DTC    B1497/97    BUS IC Communication Malfunction

for Preparation Click here


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


E120475E02


INSPECTION PROCEDURE

1.INSPECT AIR CONDITIONING AMPLIFIER (GROUND LINE)
E115956E10

  1. Remove the air conditioning amplifier with its connectors still connected (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z1-2 (BUS G) - Body ground
    		Always
    		Below 1 Ω

  1. Reinstall the air conditioning amplifier.
    Text in Illustration 
    *1
    		Component with harness connected
    (Air Conditioning Amplifier)



NG
REPLACE AIR CONDITIONING AMPLIFIER (Click here)
OK


2.INSPECT AIR CONDITIONING AMPLIFIER
E115956E11

  1. Remove the air conditioning amplifier with its connectors still connected (Click here).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    z1-4 (B BUS ) - z1-2 ( BUS G)
    		Always
    		11 to 14 V
    z1-3 (BUS) - z1-2 (BUS G)
    		Ignition switch ON
    		Pulse generation

  1. Reinstall the air conditioning amplifier.
    Text in Illustration 
    *1
    		Component with harness connected
    (Air Conditioning Amplifier)



NG
REPLACE AIR CONDITIONING AMPLIFIER (Click here)
OK

REPLACE AIR CONDITIONING HARNESS (Click here)