear DTCs

HINT:

When DTC P1C7C49 is output, the power switch is cannot be turned on (READY), so use the Techstream and clear DTC P1C7C49.

NEXT

3.

INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

CAUTION:

Because the compressor with motor assembly has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection.

(a) Turn the power switch on (READY).

(b) Prepare the vehicle according to the table below for 3 minutes.

Item

Condition

Blower Speed

HI

Set Temperature

MAX COLD

A/C Switch

On

(c) Turn the power switch off.

(d) Remove the service plug grip.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: REMOVAL

CAUTION:

Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

(e) Disconnect the compressor with motor assembly connector.

*a

Component without harness connected

(Compressor with Motor Assembly)

(f) Using a megohmmeter, measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z1-1 (PE) - Body ground

Always

2 MΩ or higher

Z1-2 (PB) - Body ground

Always

2 MΩ or higher
NG

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

OK

4.

INSPECT AIR CONDITIONING CYCLE

CAUTION:

Because the compressor with motor assembly has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection.

(a) Reconnect the Z1 the compressor with motor assembly connector.

(b) Install the service plug grip.

Click here 2019 - 2024 MY RAV4 HV [11/2018 -        ]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: INSTALLATION

(c) Turn the power switch on (READY).

(d) Set the A/C temperature to 25°C (77°F) and blower switch to LO and then operate the compressor with motor assembly for 10 minutes to circulate the refrigerant and collect as much compressor oil as possible in the compressor with motor assembly.

(e) Turn the power switch off.

(f) Using a spot cooler or other tool, cool down the compressor with motor assembly for 30 minutes, or leave the vehicle overnight before inspection.

NOTICE:

Do not operate the compressor before inspection.

(g) Remove the service plug grip.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: REMOVAL

CAUTION:

Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

(h) Disconnect the compressor with motor assembly connector.

*a

Component without harness connected

(Compressor with Motor Assembly)

(i) Using a megohmmeter, measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z1-1 (PE) - Body ground

Always

3 MΩ or higher

Z1-2 (PB) - Body ground

Always

3 MΩ or higher

NOTICE:

If the results are out of the specified range, replace the compressor without operating it.

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

REPLACE AIR CONDITIONING CYCLE