STICK AS-BRG & 3631063 - Caterpillar

Low side ECM drivers provide a path to the -Battery Bus Bar to activate a lamp or other device connected to it. Caterpillar, Inc. does not require dedicated circuit protection for these circuits.Figure 33 - High Side Driver (Sourcing Driver) High side ECM drivers provide a path to +Battery to activate a lamp or other device connected to it. Caterpillar, Inc. does not require dedicated circuit protection for these circuits.Diagnostic Lamp Operation
The Diagnostic Lamp alerts the operator to the presence of active diagnostic codes. A diagnostic code indicates a fault condition in the electronic control system. The operator uses this indication to diagnose component failures in the electronic control system.Viewing Diagnostic Flash Codes
Caterpillar has developed a proprietary two digit diagnostic flash code. The two digits can be determined by observing the Diagnostic Lamp. The lamp will flash to identify the flash code. The flash code identifies active codes that have occurred after the ECM is energized.A diagnostic lamp installed by an OEM is required to indicate a diagnostic condition flash code to the operator.Determine the flash code by the following procedure:1. Count the flashes on the Diagnostic Lamp to determine the first digit.2. A two second pause will occur before the lamp flashes for the second digit.3. Count the flashes to determine the second digit.4. If more than one diagnostic condition has occurred, all of the active codes that have been received since the ECM was energized will be displayed. The two digit code for each diagnostic condition will flash with a five second pause between the flash codes.The diagnostic flash codes should only be used to indicate the nature of the occurrence of a diagnostic condition. The flash codes should not be used to perform detailed troubleshooting. Troubleshooting should be performed using SAE J1587 CID/FMI diagnostic codes that are determined by an Electronic Service Tool.Warning Lamp Operation
The Caterpillar electronic monitoring system offers optional warning lamps that can be installed by the OEM. These warning lamps alert the operator to the occurrence of several fault conditions that are detected by the ECM. The prompt observance of these fault conditions by the operator provides greater protection of the engine.The following procedure determines if the Warning Lamp circuit is functional:1. Turn the ignition switch to the ON position. Do not start the engine. When the switch is in the ON position, the ECM is energized.2. The ECM will turn the Warning Lamp on for five seconds.3. If the lamp circuit functions correctly, the Warning Lamp will turn off unless a fault condition exists.An OEM installed Warning Lamp is required to indicate a potentially engine damaging problem determined by the electronic monitoring system.Warning Indicator Lamp or Alarm
The lamp or alarm alert the operator that a fault condition has occurred. If the following events occur, the Warning Lamp or the audible alarm, if equipped, are activated:* An event code is active.* The engine is in the derate mode.When the ECM is energized, the warning indicator lamp will turn on for five seconds.