A/C Condenser Fan High Speed Circuit Troubleshooting

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
Before doing any symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Remove the fan control relay from the relay block, and test it (see POWER RELAY TEST ).
Is the relay OK?

YES -Go to step 2.

NO -Replace the fan control relay.
Turn the ignition switch to ON (II).
Measure the voltage between fan control relay 5P socket terminal No. 5 and body ground.

Fig 1: Measuring Voltage Between Fan Control Relay 5P Socket Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 4.

NO -Replace the under-hood fuse/relay box (see DTC B1065: RELAY CONTROL MODULE LOST COMMUNICATION WITH DRIVER'S MPCS UNIT (DRLOCKSW MESSAGE) ).
Turn the ignition switch to LOCK (0).
Check for continuity between fan control relay 5P socket terminal No. 2 and body ground.

Fig 2: Checking For Continuity Between Fan Control Relay 5P Socket Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 6.

NO -Check for an open in the wire between the fan control relay and body ground. If the wire is OK, check for poor ground at G202 (see CONNECTOR TO FUSE/RELAY BOX INDEX ).
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
Disconnect PCM connector A (49P).
Check for continuity between fan control relay 5P socket terminal No. 3 and PCM connector A (49P) terminal No. 5.

Fig 3: Checking For Continuity Between Fan Control Relay 5P Socket Terminal No. 3 And Pcm Connector A (49P) Terminal No. 5
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires or poor connections at PCM connector A (49P) terminal No. 5. If the connections are good, substitute a known-good PCM (see SUBSTITUTING THE PCM ), and recheck. If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT ).

NO -Repair an open in the wire between the fan control relay and the PCM.