Vehicle Damage Cautions
CAUTION:
Before disconnecting any control module, make sure ignition is "off". Failure to do so could damage module.
When testing voltage or continuity at any control module, use terminal side (not wire end) of connector. Do not probe a wire through insulation; this will damage it and eventually cause it to fail because of corrosion.
Be careful when performing electrical tests so as to prevent accidental shorting of terminals. Such mistakes can damage fuses or components. Also, a second code could be set, making diagnosis of original problem more difficult.