B2995
DTC B2995 or DTC indicator A and FRESH: A Problem in the Auxiliary Electric Water Pump Circuit1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF, and then ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.
Is DTC B2995 or A and FRESH indicated?
YES - Go to step 5.
NO - Intermittent failure, check for loose wires or poor connections on the auxiliary electric water pump circuit.
5. Check the No. 22 (7.5 A) fuse in the under-hood fuse/relay box and the No. 36 (10 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 6.
NO - Replace the fuses, and recheck. If the fuse blows again, check for a short in the No. 22 (7.5 A) or No. 36 (10 A) fuse circuit.
6. Turn the ignition switch OFF.
7. Remove the auxiliary electric water pump relay from the auxiliary under-hood fuse/relay box, and test it.
Is the relay OK?
YES - Go to step 8.
NO - Replace the auxiliary electric water pump relay.
8. Measure the voltage between the auxiliary electric water pump relay 4P socket terminal No. 1 and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair open in the wire between the No. 22 (7.5 A) fuse in the under-hood fuse/relay box and the auxiliary electric water pump relay.
9. Turn the ignition switch ON (II).
10. Measure the voltage between the auxiliary electric water pump relay 4P socket terminal No. 4 and body ground.
Is there battery voltage?
YES - Go to step 11.
NO - Repair open in the wire between the No. 36 (10 A) fuse in the under-dash fuse/relay box and the auxiliary electric water pump relay.
11. Turn the ignition switch OFF.
12. Disconnect the auxiliary electric water pump2P connector.
13. Check for continuity between the auxiliary electric water pump relay 4P socket terminal No. 2 and the auxiliary electric water pump 2P connector terminal No. 1.
Is there continuity?
YES - Go to step 14.
NO - Repair open in the wire between the auxiliary electric water pump relay and the auxiliary electric water pump.
14. Check for continuity between the auxiliary electric water pump 2P connector terminal No. 2 and body ground.
Is there continuity?
YES - Go to step 15.
NO - Check for an open in the wire between the auxiliary electric water pump and body ground. If the wire is OK, check for poor ground at G301.
15. Reinstall the auxiliary electric water pump relay.
16. Disconnect climate control unit connector B (16P).
17. Turn the ignition switch ON (II).
18. Measure the voltage between climate control unit connector B (16P) terminal No. 9 and body ground.
Is there battery voltage?
YES - Go to step 19.
NO - Repair open in the wire between the auxiliary electric water pump relay and the climate control unit.
19. Turn the ignition switch OFF.
20. Check for continuity between climate control unit connector B (16P) terminal No. 4 and the auxiliary electric water pump relay 4P socket terminal No. 2.
Is there continuity?
YES - Go to step 21.
NO - Repair an open in the wires to auxiliary electric water pump feed back line.
21. Reconnect the auxiliary electric water pump 2P connector.
22. Reconnect climate control unit connector B (16P).
23. Run the auxiliary electric water pump by selecting the CLIMATE CONTROL SELF TEST Menu from the HDS.
24. Listen to the auxiliary electric water pump by touching it with a flat-tip screwdriver or a stethoscope.
Can you hear the pump running?
YES - Substitute a known-good climate control, and recheck. If the symptom/indication goes away, replace the original climate control unit.
NO - Replace the auxiliary electric water pump.