DESCRIPTION
The air conditioning harness connects the air conditioning amplifier and each
servo motor. The air conditioning amplifier supplies power and sends operation instructions
to each servo motor through the air conditioning harness. Each servo motor sends
the damper position information to the air conditioning amplifier.
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DTC Code
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DTC Detection Condition
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Trouble Area
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B1497/97
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Communication line error or open
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- Air conditioning harness
- No. 1 damper servo sub-assembly (air mix servo motor)
- No. 1 damper servo sub-assembly (air outlet servo motor)
- Air inlet servo motor
- Air conditioning amplifier
- Harness or connector
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following
inspection procedure.
PROCEDURE
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1.
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PERFORM ACTIVE TEST USING TECHSTREAM
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(a) Select the Active Test, using the Techstream to generate a control command,
and then check that the servo motor operates.
Air Conditioner
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Tester Display
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Test Part
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Control Range
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Diagnostic Note
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Air Mix Servo Targ Pulse (D)
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No. 1 damper servo sub-assembly (air mix servo motor) pulse
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Min.: 5, Max.: 104
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-
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Air Outlet Servo Pulse (D)
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No. 1 damper servo sub-assembly (air outlet servo motor) pulse
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Min.: 9, Max.: 97
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-
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Air Inlet Damper Targ Pulse
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Air inlet damper target pulse
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Min.: 7, Max.: 28
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-
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OK:
Arm of the servo motor selected in the Active Test moves smoothly
Result
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Result
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Proceed to
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One of the servo motors is malfunctioning
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A
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All of the servo motor are malfunctioning
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B
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| B |
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GO TO STEP 6
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| A |
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(a) According to the test, proceed to the next step.
Result
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Result
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Proceed to
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Only the No. 1 damper servo sub-assembly (air mix servo motor) is malfunctioning
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A
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Only the No. 1 damper servo sub-assembly (air outlet servo motor) is
malfunctioning
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B
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Only the air inlet control servo motor is malfunctioning
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C
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| B |
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GO TO STEP 4
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| C |
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GO TO STEP 5
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| A |
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3.
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CHECK NO. 1 DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR)
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(a) Replace the No. 1 damper servo sub-assembly (air mix servo motor) (See page
 ).
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 DTC (See page ).
Result
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Result
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Proceed to
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DTC B1497/97 is not output
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A
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DTC B1497/97 is output
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B
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| A |
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END (NO. 1 DAMPER SERVO SUB-ASSEMBLY [AIR MIX SERVO MOTOR] IS DEFECTIVE)
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| B |
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GO TO STEP 6
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4.
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CHECK NO. 1 DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET SERVO MOTOR)
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(a) Replace the No. 1 damper servo sub-assembly (air outlet servo motor) (See
page ).
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 DTC (See page ).
Result
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Result
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Proceed to
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DTC B1497/97 is not output
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A
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DTC B1497/97 is output
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B
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| A |
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END (NO. 1 DAMPER SERVO SUB-ASSEMBLY [AIR OUTLET SERVO MOTOR] IS DEFECTIVE)
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| B |
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GO TO STEP 6
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5.
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CHECK AIR INLET SERVO MOTOR
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(a) Replace the air inlet servo motor (See page ).
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 DTC (See page ).
Result
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Result
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Proceed to
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DTC B1497/97 is not output
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A
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DTC B1497/97 is output
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B
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| A |
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END (AIR INLET SERVO MOTOR IS DEFECTIVE)
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| B |
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6.
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CHECK AIR CONDITIONING HARNESS
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(a) Replace the air conditioning harness.
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 DTC (See page ).
Result
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Result
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Proceed to
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DTC B1497/97 is not output
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A
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DTC B1497/97 is output
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B
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| A |
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END (AIR CONDITIONING HARNESS IS DEFECTIVE)
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| B |
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|
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7.
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CHECK HARNESS AND CONNECTOR (POWER SOURCE)
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(a) Disconnect the J19 air conditioning amplifier connector.
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(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
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Tester Connection
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Condition
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Specified Condition
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J19-21 (B) - Body ground
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Always
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11 to 14 V
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| OK |
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REPLACE AIR CONDITIONING AMPLIFIER
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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