GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39200 Multimeter

  1. Refer to Starting and Charging Schematics for the actual wiring diagram for the CS charging system.
  2. When operating normally, the indicator lamp will come on, then go out when the engine starts. If the indicator does not work properly, or if the battery is over or undercharged, refer to Engine Controls for diagnosis of the charging system.