AIR CONDITIONING SYSTEM, Diagnostic DTC:B1498/98

DTC Code	DTC Name
B1498/98	Communication Malfunction (A/C Inverter Local)

DESCRIPTION

The EV control ECU 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
B1498/98	Communication Malfunction (A/C Inverter Local)	Any of the following conditions is met: Communication line error between the EV control ECU and compressor with motor assembly Communication line open between the EV control ECU and compressor with motor assembly High-voltage power source is shut off	Harness or connector between EV control ECU, compressor with motor assembly and body ground EV control ECU Compressor with motor assembly No. 3 motor wire (harness or connector between compressor with motor assembly and inverter with converter assembly) EV fuse CAN communication system Hybrid control system	Memorized

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1498/98

Communication Malfunction (A/C Inverter Local)

Any of the following conditions is met:

Communication line error between the EV control ECU and compressor with motor assembly
Communication line open between the EV control ECU and compressor with motor assembly
High-voltage power source is shut off

Harness or connector between EV control ECU, compressor with motor assembly and body ground
EV control ECU
Compressor with motor assembly
No. 3 motor wire (harness or connector between compressor with motor assembly and inverter with converter assembly)
EV fuse
CAN communication system
Hybrid control system

Memorized

DTC Detection Conditions
		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Power switch on (READY)	○	○	○
Malfunction Status	Communication line error between the EV control ECU and compressor with motor assembly	○	-	-
	Communication line open between the EV control ECU and compressor with motor assembly	-	○	-
	High-voltage power source is shut off	-	-	○
Detection Time		-	-	-
Number of Trips		1 trip	1 trip	1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

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.

Note

Inspect the fuses for circuits related to this system before performing the following procedure.
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
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 power switch is turned 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

CHECK CAN COMMUNICATION SYSTEM

Using the GTS, check if the CAN communication system is functioning normally.

for LHD: Click here

for RHD: Click here

Result

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output (for LHD)	B
CAN communication system DTCs are output (for RHD)	C

GO TO CAN COMMUNICATION SYSTEM Click here

CHECK FOR DTC

Check if hybrid control system DTCs are output.

Click here

Powertrain > EV > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
Only DTC P3108-536 is output	A
DTCs other than P3108 are output	B

GO TO HYBRID CONTROL SYSTEM Click here

CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - POWER SOURCE CIRCUIT)

CAUTION:

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

*a
Front view of wire harness connector

(to Compressor with Motor Assembly)

Disconnect the compressor with motor assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D2-5 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
D2-6 (IG1) - D2-5 (GND)	Power switch on (IG)	11 to 14 V
D2-6 (IG1) - D2-5 (GND)	Power switch off	Below 1 V

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

Disconnect the A27 EV control ECU connector.
Disconnect the D2 compressor with motor assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D2-1 (CLK) - A27-10 (CLK)	Always	Below 1 Ω
D2-2 (DIN) - A27-9 (ITE)	Always	Below 1 Ω
D2-3 (DOUT) - A27-8 (ETI)	Always	Below 1 Ω
D2-1 (CLK) or A27-10 (CLK) - Body ground	Always	10 kΩ or higher
D2-2 (DIN) or A27-9 (ITE) - Body ground	Always	10 kΩ or higher
D2-3 (DOUT) or A27-8 (ETI) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT EV FUSE

CAUTION:

Be sure to wear insulated gloves.

Turn the power switch off.
Remove the service plug grip.

Click here

CAUTION:

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

Note

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.
Remove the connector cover assembly.

Click here

Note

Be sure to prevent foreign matter or water from entering the inverter with converter assembly.
*1 EV Fuse

Check that bolts A and B are tightened securely.

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

Standard Resistance

Tester Item

(Tester Connection)

Condition

Specified Condition

EV fuse

(A - B)

Always

Below 1 Ω

Result

Proceed to
OK
NG

REPLACE EV FUSE Click here

INSPECT NO. 3 MOTOR WIRE

CAUTION:

Be sure to wear insulated gloves.

Disconnect the E3 and E4 No. 3 motor wire connectors.

Click here

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E3-1 (PE) - E4-2 (ACPE)	Always	Below 1 Ω
E3-2 (PB) - E4-1 (ACPB)	Always	Below 1 Ω
E3-1 (PE) or E4-2 (ACPE) - Body ground	Always	10 kΩ or higher
E3-2 (PB) or E4-1 (ACPB) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPLACE NO. 3 MOTOR WIRE Click here

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

Replace the compressor with motor assembly.

Click here

Tech Tips

Since the compressor with motor assembly cannot be inspected while it is removed from the vehicle, replace the compressor with motor assembly with a new or known good one and check that the condition returns to normal.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1498/98 is not output	A
DTC B1498/98 is output	B

END (COMPRESSOR WITH MOTOR ASSEMBLY WAS DEFECTIVE)

REPLACE EV CONTROL ECU Click here