If anyone you know is struggling to fix aircon issues use the information in here to assist members and friends. Models Affected Civic 3D FN1, FN2, FN3, FN4 All Civic 5D FK1, FK2, FK3 06, 07, 08, 09, 10, 11 CR-V RE5 07, 08, 09, 10, 11 CR-V I-CTDI RE6 07, 08, 09 CR-V I-DTEC RE6 10, 11 Jazz GG4, GG5, GG6 09, 10, 11, 12 Honda TSB SM-10-002-00 Dated 27-03-12 Symptom The air conditioning compressor magnetic clutch relay fails causing permanent Air Conditioning compressor clutch engagement, pressure loss and battery drain or no Air Conditioning compressor clutch engagement with no Air Conditioning function. Cause Moisture was able to penetrate the relay and mix with the nitrogen given off when the relay contacts arc. This created Nitric acid which corroded the contact points of the relay. Countermeasure To prevent Nitric acid forming the relay for use in the Air Conditioning compressor clutch circuit has been changed to one with improved sealing properties, this prevents moisture entering the relay. This relay is manufactured by Mitsuba and the previous Omron relay is no longer used in this application Application to Production Line SHHFN1***BU000969 SHHFN2***BU000124 SHHFN3***BU000130 SHHFN4***BU002381 SHHFK1***BU008231 SHHFK2***BU009855 SHHFK3***BU003386 SHSRE5***BU010510 SHSRE6***BU013580 SHHGG5***CU001900 SHHGG6***CU000550 Repair Method 1. Confirm the symptom reported by the customer. 2. Check which type of compressor magnetic clutch relay is fitted to the fuse box. Note: The relay manufactures name is marked on the top of the relay. If the relay is manufactured by Omron, replace the relay and any other components damaged as a result of the relay failure. If the relay is manufactured by Mitsuba, carry out a relay test as per the workshop manual Parts Information <Part Number> <Part Name> 39794-SDA-A05 RELAY ASSY., POWER (MICRO ISO) (MITSUBA) Care should be taken when ordering a replacement relay, The Omron relay is a common relay and is still available and can be used for other circuits on the vehicle. For the Air Conditioning clutch circuit the Omron relay MUST NOT be used. If a Mitsuba relay is required, please order the part number shown as above.