Battery Module Fan Keeps Running, or Always Runs at High Speed

NOTE: Information marked with an asterisk (*) applies to the BATTFANH line.

Turn the ignition switch OFF.
Remove the cargo floor mat (see TRIM REMOVAL/INSTALLATION - CARGO AREA ).
Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
Disconnect BCM module connector A (26P).
Does the battery module fan run?
1. YES - Go to step 6.
2. NO - Substitute a known-good BCM module, and recheck. If the symptom goes away, replace the original BCM module.
Remove the low speed battery module fan control relay and the high speed battery module fan control relay.
Check for continuity between body ground and BCM module connector terminals A11 and A24*.

Fig 1: Checking Continuity Between Body Ground And BCM Module Connector Terminals A11 And A24*
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short to ground in the wire between the BCM module (A11, A24*) and the low (high)* speed battery module fan control relay.
2. NO - Go to step 8.
Check the low (high)* speed battery module fan control relay (see POWER RELAY TEST ).
Is relay OK?
1. YES - Repair short to ground in the wire between the battery module fan and high speed battery module fan control relay.
2. NO - Replace the battery module (see BATTERY MODULE REMOVAL/INSTALLATION ).