CIRCUIT DESCRIPTION:The ECM monitors the status of the brake switch circuits through ECM terminal (purple wire)
code 38 will set if
* no code 24 is present
* vehicle speed has been above 35mph and back to 0mph several (22) times.
* status on the purple wire circuit has not change state "high" to "low"
DIAGNOSTIC AIDS:A code 38 in combination with code 39 would mean a problem with one or more of the following components. Fues, Pink and black wire, brake switch or wire before the spice.
A single code 38 is the result of a wire or purple wire circuit problem between the splice and ECM, poor connection to ECM connector, or possibly the ECM.
SOURCE: GM SERVICE MANUAL.
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