Diagnostic Aids
- A control module may have a U-code stored in history that does not require any repairs. Problems with late or corrupt messages between control modules may only be intermittent without any obvious symptom or problem. This does not mean the control module is faulty. Do not replace a control module based only on a history U-code.
- Do not replace a control module reporting a U-code. The U-code identifies which control module needs to be diagnosed for a communication issue.
- Communication will be available between the master control module and the scan tool if there is a loss of communications with any of the other control modules on the LIN bus network.
- An open in the LIN bus serial data circuit between the splice pack and a module will only affect that specific module. This type of failure will set a loss of communication DTC for each control module affected and the other control modules will still communicate.