PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 START INSPECTIONS. Perform pre-inspection. Perform self-diagnosis. Refer to OPERATION . | Dose self-diagnosis operate? | Go to step 2. | Refer to A/C AND/OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE . |
| 2 CHECK DTC. Check DTC. | Is DTC indicated? | Refer to DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 3. |
| 3 CHECK BLOWER MOTOR OPERATION. Turn blower switch ON. Check blower motor operation. | Is blower motor rotated? | Go to step 4. | Refer to BLOWER MOTOR DOES NOT ROTATE . |
| 4 CHECK FRESH/RECIRC MODE. Change FRESH/RECIRC mode by pushing mode switch. | Is FRESH/RECIRC mode changed? | Go to step 5. | Refer to FRESH/RECIRC DOES NOT CHANGE . |
| 5 CHECK COMPARTMENT TEMPERATURE. Turn A/C switch ON. Set temperature at 18°C (65°F) (MAX COOL). Check compartment temperature changes. | Is the compartment temperature changed? | Go to step 6. | Refer to COMPARTMENT TEMPERATURE DOES NOT CHANGE FROM "SET" TEMPERATURE OR AIR CONDITIONING SYSTEM DOES NOT RESPOND QUICKLY . > |
| 6 CHECK A/C SYSTEM RESPONSE. Change the temperature setting, and check response of A/C system. | Dose A/C system respond quickly? | A/C system is OK. | Refer to COMPARTMENT TEMPERATURE DOES NOT CHANGE FROM "SET" TEMPERATURE OR AIR CONDITIONING SYSTEM DOES NOT RESPOND QUICKLY . |
BASIC DIAGNOSTIC PROCEDURE CHART
CAUTION
- Never connect the battery in reverse polarity. The auto A/C control module may be destroyed instantly.
- Do not disconnect the battery terminals while the engine is running. A large counter electromotive force will be generated in the alternator, and this voltage may damage electronic parts such as A/C control module.
- Before disconnecting the connectors of each sensor and the A/C control module, be sure to turn off the ignition switch. Otherwise, the Auto A/C control module may be damaged.
- Every auto A/C-related part is a precision part. Do not drop them.
- Airbag system wiring harness is routed near the A/C control panel (A/C control module) and junction box.
| CAUTION | All airbag system wiring harness and connectors are colored yellow. Do not use electrical test equipment on these circuits. Be careful not to damage Airbag system wiring harness when servicing the A/C control panel (A/C control module) and junction box. |
REFRIGERANT LINE
Check contact for refrigerant line (A).
Scheme 14
Scheme 15
- Check state of mode door control rod and linkage.
- Check state of air mix door control rod and linkage.
- Check state of intake door control rod and linkage.
CONTROL SWITCHES
Start and warm up engine completely.
- Inspection using switches. CONTROL SWITCHES SPECIFICATION CHART No. Point to check Switch operation Judgement standard 1 OFF switch OFF switch "ON" "SET" temperature display go out. Air flow --> OFF Outlet --> HEAT Inlet --> FRESH Compressor --> OFF 2 AUTO switch AUTO switch "ON" Temp control dial 18°C (65°F) (Max. Cold) AUTO switch display illuminates. or Outlet air --> Cool Air flow --> HI (AUTO) Outlet --> VENT Inlet --> AUTO Compressor --> AUTO C. TEMP control dial is gradually set from 18°C (65°F) to 32°C (85°F). c. Air and air outlet mode change as follows: Outlet air: cool --> hot Air flow: AUTO Outlet: VENT --> BI-LEVEL --> HEAT Inlet: AUTO D. Temp, control dial 32°C (85°F) (Max. Hot) d. Outlet air --> Hot Airflow --> HI (AUTO) Outlets --> HEAT Inlet --> FRESH (AUTO) Compressor --> AUTO 3 DEF switch DEF switch "ON" Temp, control dial 18 - 32°C (65 - 85°F) DEF switch display illuminates. or Outlet air temperature (AUTO control) Air flow (AUTO control) Outlet --> DEF Inlet --> FRESH Compressor --> ON 4 FRESH/RECIRC switch FRESH/RECIRC switch "ON" Changes from RECIRC --> FRESH, or FRESH --> RECIRC. 5 MODE switch MODE switch "ON" Outlet changes from VENT --> BI-LEVEL --> HEAT --> DEF/HEAT each time MODE switch is pushed. 6 FAN switch FAN switch "ON" Fan speed changes from LO --> M1 --> M2 --> HI each time FAN switch is pushed. 7 OUT-TEMP switch OUT-TEMP switch "ON" Ambient temperature flashes on "set" temperature display, and "set" temperature appears.
- Compressor operation inspection COMPRESSOR OPERATION CHART No. Point to check Switch operation Judgement standard Remarks 1 Compressor AUTO switch "ON" A/C switch "ON" DEF switch "ON" Compressor ON Compressor ON Compressor ON Compressor turns OFF several seconds after AUTO switch is turned ON.
- Illumination control inspection ILLUMINATION CONTROL CHART No. Point to check Switch operation Judgement standard Remarks 1 Illumination Lighting switch "ON" Illumination light illuminates and both switch light and "set" temperature display dim. Green lights remain on although OFF and OUT-TEMP switches remain ON. Press OFF switch longer than 1 second. Dimming of illumination is canceled.
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| Content | Connector & Terminal No. | Signal (V) |
|---|---|---|
| BATT voltage (Memory back-up) | B1-b12 | BATT voltage, 13 - 14 (engine running) |
| ON power supply | A8-b12 | Battery voltage (ignition switch ON), 13 - 14 (engine running) |
| ACC power supply (OFF: ignition in START or diagnosis system reset) | B2-b12 | BATT voltage, 0 (engine cranking), BATT voltage (during engine starts) |
| A/C control module ground circuit | B12-body ground | 0 (ignition switch ON) - circuit constantly grounded |
| Sensor ground circuit | B17-body ground | 0 (ignition switch ON) - circuit constantly grounded |
| Ambient sensor | B6-b17 | Approx. 3.3 (disconnect connector, and ignition switch ON) |
| Evaporator sensor | B7-b17 | |
| Thermometer | B15-b12 | |
| Sunload sensor | B16-b17 | Approx. 4.2 (disconnect connector, and ignition switch ON) |
| Air mix door actuator | A4-a3 | BATT voltage (AUTO mode) positive "+" at terminal "a4" and negative "-" at "a3" [temperature set at 18°C (65°F)]; negative "-" at terminal "a4" and positive "+" at "a3" [temperature set at 32°C (90°F)] |
| Air mix door actuator P.B.R. | A12-b17 | Approx. 0.5 [temperature set at 18°C (65°F) in AUTO mode] Approx. 4.5 [temperature set at 32°C (90°F) in AUTO mode] |
| Mode actuator VENT | A5-b17 | BATT voltage (ignition switch ON in MANUAL mode); positive "+" at terminal "a5" and negative "-" at "b17" (VENT); negative "-" at "a5" and positive "+" at "b17" (DEF) |
| Mode actuator DEF | A6-b17 | BATT voltage (ignition switch ON in MANUAL mode) Approx. 4.5 (VENT); approx. 0.5 (DEF) |
| Intake door actuator FRS voltage | A7-a15 | BATT voltage (CIRC switch OFF) |
| Intake door actuator CIRC voltage | A15-a7 | BATT voltage (CIRC switch ON) |
| Blower fan relay | B14-body ground | BATT voltage (ignition switch ON) |
| A/C relay | B3-b12 | 0 (ignition and A/C switches ON) BATT voltage (A/C switch OFF) |
| Termination control signal | B10-b20 | BATT voltage (ignition and lighting switches ON) |
| Rear defogger | A13-b12 | 0 (IGN ON, R Def SW ON) |
CONNECTOR SPECIFICATION CHART
OPERATING MODE TABLE
| Mode display | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 |
|---|---|---|---|---|---|---|---|---|
| Air inlet | REC | REC | REC | FRE | FRE | FRE | FRE | FRE |
| Air outlet | VENT | VENT | B/L | B/L | B/L | HEAT | D/H | DEF |
| Air mix door | FULL COOL | FULL COOL | FULL COOL | FULL HOT | FULL HOT | FULL HOT | FULL HOT | FULL HOT |
| Blower fan | 5V | 5V | Power supply voltage | 8.5V | 8.5V | 8.5V | 8.5V | Power supply voltage |
| A/C compressor | ON | ON | ON | OFF | OFF | OFF | ON | ON |
HVAC SYSTEM (AUTO A/C) (DIAGNOSTIC) CHART