Air Conditioning. Dtc B1497/97 Bus Ic Communication Malfunction

Heater & Air Conditioning System. Lexus Gs430, Gs300. Uzs190 Grs190

Air Conditioning. Lexus Gs430, Gs300. Uzs190 Grs190

DTC B1497/97 BUS IC Communication Malfunction

DESCRIPTION

The air conditioning harness connects the air conditioning amplifier and each servo. The air conditioning amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the air conditioning amplifier.

DTC No.	DTC Detection Condition	Trouble Area
B1497/97	Communication line error or open	Wire harness A/C amplifier

INSPECTION PROCEDURE

1.CHECK AIR CONDITIONING AMPLIFIER

Lexus Gs430, Gs300. Uzs190 Grs190.Air Conditioning.Air Conditioning System.
Dtc
B1497/97 Bus Ic Communication Malfunction

Remove the A/C amplifier with its connectors still connected.

Measure the resistance of the connector.
Standard resistance:
Tester Connection
Condition
Specified Condition
e1-2 (BUSG) - Body ground
Always
Below 1 Ω

REPLACE AIR CONDITIONING AMPLIFIER

OK

2.CHECK AIR CONDITIONING AMPLIFIER

Measure the voltage of the connector.
Standard voltage:
Tester Connection
Condition
Specified Condition
e1-2 (BUSG) - e1-4 (BBUS)
Engine switch on (IG)
10 to 14 V
Engine switch off
Below 1 V

REPLACE AIR CONDITIONING AMPLIFIER

REPLACE AIR CONDITIONING HARNESS

Tester Connection	Condition	Specified Condition
e1-2 (BUSG) - Body ground	Always	Below 1 Ω

Tester Connection	Condition	Specified Condition
e1-2 (BUSG) - e1-4 (BBUS)	Engine switch on (IG)	10 to 14 V
e1-2 (BUSG) - e1-4 (BBUS)	Engine switch off	Below 1 V