B and FRESH

HVAC DTC Troubleshooting: Indicator B and FRESH

DTC indicator B and FRESH: A Problem in the Auxiliary Electric Water Pump Connection

1. Do the self-diagnostic with the climate control unit. Initial Inspection and Diagnostic Overview

2. Check the DTCs.

Is DTC B and FRESH indicated?
YES - Go to step 3.

NO - Intermittent failure. Check for loose wires or poor connections on the auxiliary electric water pump circuit.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the auxiliary electric water pump 2P connector.

5. Disconnect climate control unit connector B (16P).

6. Check for continuity between climate control unit connector B (16P) terminal No. 4 and the auxiliary electric water pump 2P connector terminal No. 1.

Is there continuity?
YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. Climate Control Unit Removal/Installation

NO - Repair an open in the wire between the climate control unit and the auxiliary electric water pump.