Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER

SYSTEM CHECK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

DTC B1497 Communication Malfunction (Bus Ic)

DESCRIPTION

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

DTC CodeDTC Detection ConditionTrouble Area
B1497An error or open in the communication line.
Air conditioning harness assembly
No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)
No. 1 blower damper servo sub-assembly
No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)
No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)
Air conditioning amplifier assembly

WIRING DIAGRAM

Dtc B1497 Communication Malfunction (Bus Ic). HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK FOR DTC

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
Go to step 2
A
USE SIMULATION METHOD TO CHECK ()
2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
Dtc B1497 Communication Malfunction (Bus Ic). HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the E81 air conditioning amplifier assembly connector.

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    E81-21 (+B1) - Body groundAlways11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

Select the Active Test, use the intelligent tester to generate a control command, and then check that items operate ().

Air Conditioner
Tester DisplayTest PartControl RangeDiagnostic Note
Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)Min.: 0, Max.: 255-
Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assemblyMin.: 0, Max.: 255-
Air Outlet Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)Min.: 0, Max.: 255-
Cool Air Bypass Pulse No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)Min.: 0, Max.: 255-
  • OK:
  • Arm of the damper servo motor selected in the Active Test moves smoothly.

According to the test result, proceed to the next step.

Result
ResultProceed to
One of the damper servo motors is malfunctioningA
All of the damper servo motors are malfunctioningB
B
Go to step 9
A
4.SYSTEM CHECK

According to the test result, proceed to the next step.

Result
ResultProceed to
Only the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) is malfunctioningA
Only the No. 1 blower damper servo sub-assembly is malfunctioningB
Only the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) is malfunctioningC
Only the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) is malfunctioningD
B
Go to step 6
C
Go to step 7
D
Go to step 8
A
5.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo).

for LHD: .
for RHD: .
  • HINT:
  • Since the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) with a new or normally functioning one and check that the condition returns to normal.

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
Go to step 9
A
END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] IS FAULTY)
6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

Temporarily replace the No. 1 blower damper servo sub-assembly ().

  • HINT:
  • Since the No. 1 blower damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the No. 1 blower damper servo sub-assembly with a new or normally functioning one and check that the condition returns to normal.

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
Go to step 9
A
END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY IS FAULTY)
7.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)

Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo).

for LHD: .
for RHD: .
  • HINT:
  • Since the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) with a new or normally functioning one and check that the condition returns to normal.

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
Go to step 9
A
END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)
8.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).

for LHD: .
for RHD: .
  • HINT:
  • Since the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) with a new or normally functioning one and check that the condition returns to normal.

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
Go to step 9
A
END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [COOLER BYPASS DAMPER SERVO] IS FAULTY)
9.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Temporarily replace the air conditioning harness assembly.

for LHD: .
for RHD: .
  • HINT:
  • Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or normally functioning one and check that the condition returns to normal.

Clear the DTC ().

Check for the DTC ().

Result
ResultProceed to
DTC B1497 is not outputA
DTC B1497 is outputB
B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
A
END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)
HEATING / AIR CONDITIONING
Land Cruiser URJ200 URJ202 GRJ200 VDJ200
AIR CONDITIONING SYSTEM for Manual Air Conditioning System