Fault Code Guide

General Information
Subject 410 contains information on all proprietary
Bulkhead Module (BHM) fault codes for J1587 and
J1939 datalink protocols, how to view these codes,
and what the codes mean. Each fault code contains
three distinct pieces of information.
J1587 fault codes consist of the following elements in
the order listed:
• Module Identifier (MID) – Identifies which elec-
tronic control unit (ECU) the fault is coming
from. The J1587 MID identifying all Bulkhead
Module information faults is 164.
• Subsystem Identifier (SID) – Indicates what
function on the ECU has failed. All J1587 SIDs
for the BHM are listed in Table 1.
• Failure Mode Indicator (FMI) – Indicates in
what way the function failed.
J1939 fault codes consist of the following elements in
the order listed:
• Source Address (SA) – Identifies which ECU
the fault is coming from. The J1939 SA identi-
fying all Bulkhead Module faults is 33.
• Suspect Parameter Number (SPN) – Indicates
what function on the ECU has failed. All J1939
SPNs for the BHM are listed in Table 2.
• Failure Mode Indicator (FMI) – Indicates in
what way the function failed.
See Table 3 for a list of all failure mode identifiers for
both datalink protocols.
References such as BHM B1.A indicate that the fault
is sensed to be coming from the Bulkhead Module,
connector B1, pin A. Similarly, CHM indicates the
Chassis Module on a vehicle.
J1587 fault codes are shown under J1708 in Service-
Link. J1587 and J1708 are essentially the same
datalink protocol.
Because the SAE J1939 subcommittee approves
new SPNs for use in J1939 messaging on a con-
tinual basis, J1939 SPNs used for diagnostic mes-
sages could change when the Bulkhead Module part
changes. These changes could impact any diagnos-
tic message with an SPN value of 6915 or higher.
J1587 SIDs for Bulkhead Module (BHM) MID 164
SID Description Possible FMI
000 Backlighting Dimmer Switch Fault 7
001 Clutch Switch Fault 7
002 Reserved for Future Use —
003 Headlamp Switch Disagreement–Both park and on inputs are closed 7
004 Multifunction Turn Signal Switch High Beam Input Fault 2
005 Ignition Switch Fault 7
006 Marker Interrupt Switch Fault 7
007 Multifunction Turn Signal Switch Disagreement–Both wiper high and wiper low inputs are
on.
2
008 Multifunction Turn Signal Switch Disagreement–Wiper on/off is off and wiper high or low
input is on
2
009 Wiper Park Input Fault 7
010 ICU3-M2 Hazard Switch CAN Feedback Error 2
011 Multifunction Turn Signal Switch Left Turn Signal Input Fault 2
012 Multifunction Turn Signal Switch Right Turn Signal Input Fault 2
013 Multifunction Turn Signal Switch Washer Switch Input Fault 2
014 Multifunction Turn Signal Switch Wiper On/Off Input Fault 2
Bulkhead Module 54.12
Bulkhead Module Fault Code Information
Business Class M2 Workshop Manual, Supplement 22, September 2012 410/1