U0019-CAN B BUS





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    The TIPM detects an open, a short high, a short low or a short together in either of the CAN B Bus circuits.


Possible Causes
  
(D55) CAN B BUS (+) CIRCUIT OPEN
  
(D54) CAN B BUS (-) CIRCUIT OPEN
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO VOLTAGE
  
(D54) CAN B BUS (-) CIRCUIT SHORTED TO VOLTAGE
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO GROUND
  
(D54) CAN B BUS (-) CIRCUIT SHORTED TO GROUND
  
(D55) CAN B BUS (+) CIRCUIT SHORTED TO (D54) CAN B BUS (-) CIRCUIT
  
ANY CAN B BUS MODULE
  



Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.








Does the scan tool display this DTC as active?

Yes
  • Go To 2


No
  • The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2.MEASURE VOLTAGE AT TIPM




Does the voltage read approximately 4.65 - 4.98 volts on the (D54) CAN B Bus (-) and 0.39 - 0.46 volts on the (D55) CAN B (+) circuits?

Yes
  • Go To 3


No - Voltage Between 0.3 - 0.7 Volts on Both Circuits
  • Go To 9


No - Voltage Reads 0 Volts on Either Circuit
  • Go To 7


No - Voltage Above 10 Volts on Either Circuit
  • Go To 5

3. (D55) CAN B BUS (+) CIRCUIT OPEN






NOTE: A red “X” will appear next to modules that can no longer communicate on the Bus.



Did a red “X” appear next to any modules on the scan tool?

Yes


No
  • Go To 4

4. (D54) CAN B BUS (-) CIRCUIT OPEN





NOTE: A red “X” will appear next to modules that can no longer communicate on the Bus.



Did a red “X” appear next to any modules on the scan tool?

Yes


No

5.(D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE








Is the voltage above 10.0 volts?

Yes
  • Disconnect each CAN B Bus module one at a time while observing the voltage to determine if the short is caused by an internal short within a module. Replace the module, in accordance with the service information, that when disconnected eliminates the short to voltage. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the (D55) CAN B Bus (+) circuit for a short to voltage.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).


No
  • Go To 6

6.(D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE





Is the voltage above 10.0 volts?

Yes
  • Disconnect each CAN B Bus module one at a time while observing the voltage to determine if the short is caused by an internal short within a module. Replace the module, in accordance with the service information, that when disconnected eliminates the short to voltage. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the (D54) CAN B Bus (-) circuit for a short to voltage.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).


No

7.(D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND







Is the resistance above 1000.0 ohms?

Yes
  • Go To 8


No
  • Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module, in accordance with the service information, that when disconnected eliminates the short to ground. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the (D55) CAN B Bus (+) circuit for a short to ground.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

8.(D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND





Is the resistance above 1000.0 ohms?

Yes


No
  • Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module, in accordance with the service information, that when disconnected eliminates the short to ground. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the (D54) CAN B Bus (-) circuit for a short to ground.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

9. (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT







Is any resistance present?

Yes
  • Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module, in accordance with the service information, that when disconnected eliminates the short between the two circuits. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the (D55) CAN B Bus (+) circuit for a short to the (D54) CAN B Bus (-) circuit.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).


No