Diesel Exhaust Fluid Post-Run Indicator Lamp Diesel Exhaust Fluid Post-Run Indicator Lamp DEF Post-Run Indicator Lamp An indicator system is required on vehicles equipped with a Negative Battery Disconnect switch. The Post-Run Indicator lamp is controlled by the Aftertreatment Control Module (ACM) and the Aftertreatment System (ATS). The Post-Run Indicator lamp is located on the negative battery disconnect switch. If the ignition is switched off while the ATS is at an elevated temperature, the ACM activates the Post-Run cycle to cool the Diesel Exhaust Fluid (DEF) doser. The Post-Run cycle will be interrupted if the Negative Battery Disconnect is switched off.
The lamp will illuminate if a Post-Run cycle is in progress, which informs the operator to delay the Negative Battery Disconnect until the Post-Run Lamp is off, except in an emergency situation. 56 All information subject to change without notice. Copyright © 2017 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0192