AIR CONDITIONING SYSTEM Air Conditioning Control Panel Circuit

DESCRIPTION

w/ Multi-display:

• A/C control panel switch signals are sent to the A/C amplifier via CAN communication.

w/o Multi-display:

• A/C control panel switch signals are sent to the accessory meter assembly via AVC-LAN communication.

  The accessory meter assembly then sends these signals to the A/C amplifier via LIN communication.

WIRING DIAGRAM

1. w/ Navigation System

   

2. w/ Audio and Visual System (w/ Multi-display)

   

3. w/ Audio and Visual System (w/o Multi-display)

   

INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM MODEL

   Result
   Result Proceed to w/ Multi-display A w/o Multi-display B

   
   

   B

   CHECK AVC-LAN CIRCUIT Click here

   A

2. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to CAN DTC is not output A CAN DTC is output B

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

3. CHECK AVC-LAN CIRCUIT

   
   

   1. Check for an open or short in all AVC-LAN circuits Click here (w/ Navigation System), Click here (w/ Audio and Visual System (w/ Multi-display)).

      OK
      There is no open or short circuit.

   
   

   NG

   REPAIR AVC-LAN CIRCUIT

   OK

4. CHECK HARNESS AND CONNECTOR (POWER SOURCE, GROUND)

   
   

   1. Disconnect the multi-media module receiver assembly (A/C control panel) connector.*1

   2. Disconnect the radio receiver assembly (A/C control panel) connectors.*2

   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition G36-15 (IG+) - G36-12 (GND1)*1 Engine switch off Below 1 V G36-15 (IG+) - G36-12 (GND1)*1 Engine switch on (IG) 11 to 14 V G36-16 (ACC1) - G36-12 (GND1)*1 Engine switch off Below 1 V G36-16 (ACC1) - G36-12 (GND1)*1 Engine switch on (ACC) 11 to 14 V G36-17 (+B1) - G36-12 (GND1)*1 Always 11 to 14 V G38-1 (IG) - G37-20 (GND1)*2 Engine switch off Below 1 V G38-1 (IG) - G37-20 (GND1)*2 Engine switch on (IG) 11 to 14 V G37-11 (ACC) - G37-20 (GND1)*2 Engine switch off Below 1 V G37-11 (ACC) - G37-20 (GND1)*2 Engine switch on (ACC) 11 to 14 V G37-1 (+B1) - G37-20 (GND1)*2 Always Always

      
      

      • *1: w/ Navigation System

      • *2: w/ Audio and Visual System (w/ Multi-display)

   4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition G36-12 (GND1) - Body ground*1 Always Below 1 Ω G37-20 (GND1) - Body ground*2 Always Below 1 Ω

      
      

      • *1: w/ Navigation System

      • *2: w/ Audio and Visual System (w/ Multi-display)

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

5. CHECK AVC-LAN CIRCUIT

   
   

   1. Check for an open or short in all AVC-LAN circuits Click here.

      OK
      There is no open or short circuit.

   
   

   NG

   REPAIR AVC-LAN CIRCUIT

   OK

6. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - ACCESSORY METER ASSEMBLY)

   
   

   1. Disconnect the A/C amplifier connector.

   2. Disconnect the accessory meter assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition F50-37 (LIN1) - G1-20 (LIN1) Always Below 1 Ω F50-37 (LIN1) - Body ground Always 10 k Ω or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. CHECK HARNESS AND CONNECTOR (POWER SOURCE, GROUND)

   
   

   1. Disconnect the radio receiver assembly (A/C control panel) connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition G7-1 (B) - Body ground Always 11 to 14 V G8-16 (ACC) - Body ground Engine switch off Below 1 V G8-16 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition G8-9 (GND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here