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DTC P1648 (64): BCM Module Communication Signal Circuit Problem

NOTE: Information marked with an asterisk (*) applies to the BATTSCI 2 line.
  1. Reset the MCM (see HOW TO RESET THE MCM ).
  2. Turn the ignition switch ON (II).

    Is DTC P1648 (64) indicated? 

    1. YES  - Go to step 3.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the BCM module and at the MCM.
  3. Turn the ignition switch OFF.
  4. Turn the battery module switch OFF (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
  5. Remove the IPU lid (see TURNING OFF POWER TO THE HIGH VOLTAGE CIRCUIT ).
  6. Disconnect MCM connector C (31P) and BCM module connector A (26P).
  7. Check for continuity between body ground and MCM connector terminals C22 and C21* individually.
    Fig 1: Checking Continuity Between Body Ground And MCM Connector Terminals C22 And C21
    G03681423Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short to ground in the wire between the MCM (C22 or C21*) or the BCM module (A20 or A7*).
    2. NO  - Go to step 8.
  8. Check for continuity between BCM module connector terminal A20 and MCM connector terminal C22, and between BCM module connector terminal A7* and MCM connector terminal C21*.
    Fig 2: Checking Continuity Between BCM Module Connector Terminal A20 (A7*) And MCM Connector Terminal C22 (C21*)
    G03681424Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Substitute a known-good MCM and BCM module, and recheck. If the symptom/indication goes away, replace the original MCM and BCM module.
    2. NO  - Repair open in the wire between the MCM (C22, C21*) and the BCM model (A20, A7*).
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