HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1498; Communication Malfunction (A/C Inverter Local); 2019 - 2020 MY RAV4 HV [02/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001HIR4
Model Year Start: 2019	Model: RAV4 HV	Prod Date Range: [02/2019 - 06/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1498; Communication Malfunction (A/C Inverter Local); 2019 - 2020 MY RAV4 HV [02/2019 - 06/2020]

DTC

B1498

Communication Malfunction (A/C Inverter Local)

DESCRIPTION

The hybrid vehicle control ECU assembly and compressor with motor assembly communicate via a direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information occurs.

This DTC is also detected if high-voltage power supplied from the inverter with converter assembly to the compressor control circuit is shut off.

This DTC will be stored as a history DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1498	Communication Malfunction (A/C Inverter Local)	Diagnosis condition: Ignition switch ON (READY) Malfunction status: Error or open in communication line between the hybrid vehicle control ECU assembly and compressor with motor assembly or high-voltage power source shut off	Harness or connector Hybrid vehicle control ECU assembly Compressor with motor assembly HV air conditioning wire CAN communication system Hybrid control 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:

Inspect the fuses for circuits related to this system before performing the following procedure.
After turning the ignition 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.
- for 2WD:
- for AWD:
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.
Depending on the timing of the power supply to the 12 V power supply circuit and high-voltage circuit when the ignition switch is turned to ON (READY), an abnormal information signal may be output, causing this DTC to be stored. If the output DTC is a code that was memorized in the past, check the fuses and wire harnesses. If there is no malfunction, clear the DTC.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

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

Click here

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check if hybrid control system DTCs are output.

for 2WD:
for AWD:

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO HYBRID CONTROL SYSTEM

for 2WD:
for AWD:

3.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY)

(a) Disconnect the C52 compressor with motor assembly connector.

(b) Disconnect the A29 hybrid vehicle control ECU assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C52-3 (DOUT) - A29-8 (LIN3)	Always	Below 1 Ω
C52-3 (DOUT) - A29-8 (LIN3) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - BATTERY AND BODY GROUND)

CAUTION:

Do not disconnect the connector on the high-voltage side.

(a) Disconnect the compressor with motor assembly connector.

*a	Front view of wire harness connector (to Compressor with Motor Assembly)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C52-2 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
C52-1 (IG1) - Body ground	Ignition switch ON	11 to 14 V
C52-1 (IG1) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the HV air conditioning wire.

for 2WD:
for AWD:

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Z1-2 (PB) - Z2-1 (ACPB)	Always	Below 1 Ω
Z1-1 (PE) - Z2-2 (ACPE)	Always	Below 1 Ω
Z1-2 (PB) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

REPLACE HV AIR CONDITIONING WIRE

for 2WD:
for AWD: