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Scan Tool Does Not Communicate With Class 2 Device

See TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in ANTI-LOCK article in BRAKES (for Cab & Chassis & Pickup) or SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in BODY CONTROL MODULES article (for Escalade, Tahoe Limited & Z71 & Yukon Denali).