| Table 1: | Air Brake Dryer (JTU) | 
| Table 2: | Low Air Pressure Switch - Primary | 
| Table 3: | Low Air Pressure Switch - Secondary | 
| Table 4: | Park Brake Switch (JE4) | 
 
 | |||||||
|---|---|---|---|---|---|---|---|
Connector Part Information  | 
 
  | ||||||
Pin  | Wire Color  | Circuit No  | Function  | ||||
A  | BN  | 541  | Ignition 3 Voltage  | ||||
B  | BK  | 350  | Ground  | ||||
 
 | |||||||
|---|---|---|---|---|---|---|---|
Connector Part Information  | 
 
  | ||||||
Pin  | Wire Color  | Circuit No  | Function  | ||||
A-B  | --  | --  | Not Available  | ||||
C  | BK  | 350  | Ground  | ||||
D  | D-GN/WH  | 2662  | Low Air Pressure Switch Signal  | ||||
 
 | |||||||
|---|---|---|---|---|---|---|---|
Connector Part Information  | 
 
  | ||||||
Pin  | Wire Color  | Circuit No  | Function  | ||||
A-B  | --  | --  | Not Available  | ||||
C  | BK  | 350  | Ground  | ||||
D  | D-GN/WH  | 2662  | Low Air Pressure Switch Signal  | ||||
 
 | |||||||
|---|---|---|---|---|---|---|---|
Connector Part Information  | 
 
  | ||||||
Pin  | Wire Color  | Circuit No.  | Function  | ||||
A-B  | --  | --  | Not Available  | ||||
C  | L-BU  | 1134  | Park Brake Switch Signal  | ||||
D  | BK  | 750  | Ground  | ||||