INSPECTION PROCEDURE 4: The outside air Temperature is not Displayed Normal.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991502: Scan Tool (MUT-II)

1. STEP 1. Check the communication and connection (M-BUS) of the service function. 
   1. Press the adjusting switch with the ignition switch at the "LOCK" (OFF) position. While holding the switch on the pressed condition, turn the ignition switch to "ACC" position.
   2. When the adjusting switch is continuously pressed for more than five seconds, the service function is activated at the same time with the reception signal sound (pip sound) and the service mode screen is displayed.
   3. Check the communication and connection FLOOR CONSOLE ASSEMBLY .

   Q: Isn't there any abnormality on the M-BUS? 

   1. YES:  Go to Step 2.
   2. NO:  Go to Step  Step 3
2. STEP 2. Check the communication and connection of the service function (SWS). 

   Q: Isn't there any abnormality on SWS? 

   1. YES:  the RV meter display should operate normally.
   2. NO:  Refer to SYMPTOM PROCEDURES .
3. STEP 3. Check the A/C-ECU. 
   CAUTION: To Prevent to damage to scan toll MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
   1. Connect scan tool MB991502 to the data link connector.
      Fig 1: Connecting Scan Tool To Data Link Connector

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   2. Turn the ignition switch to "ON" position.
   3. Read the A/C diagnostic trouble code.

   Q: Is A/C diagnostic trouble code 13 or 14 set? 

   1. YES:  Go to Step 4.
   2. NO:  Go to Step  Step 5
4. STEP 4. Check the outside air temperature sensor. 
   1. Remove the radiator grille. (Refer to ON-VEHICLE SERVICE .)
   2. Remove the outside air temperature sensor.
   3. Measure the resistance between the outside air temperature sensor terminals at two or more temperature conditions.
      Fig 2: Measuring Resistance Temperature Between Outside Air Temperature Sensor Graph

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   Q: Does the resistance value exist within the characteristic graph? 

   1. YES:  There is no action to be taken.
   2. NO:  Replace the outside air temperature sensor.
5. STEP 5. Check outside air temperature sensor connector A-29 and RV meter connector D-08 < vehicles with automatic air conditioning system > or RV meter connector D-07 < vehicles with manual air conditioning system > for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 3: Checking Outside Air Temperature Sensor Connector A-29

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   Fig 4: Checking RV Meter Connector D-08 (A/T) & D-07 (M/T)

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   Q: Are outside air temperature sensor connector A-29 and RV meter connector D-08 < vehicles with automatic air conditioning system > or RV meter connector D-07 < vehicles with manual air conditioning system > in good condition? 

   1. YES:  Go to Step 6 < vehicles with automatic air conditioning system > or go to  Step 8 < vehicles with manual air conditioning system >.
   2. NO:  Repair or replace them. Refer to FLOOR CONSOLE ASSEMBLY .
6. STEP 6. Check the RV meter and A/C-ECU < vehicles with automatic air conditioning system > circuit by backprobing. 
   1. Do not disconnect RV meter connector D-08.
   2. Ignition switch: "ACC" position.
   3. Measure the voltage (waveform) between the terminal 9 and the ground using an oscilloscope by backprobing.
      Fig 5: Measuring Voltage Between Terminal 9 & Ground

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   4. Measure the voltage (waveform) between terminal 10 and ground by backprobing.
      Fig 6: Measuring Voltage Between Terminal 10 & Ground

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   5. Measure the voltage (waveform) between terminal 19 and ground by backprobing.
      Fig 7: Measuring Voltage Between Terminal 19 & Ground

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   Q: Is the measured voltage Hi = 4 to 5 volts and Lo = 0 to 1 volt? 

   1. YES:  Replace the RV meter display.
   2. NO:  Go to Step 7.
7. STEP 7. Check the harness wires between RV meter connector D-08 (terminal 9 and 10 and 19) and A/C-ECU connector D-23 (terminal 16 and 17 and 6). 
   Fig 8: Checking RV Meter Connector D-08 & A/C-ECU Connector D-23

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   Q: Are harness wires between RV meter connector D-08 (terminal 9 and 10 and 19) and A/C-ECU connector D-23 (terminal 16 and 17 and 6) in good condition? 

   1. YES:  Go to Step  Step 9
   2. NO:  Repair or replace them. REAR SEAT ASSEMBLY .
8. STEP 8. Check the harness wires between RV meter connector D-07 (terminal 23 and 31) and outside air temperature sensor connector A-29 (terminal 1 and 2). 
   NOTE: After inspecting intermediate connector D-28 inspect the wires. If intermediate connector D-28 is damaged, repair or replace it.
   Fig 9: Checking Outside Air Temperature Sensor Connector A-29

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   Fig 10: Checking RV Meter Connector D-07 & Intermediate Connector D-28

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   Q: Are harness wires between RV meter connector D-07 (terminal 23 and 31) and outside air temperature sensor connector A-29 (terminal 1 and 2) in good condition? 

   1. YES:  Go to Step 9.
   2. NO:  Repair or replace them. Refer to REAR SEAT ASSEMBLY .
9. STEP 9. Recheck for malfunction. 

   Q: Is a malfunction eliminated? 

   1. YES:  If no malfunctions are not found in all steps, an intermittent malfunction is suspected.
   2. NO:  Replace the RV meter.