DTC B2988 (P and Windshield Defrost)

DTC B2988 or DTC indicator P and WINDSHIELD DEFROST  : A Problem in the A/C Compressor Variable Capacity Control Solenoid Circuit

DTC (AC)

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   - 2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 3. Do the Self-Diagnostic Function with the HDS or the climate control unit.

   - 4. Wait for at least 1 minute.

   - 5. Check for DTCs.

   DTC Description	DTC
   B2988 A problem in the A/C compressor variable capacity control solenoid circuit

   Is DTC B2988 or P and WINDSHIELD DEFROST indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the A/C compressor variable capacity control solenoid circuit.

2. Open wire check (VDC SOL OUT/A/C SOL OUT line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connectors.

   Climate control unit connector A (32P)

   A/C compressor clutch 3P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	A/C compressor clutch 3P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 4 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	A/C compressor clutch 3P connector (female terminals) No. 2:

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VDC SOL OUT/A/C SOL OUT wire is not open. Go to step 3.

   NO 

   Repair an open in the wire between the climate control unit and the A/C compressor.

3. Open wire check (VDC SOL IN/A/C SOL IN line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	A/C compressor clutch 3P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 6 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	A/C compressor clutch 3P connector (female terminals) No. 3:

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VDC SOL IN/A/C SOL IN wire is not open. Go to step 4.

   NO 

   Repair an open in the wire between the climate control unit and the A/C compressor.

4. Shorted wire check (VDC SOL OUT line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	A/C compressor clutch 3P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 4 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire between the climate control unit and the A/C compressor.

   NO 

   The VDC SOL OUT wire is OK. Go to step 5.

5. Shorted wire check (VDC SOL IN line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	A/C compressor clutch 3P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 6 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire between the climate control unit and the A/C compressor.

   NO 

   The VDC SOL IN wire is OK. Go to step 6.

6. A/C compressor variable capacity control solenoid check

   - 1. Test the A/C compressor variable capacity control solenoid.

   Is the variable capacity control solenoid OK?

   YES 

   Replace the climate control unit .

   NO 

   Replace the A/C compressor .