Digital Speedometer Segments Do Not Illuminate

1. Turn ignition on. Using a test light connected to ground, backprobe digital speedometer module connector terminal "F" (Brown wire). See Fig 1. If test light does not illuminate, repair open circuit in power supply (Brown wire).
2. If test light illuminates, backprobe test light between digital speedometer module connector terminals "F" (Brown wire) and "A" (Black wire). If test light illuminates, check for poor connections. If connections are okay, replace instrument cluster. If test light does not illuminate, repair open circuit in Black ground wire.

Fig 1: Identifying Terminals Of Digital Readout Display Connector

Courtesy of GENERAL MOTORS CORP.