Checking Modules

WARNING: This page is about a different car, the 2018 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

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 (Refer to Module Configuration for more information).
- 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 (for example, IDS 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 a service information procedure), as the component could be damaged by a direct connection to ground/power.