Dtc B1497/97 Bus Ic Communication Malfunction

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK AIR CONDITIONING AMPLIFIER

INSPECT AIR CONDITIONING AMPLIFIER

DTC B1497/97 BUS IC Communication Malfunction


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
B1497/97
Communication line error or open
  1. Air conditioning harness
  2. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497/97 Bus Ic Communication Malfunction


INSPECTION PROCEDURE

1.CHECK AIR CONDITIONING AMPLIFIER
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497/97 Bus Ic Communication Malfunction

  1. Remove the air conditioning amplifier with its connectors still connected.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    c1-2 (BUS G) - Body ground
    		Below 1 Ω


NG
CHECK GROUND LINE AND AIR CONDITIONING AMPLIFIER
OK


2.INSPECT AIR CONDITIONING AMPLIFIER
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497/97 Bus Ic Communication Malfunction

  1. Remove the air conditioning amplifier with its connectors still connected.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    c1-2 (BUS G) - c1-4 (B BUS)
    		Ignition switch on (IG)
    		11 to 13 V
    c1-2 (BUS G) - c1-3 (BUS)
    		Ignition switch on (IG)
    		Pulse generation


NG
REPLACE AIR CONDITIONING AMPLIFIER
OK

REPLACE AIR CONDITIONING HARNESS ASSEMBLY