DIAGNOSTIC ITEM 21: Diagnose when the scan tool cannot receive the data sent by A/C control panel < vehicles with A/C > or heater control panel < vehicles without A/C >: Diagnosis

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > for loose, corroded or damaged terminals, or terminals pushed back in the connector.
CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details, refer to SERVICE PRECAUTIONS .

Q: Are joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > in good condition?
1. YES: Go to Step 2.
2. NO: Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > for open circuit.
CAUTION: Strictly observe the specified wiring harness repair procedure. For details, refer to SERVICE PRECAUTIONS .
1. Disconnect joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C >, and check the wiring harness.
2. Check the wiring harness between joint connector (CAN1) C-06 (terminal 8) and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > (terminal 7)
  OK: Continuity exists (2 Ω or less)
  
  Fig 1: Checking Wiring Harness Between Joint Connector (CAN1) C-06 (Terminal 8) And Heater Control Panel Connector C-147 (Terminal 7)
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Check the wiring harness between joint connector (CAN1) C-06 (terminal 19) and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > (terminal 8)
  OK: Continuity exists (2 Ω or less)
Q: Is the wiring harness between joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C > in good condition?
1. YES: Check the power supply circuit of the A/C control panel < vehicles with A/C > or heater control panel < vehicles without A/C >. Refer to DIAGNOSTIC TROUBLE CODE CHART for Manual A/C and heater, or DIAGNOSTIC TROUBLE CODE CHART for Auto A/C.
2. NO: Repair the wiring harness between joint connector (CAN1) C-06 and A/C control panel connector C-146 < vehicles with A/C > or heater control panel connector C-147 < vehicles without A/C >.
  
  Fig 2: Checking Wiring Harness Between Joint Connector (CAN1) C-06 (Terminal 19) And Heater Control Panel Connector C-147 (Terminal 8)
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.