DTC B1220 (56): A Short in the Recirculation Control Motor Circuit

NOTE:  If other short circuit DTCs are indicated at the same time, there may be an open or short to body ground in the power (5 V) circuit.

• 1. Problem verification:

  1. Clear the DTC 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 - Refer to: How to Troubleshoot the Body ElectricalHow to Troubleshoot the Climate Control System .

  4. Check for DTCs.

  DTC Description	DTC
  B1220 A short in the recirculation control motor circuit

  Is DTC B1220 or 56 indicated?

  YES 

  Go to step 2.

  NO 

  Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.

• 2. Determine possible failure area (SENSOR 5V/S5V line, others):

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

  2. Disconnect the following connector.

  Recirculation control motor 7P connector

  3. Turn the vehicle to the ON mode.

  4. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Recirculation control motor 7P connector: disconnected
  Test point 1	Recirculation control motor 7P connector No. 3
  Test point 2	Body ground

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

  Is there about 5 V?

  YES 

  The SENSOR 5V/S5V wire is OK. Go to step 3.

  NO 

  Go to step 4.

• 3. Determine possible failure area (recirculation control motor, others):

  1. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Recirculation control motor 7P connector: disconnected
  Test point 1	Recirculation control motor 7P connector No. 2
  Test point 2	Body ground

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

  Is there about 5 V?

  YES 

  Replace the recirculation control motor .

  NO 

  Go to step 6.

• 4. Open wire check (SENSOR 5V/S5V line):

  1. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Recirculation control motor 7P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 17
  Test point 2	Body ground

  Is there about 5 V?

  YES 

  Repair an open in the wire between the climate control unit and the recirculation control motor.

  NO 

  Go to step 5.

• 5. Shorted wire check (SENSOR 5V/S5V line):

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

  2. Disconnect the following connector.

  Climate control unit 32P connector

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

  Test condition	Vehicle OFF (LOCK) mode
  	Climate control unit 32P connector: disconnected
  	Recirculation control motor 7P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 17
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short in the wire between the climate control unit and the recirculation control motor.

  NO 

  The SENSOR 5V/S5V wire is OK. Replace the climate control unit .

• 6. Shorted wire check (RFD-P/FRD-P line):

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

  2. Disconnect the following connector.

  Climate control unit 32P connector

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

  Test condition	Vehicle OFF (LOCK) mode
  	Climate control unit 32P connector: disconnected
  	Recirculation control motor 7P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 6
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short in the wire between the climate control unit and the recirculation control motor.

  NO 

  The RFD-P/FRD-P wire is OK. Replace the climate control unit .