DTC B2965: Climate Control Unit Lost Communication With Rear Climate Control Panel

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0), and then ON (II).
Do the self-diagnostic with the HDS (see HOW TO USE THE HDS TO CHECK FOR DTCS ).
Check for DTCs.
Is DTC B2965 indicated?

YES - Go to step 5.

NO - Intermittent failure, check for loose wires or poor connections on the rear climate control panel and climate control unit circuit. ■
Turn the ignition switch to LOCK (0).
Disconnect the rear climate control panel 12P connector.
Turn the ignition switch to ON (II).
Measure the voltage between rear climate control panel 12P connector terminal No. 12 and body ground.
Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire between the No. 36 (10A) fuse in the under-dash fuse/relay box and the rear climate control panel. ■

Fig 1: Measuring Voltage Between Rear Climate Control Panel 12P Connector Terminal No. 12 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Check for continuity between rear climate control panel 12P connector terminal No. 9 and body ground.
Is there continuity?

YES - Go to step 11.

NO - Check for an open in the wire between the rear climate control panel and body ground. If the wire is OK, check for poor ground at G801 (see GROUND TO COMPONENTS INDEX ). ■

Fig 2: Checking Continuity Between Rear Climate Control Panel 12P Connector Terminal No. 9 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect climate control unit connector B (20P).
Check for continuity between the following terminals of climate control unit connector B (20P) terminal No. 3 and rear climate control panel 12P connector terminal No. 5.
Is there continuity?

YES - Go to step 13.

NO - Repair open in the wire(s) between the climate control unit and the rear climate control panel. ■

Fig 3: Checking Continuity Between Terminals Of Climate Control Unit Connector B (20P) & Rear Climate Control Panel 12P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and climate control unit connector B (20P) terminal No. 3.
Is there continuity?

YES - Repair short to body ground in the wire(s) between the climate control unit and the rear climate control panel. ■

NO - Substitute a known-good rear climate control panel, and recheck. If the symptom/indication goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ) ■

Fig 4: Checking Continuity Between Body Ground & Climate Control Unit Connector B (20P) Terminal No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.