Checking Modules

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Generally, module failure rate is very low and therefore replacement modules usually do not resolve the root cause. Incorrect replacement of a module is often the result of inadequate testing.
- Understand the correct module function.
- Make sure programmable parameters are set correctly for the function in question.
- For additional information, refer to: MODULE CONFIGURATION SYSTEM to view list).
- Resolve DTCs first - as directed by Diagnostic Routines.
- Test all inputs, both hard-wired and networked.
- Test outputs (see "Checking module switching circuits" below).
- Check applicable TSBs for module software changes (flash programming).
Checking module switching circuits.
- Using the scan tool module-output command function (e.g., Integrated Diagnostic System Output State Control) to activate components is a fast way to confirm an output is capable of being switched on by the module. Testing that reveals normal module-output function confirms the need to analyze the module inputs.
- Don't apply ground or power directly to module-switched components with jumper wires (unless directed by an appropriate procedure), as the component can be damaged by a direct connection to ground/power.