B1498

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1498: Communication Malfunction (A/C Inverter Local)

DTC B1498 - Communication Malfunction (A/C Inverter Local)

DESCRIPTION

The hybrid control ECU and A/C inverter transmit information to one another via communication line. Compressor control is stopped and the DTC is output if communication information is cut off or abnormal information occurs.
The output DTC is memorized as previous trouble.





NOTE: The A/C inverter is integrated with the inverter with converter. It is necessary to replace the PCU box if the A/C inverter (inverter with converter) needs to be replaced because the A/C inverter (inverter with converter) cannot be replaced alone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (HYBRID CONTROL ECU - INVERTER WITH CONVERTER)




(a) Disconnect the H15 and H16 ECU connectors.
(b) Disconnect the I11 inverter connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

2. CHECK DIAGNOSTIC TROUBLE CODE
(a) Connect the H15 and H16 ECU connectors.
(b) Connect the I11 inverter connector.
(c) Check if DTCs for the hybrid control system are output using Techstream.
OK:
DTCs are not output in the hybrid control system.
NG -- GO TO HYBRID CONTROL SYSTEM
OK -- REPLACE A/C INVERTER