Fault Code Guide

Park Brake (pneumatic) Function
Input to CHM from Park
Brake Pressure Switch
Input to BHM from CHM
via J1939 Park Brake
Status
Output from BHM to ICU
via J1939 Park Brake
Light Status
Closed Engaged On
Open Disengaged Off
Table 21, Park Brake (pneumatic) Function
Park Brake (pneumatic) Function Fault Conditions
*
Description of Fault Action Taken by BHM
CHM transmits J1939 park brake switch status unavailable
or in error to the BHM.
BHM may transmit J1939 message park brake light status
unavailable.
*
This fault also occurs when the CHM is unable to determine the switch status. This does not necessarily mean that the park brake pressure switch is faulty.
Table 22, Park Brake (pneumatic) Function Fault Conditions
Parameters
Parameter
Part Number
Description Hours
26-01017-002 Switched Center Pin Power 24
26-01019-003 Exterior Lighting 16,667
26-01019-004 Exterior Lighting 16,667
Parameters
Parameter
Part Number
Description Hours
26-01019-005 Exterior Lighting 16,667
Table 23, Parameters
Wake Circuits Troubleshooting Procedures
Test
No.
Test Procedure Test Result Action
1 Open the "Wake Function" Datalink Monitor template. See
Fig. 12.
Put the system into a sleep state by:
• Closing the doors.
• Turning off the headlight switch.
• Turning off the hazard lights switch.
• Turning off the ignition switch.
• Removing your foot from the brake pedal.
Are any of the BHM and CHM initiating inputs still in an active
state on the template (yellow)?
Yes Check the inputs that are remaining
active.
For example, if the driver door switch
remains active (open) when the door
is closed, check the door switch itself
and the circuit wiring.
Repair as necessary.
No
Go to test no. 2.
Bulkhead Module 54.12
Troubleshooting
Business Class M2 Workshop Manual, Supplement 22, September 2012 300/15