| DTC Code | DTC Name |
|---|---|
| B1487 | Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow) |
DESCRIPTION
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*1: for LHD
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*2: for RHD
The heater air damper assembly (MODE FACE (rear RH))*1 or heater air damper assembly (MODE FACE (rear LH))*2 sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the heater air damper assembly (MODE FACE (rear RH))*1 or heater air damper assembly (MODE FACE (rear LH))*2 to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B1487 | Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow) |
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|
Memorized |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | During heater air damper assembly (MODE FACE (rear RH) operation | ○ | ○ |
| Malfunction Status | The damper servo operation request signal is output but the position information of the servo does not change | ○ | - |
| The damper servo operation request signal is output but the position information of the servo is malfunctioning | - | ○ | |
| Detection Time | Continuously for 30 seconds or more | Continuously for 30 seconds or more | |
| Trip Count | 1 trip | 1 trip | |
If the conditions match either of these patterns, a DTC will be output.
CAUTION / NOTICE / HINT
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Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or the damper is mechanically locked.
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When installing the damper servo motor, make sure to install it correctly.
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When the servo motor is replaced, be sure to perform servo motor initialization.
Confirm that no mechanical problem is present because this DTC can be output when either a damper link or damper is mechanically locked.
PROCEDURE
- Click here
CHECK FOR DTC
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Check for DTCs.
- Body Electrical > Air Conditioner > Trouble Codes
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Result Result Proceed to DTC B1487 is output A DTC B1487 and B1497 are output. B
- AClick here
- B
GO TO DTC B1497Click here
-
- Click here
CHECK HEATER AIR DAMPER ASSEMBLY
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Check for heater air damper assembly is installed correctly.
OK Heater air damper servo assembly is installed correctly. Result Proceed to OK NG
- OKClick here
- NG
REINSTALL HEATER AIR DAMPER ASSEMBLYClick here
-
- Click here
CHECK HEATER AIR DAMPER ASSEMBLY (MOTOR, LINK, DAMPER)
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Check for a wire harness caught between the links of the motors and dampers.
OK No wire harnesses are caught between the links of the motors and dampers. Result Proceed to OK NG
- OKClick here
- NG
REMOVE PINCHED WIRE HARNESS
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- Click here
CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)
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Remove the heater air damper assembly.
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Operate the dampers by hand.
OK The dampers are easily operated by hand. Result Proceed to OK NG
- OKClick here
- NG
REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY
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- Click here
PERFORM ACTIVE TEST USING GTS (A/O SERVO PULSE (F&R P))
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*1: for LHD
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*2: for RHD
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*3: Actually operates the heater air damper assembly (MODE FACE (rear RH))*1 or heater air damper assembly (MODE FACE (rear LH))*2.
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Remove the heater air damper assembly.
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Connect the heater air damper assembly (MODE FACE (rear RH))*1 or heater air damper assembly (MODE FACE (rear LH))*2 connector to heater air damper assembly (MODE FACE (rear LH)).
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Connect the GTS to the DLC3.
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Turn the power switch on (IG).
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Turn the GTS on.
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Enter the following menus: Body Electrical / Air Conditioner / Active Test.
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Check the operation by referring to the table below.
- Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Restrict Condition A/O Servo Pulse(F&R D)
- for LHD:
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Heater air damper servo assembly (MODE FACE (rear LH)) operation*3
- for RHD:
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Heater air damper servo assembly (MODE FACE (rear RH)) operation*3
Min.: 128
Max.: 383
- for LHD:
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Operates between 234 and 263 pulses
- for RHD:
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Operates between 249 and 278 pulses
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- Body Electrical > Air Conditioner > Active Test
Tester Display A/O Servo Pulse(F&R D) -
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OK Heater air damper assembly (FACE MODE (rear RH))*1 or heater air damper assembly (FACE MODE (rear LH))*2 is operated. Result Proceed to OK NG - Body Electrical > Air Conditioner > Active Test
- OK
REPLACE AIR CONDITIONING HARNESS ASSEMBLYClick here
- NGClick here
-
- Click here
CHECK HEATER AIR DAMPER ASSEMBLY
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Interchange the MODE FACE (rear RH) servo motor with MODE FACE (rear LH) servo motor and connect the connectors to them.
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Clear the DTCs.
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Check for DTCs.
Result Result Proceed to DTC B1486 is output A DTC B1487 is output B DTCs are not output C Tip:Codes other than DTC B1486 and B1487 may be output at this time, but they are not related to this check.
- A
REPLACE HEATER AIR DAMPER ASSEMBLYClick here
- B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here
- C
USE SIMULATION METHOD TO CHECKClick here
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