Air Conditioning System (for Manual Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1497/97: BUS IC Communication Malfunction
B1497/97 - BUS IC Communication Malfunction

DESCRIPTION

for Front Side:

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.

for Rear Side (w/ Rear Air Conditioning System):

The rear 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.





* *1: w/ Rear Air Conditioning System

WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on (IG) and turn the Techstream main switch on.

(c) Check the operation by referring to the table below.

Active Test / Air Conditioner





*1: w/ Rear Air Conditioning

OK:

Arm of the damper servo motor selected in the Active Test moves smoothly

(d) According to the test, proceed to the next step.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

C -- SYSTEM CHECK

D -- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING HARNESS)
A -- Continue to next step.

2. SYSTEM CHECK

(a) According to the test, proceed to the next step.

Result:





B -- REPLACE AIR INLET CONTROL SERVO MOTOR

C -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
A -- Continue to next step.

3. REPLACE AIR MIX CONTROL SERVO MOTOR

(a) Replace the air mix control servo motor Removal.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

4. REPLACE AIR INLET CONTROL SERVO MOTOR

(a) Replace the air inlet control servo motor Removal.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

5. REPLACE AIR OUTLET CONTROL SERVO MOTOR

(a) Replace the air outlet control servo motor Removal.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

6. REPLACE AIR CONDITIONING HARNESS

(a) Replace the air conditioning harness Disassembly.

HINT
Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)

A -- END

7. SYSTEM CHECK

(a) According to the test, proceed to the next step.

Result:





B -- REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR
A -- Continue to next step.

8. REPLACE REAR AIR MIX CONTROL SERVO MOTOR

(a) Replace the rear air mix control servo motor Removal.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING HARNESS)

A -- END

9. REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR

(a) Replace the air outlet control servo motor Removal.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING HARNESS)

A -- END

10. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING HARNESS)

(a) Disconnect the rear air conditioning harness connector.





(b) Disconnect the air conditioning amplifier connector.

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

Standard Resistance:





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

11. REPLACE REAR AIR CONDITIONING HARNESS

(a) Replace the rear air conditioning harness Disassembly.

HINT
Since the rear air conditioning harness cannot be inspected while it is removed from the vehicle, replace the rear air conditioning harness with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)

A -- END

12. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the air conditioning amplifier connector.





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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal