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MCM Inputs and Outputs at Connector A (31P)

Fig 1: Identifying MCM Connector A (31P) Terminals Layout
G06950231Courtesy of AMERICAN HONDA MOTOR CO., INC.
TERMINALS DESCRIPTION CHART

Terminal number Wire color Terminal name Description Signal
1 RED IMA-CAN L (IMA CAN COMMUNICATION SIGNAL LOW) Sends and receives communication signal With ignition switch ON (II): pulses
2 WHT IMA-CAN H (IMA CAN COMMUNICATION SIGNAL HIGH) Sends and receives communication signal With ignition switch ON (II): pulses
3 PUR IGHLD (IGNITION HOLD) Drives MCM relay 1 With ignition switch turned from ON (II) to LOCK (0): about 0 V for several seconds, then battery voltage
4 LT GRN IGHLD2 (IGNITION HOLD 2) Drives MCM relay 2 With ignition switch turned from ON (II) to LOCK (0): about 1 V for several seconds
5 Not used Not used    
6 BLK PG (POWER GROUND) Ground for MCM Less than 0.2 V at all times
7 PNK IG1 Detects ignition switch signal With ignition switch ON (II): battery voltage
With ignition switch turned from ON (II) to LOCK (0): about 0 V
8 BRN + B BACK UP (VOLTAGE BACK UP) Power source for MCM circuit
Power source for DTC memory
Battery voltage at all times
9 PNK/BLK IGA (IGNITION FOR ASSIST SYSTEM) Power source for MCM control circuit With ignition switch ON (II): battery voltage
With ignition switch turned from ON (II) to LOCK (0): battery voltage for about 15 seconds, then about 0 V
10 Not used Not used    
11 Not used Not used    
12 Not used Not used    
13 Not used Not used    
14 Not used Not used    
15 Not used Not used    
16 Not used Not used    
17 Not used Not used    
18 Not used Not used    
19 Not used Not used    
20 Not used Not used    
21 Not used Not used    
22 RED F-CAN L (F-CAN COMMUNICATION SIGNAL LOW Sends and receives communication signal With ignition switch ON (II): pulses
23 WHT F-CAN H (F-CAN COMMUNICATION SIGNAL HIGH Sends and receives communication signal With ignition switch ON (II): pulses
24 Not used Not used    
25 LT BLU FANCTL (FAN CONTROL) IPU module fan speed control signal output IPU module fan OFF: battery voltage
IPU module fan ON: duty controlled
26 Not used Not used    
27 GRN SCIMD (SERIAL OUTPUT FOR DC-DC CONVERTER Sends communication signal With ignition switch ON (II): pulses
28 GRY SCIDM (SERIAL INPUT FOR DC-DC CONVERTER Detects communication signal With ignition switch ON (II): pulses
29 Not used Not used    
30 Not used Not used    
31 Not used Not used