Diagnosis Description
DIAGNOSIS SYSTEM (UNIFIED METER and A/C AMP.)
WITHOUT ACCS : Diagnosis Description
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunctions.
SELF-DIAGNOSIS FUNCTION
- The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to applicable sections (items) for details. Shifting from normal control to the self-diagnosis system is accomplished by starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The
OFF switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system is canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step is accomplished by means of turning temperature control dial (driver side), as required.
- Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing fan (UP: +) switch.
- Temperature setting trimmer. Refer to Temperature Setting Trimmer.
- Foot position setting trimmer. Refer to Foot Position Setting Trimmer.
- Inlet port memory function. Refer to Inlet Port Memory Function.
CONFORMATION METHOD
1.SET IN SELF-DIAGNOSIS MODE
1. Turn ignition switch ON.
2. Set in self-diagnosis mode as per the following. Press OFF switch for at least 5 seconds Within 10 seconds after starting engine (ignition switch is turned ON).
NOTE:
- If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a result, the system may generate an error even when operation is normal. Start engine before performing this diagnosis to avoid this.
- Former STEP-1 (indicators and display screen are checked) does not exist in this self-diagnosis function.
- OFF switch may not be recognized according to the timing of pressing it. Operate OFF switch after the intake switch indicators are turned ON.
- GO TO 2.
2.STEP-2: SENSOR AND DOOR MOTOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Does code No. 20 appear on the display?
YES - GO TO 3.
NO - GO TO 11.
3.STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn temperature control dial (driver side) clockwise.
Does code No. 30 appear on the display?
YES - GO TO 4.
NO - GO TO 12.
4.STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1. Turn temperature control dial (driver side) clockwise.
2. Press DEF ( ) switch. Code No. of each door motor test is indicated on the display.
- GO TO 5.
5.CHECK ACTUATORS
Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and compressor operation.
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper operation.
Is this inspection result normal?
YES - GO TO 6.
NO-1 - Air outlet does not change. Refer to Diagnosis Procedure.
NO-2 - Intake door does not change. Refer to Diagnosis Procedure.
NO-3 - Discharge air temperature (driver side) does not change. Refer to Diagnosis Procedure.
NO-4 - Discharge air temperature (passenger side) does not change. Refer to Diagnosis Procedure.
NO-5 - Blower motor operation is malfunctioning. Refer to Diagnosis Procedure.
NO-6 - Magnet clutch does not engage. Refer to Diagnosis Procedure.
6.STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Turn temperature control dial (driver side) clockwise.
2. Code No. 51 appears on the display.
- GO TO 7.
7.CHECK AMBIENT SENSOR
Press DEF ( ) switch one time. Temperature detected by ambient sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES - GO TO 8.
NO - Go to Ambient Sensor Circuit. Refer to Diagnosis Procedure.
8.CHECK IN-VEHICLE SENSOR
Press DEF ( ) switch for the second time. Temperature detected by in-vehicle sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES - GO TO 9.
NO - Go to In-vehicle Sensor Circuit. Refer to Diagnosis Procedure.
9.CHECK INTAKE SENSOR
Press DEF ( ) switch for the third time. Temperature detected by intake sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?
YES - GO TO 10.
NO - Go to Intake Sensor Circuit. Refer to Diagnosis Procedure.
10.CHECK CAN COMMUNICATION ERROR
1. Press intake switch.
2. CAN communication error between each unit that uses the unified meter and A/C amp. can be detected as self-diagnosis results. (The display of each error will blink twice for 0.5 second intervals if plural errors occur.)
Is the inspection result normal?
YES - INSPECTION END
NO - Go to CAN communication (Unified meter and A/C amp.
� AV control unit). Refer to CAN COMM Circuit.
11.CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR
Refer to the following chart for malfunctioning code No.
(Corresponding code Nos. indicates 1 second each if two or more sensors and door motors malfunction.)
(Corresponding code Nos. indicates 0.5 second each if two door motors malfunction.)
*: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 indicates despite that sunload sensor is functioning normally.
- INSPECTION END
12.CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode and/or intake door motor PBR(s) is/are malfunctioning.
(Corresponding code Nos. indicates 1 second each if two or more mode or intake door motors malfunction.)
*1: The following display pattern will appear if mode door motor harness connector is disconnected.
31 to32 to Return to 31
*2: The following display pattern will appear if intake door motor harness connector is disconnected.
37 to38 to39 to Return to 37
- INSPECTION END