DTC B2966

DTC B2966  : Climate control unit lost communication with Rear PANEL

DTCs (AC)

1. Problem verification

   -1. Clear the DTC with the HDS.

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

   -3. Wait for at least 6 seconds.

   -4. Do the Self-Diagnostic Function with the HDS or the climate control unit .

   -5. Check for DTCs.

   DTC Description	DTC
   B2966 Climate control unit lost communication with Rear PANEL

   Is DTC B2966 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the rear control panel circuit.

2. Open wire check (IG2 A/C line)

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

   -2. Disconnect the following connector.

   Rear control panel 12P connector

   -3. Turn the vehicle to the ON mode.

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Rear control panel 12P connector: disconnected
   Test point 1	Rear control panel 12P connector (female terminals) No. 4:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG2 A/C wire is OK. Go to step 3.

   NO 

   Repair an open in the wire between the No. C23 (7.5 A) fuse in the under-dash fuse/relay box and the rear control panel.

3. Open wire check (GND line)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Rear control panel 12P connector: disconnected
   Test point 1	Rear control panel 12P connector (female terminals) No. 5:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 4.

   NO 

   Check for an open in the wire between the rear control panel and body ground. If the wire is OK, check for poor ground at G603.

4. Open wire check (LIN AC line)

   -1. Disconnect the following connector.

   Climate control unit connector A (32P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Rear control panel 12P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 22
   Test point 2	Rear control panel 12P connector (female terminals) No. 1:

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

   Is there continuity?

   YES 

   The LIN AC wire is OK. Go to step 5.

   NO 

   Repair an open in the wire between the climate control unit and the rear control panel.

5. Shorted wire check (LIN AC line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Rear control panel 12P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 22
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the wire between the climate control unit and the rear control panel.

   NO 

   Replace the rear control panel .