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Home >> Honda >> 2003 >> Odyssey EX-L >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control Systems >> A/C Pressure Switch Circuit Troubleshooting.

A/C Pressure Switch Circuit Troubleshooting.

NOTE:
  • Do not use this troubleshooting procedure if any of the following items are operative; condenser fan radiator fan A/C compressor or if the heater is inoperative. Refer to the symptom troubleshooting index.
  • Before performing symptom troubleshooting check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Disconnect the A/C pressure switch 4P connector.
  2. Turn the ignition switch ON (II).
  3. Measure the voltage between the No. 1 terminal of the A/C pressure switch 4P connector and body ground.
    Fig 1: Measuring Voltage Between No. 1 Terminal Of A/C Pressure Switch 4P Connector & Body Ground
    G01520122Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 4.
    2. NO  - Repair open in the wire between the A/C diode A, the PCM and the A/C pressure switch.
  4. Turn the ignition switch OFF.
  5. Check for continuity between the No. 1 and No. 4 terminals of the A/C pressure switch.
    Fig 2: Checking Continuity Between No. 1 & No. 4 Terminals Of A/C Pressure Switch
    G01520123Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 6.
    2. NO  - Go to step  13 .
  6. Reconnect the A/C pressure switch 4P connector.

    Does the vehicle have a Navigation System? 

    1. YES  - Go to step  10 .
    2. NO  - Go to step 7.
  7. Disconnect climate control unit connector B (20P).
  8. Turn the ignition switch ON (II).
  9. Measure the voltage between the No. 2 terminal of climate control unit connector B (20P) and body ground.
    Fig 3: Measuring Voltage Between No. 2 Terminal Of Climate Control Unit Connector B (20P) & Body Ground
    G01520124Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Check for loose wires or poor connections at climate control unit connector B (20P) and at the A/C pressure switch 4P connector. 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  -Repair open in the wire between the climate control unit and the A/C pressure switch.
  10. Disconnect climate control unit connector B (26P).
  11. Turn the ignition switch ON (II).
  12. Measure the voltage between the No. 4 terminal of climate control unit connector B (26P) and body ground.
    Fig 4: Measuring Voltage Between No. 4 Terminal Of Climate Control Unit Connector B (26P) & Body Ground
    G01520125Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Check for loose wires or poor connections at climate control unit connector B (26P) and at the A/C pressure switch 4P connector. 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  - Repair open in the wire between the climate control unit and the A/C pressure switch.
  13. Check for proper A/C system pressure.

    Is the pressure within specifications? 

    1. YES  - Replace the A/C pressure switch.
    2. NO  - Repair the A/C pressure problem.
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