Retrieving Codes (Non-Scan)

DATA LINK CONNECTOR (DLC) TEST TERMINALS

Application

Ground/Test

16-Pin DLC

⁽¹⁾

⁽¹⁾	Tech 1 scan tester required to activate output/field service mode.

Turn ignition on. DO NOT start engine. SERVICE ENGINE SOON light should glow. Locate DLC attached to control module wiring harness. Most DLC's are located under dash on driver side of vehicle. For exact location of DLC, see COMPONENT LOCATIONS in the SYSTEM/COMPONENT TESTS article in this section. Insert jumper wire from terminal "B" (diagnostic test terminal) to terminal "A" (ground) of DLC. See Fig 1.
SERVICE ENGINE SOON light should begin to flash codes. Each code will be repeated 3 times. If codes are not flashed or SERVICE ENGINE SOON light does not glow, perform DIAGNOSTIC CIRCUIT CHECK in BASIC TESTING article in this section. To exit diagnostic mode, turn ignition off and remove jumper wire from DLC connector.

Fig 1: ALDL/DLC 16-Pin Connector Terminal ID (Corvette)

Courtesy of GENERAL MOTORS CORP.