Climate Control Power and Ground Circuit Troubleshooting.

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Check the No. 3 (7.5A) fuse in the driver's under-dash fuse/relay box, and the No. 13 (7.5A) fuse in the passenger's under-dash fuse/relay box.
Are the fuses OK?
1. YES -
  - Without Navigation System: Go to step 2.
  - With Navigation System: Go to step 8 .
2. NO - Replace the fuse(s) and recheck.
Disconnect climate control unit connector A (8P).
Turn the ignition switch ON (II).
Measure the voltage between the No. 1 terminal of climate control unit connector A (8P) and body ground.

Fig 1: Measuring Voltage Between No. 1 Terminal Of Climate Control Unit Connector A (8P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 5.
2. NO - Repair open in the wire between the No. 3 fuse in the driver's under-dash fuse/relay box and the climate control unit.
Turn the ignition switch OFF.
Measure the voltage between the No. 2 terminal of climate control unit connector A (8P) and body ground.

Fig 2: Measuring Voltage Between No. 2 Terminal Of Climate Control Unit Connector A (8P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 7.
2. NO - Repair open in the wire between the No. 13 fuse in the passenger's under-dash fuse/relay box and the climate control unit.
Check for continuity between the No. 8 terminal of climate control unit connector A (8P) and body ground.

Fig 3: Checking Continuity Between No. 8 Terminal Of Climate Control Unit Connector A (8P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Check for loose wires or poor connections at climate control unit connector A (8P). If the connections are good substitute a known-good climate control unit and recheck. If the symptom/indication goes away replace the original climate control unit.
2. NO - Check for an open in the wire between the climate control unit and body ground. If the wire is OK check for poor ground at G401.
Disconnect climate control unit connector B (26P).
Turn the ignition switch ON (II).
Measure the voltage between the No. 13 terminal of climate control unit connector B (26P) and body ground.

Fig 4: Measuring Voltage Between No. 13 Terminal Of Climate Control Unit Connector B (26P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 11.
2. NO - Repair open in the wire between the No. 3 fuse in the driver's under-dash fuse/relay box and the climate control unit.
Turn the ignition switch OFF.
Check for continuity between the No. 15 terminal of climate control unit connector B (26P) and body ground.

Fig 5: Checking Continuity Between No. 15 Terminal Of Climate Control Unit Connector B (26P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Check for loose wires or poor connections at climate control unit connector B (26P) If the connections are good substitute a known-good climate control unit, and recheck If the symptom/indication goes away replace the original climate control unit.
2. NO - Check for an open in the wire between the climate control unit and body ground If the wire is OK check for poor ground at G401.