A mileage of about 140,000 km of 2005 Mercedes-Benz S500 sedan. Users reflect: the car parked overnight after the vehicle failed to start.
Troubleshooting: the vehicle is turned off, turn off all electrical equipment. Remove the key, put the lid lock switch, door switch and door switch, tail cap switch is in lock car lock status. Access to vehicle power supply circuit with a multimeter's Ground loop, determine the battery voltage is greater than 12V. Found within 20min, battery discharge current is not reduced to 50mA, reach 2A above, there is leakage phenomenon, certainly not sleep module, is awake. To narrow range, first unplug the power cord left front SAM, SAM makes the front left off all power obd news supply modules do not work, the discharge current is not decreased significantly. Then unplug the power cord right front SAM nor decreased significantly. When SAM after unplug the power cord, the discharge current rapid decline, falling to the 50mA, narrowed it down to the SAM above the power module.
After returning to rearm SAM power cord, fuses one by one pulling on the rear SAM. When pulling PSE pump fuse No. 62, the discharge current is normal. Removal of the box on the left tail trim, unplug the PSE pump power plug, plug it back in the fuse, the discharge current normal range, defined as PSE pump is awake. PSE pump itself may have a problem or CAN line, there are so PSE pump is awake and PSE pump receives a signal to the switching signal is awake these three possibilities. PSE pump itself is not considered a problem, make sure the other two reasons. If the CAN line, there are so PSE pump wakeup signal that sends the signal module certainly in working condition. But now only a PSE pump module is awake, there are signals that the CAN line to make PSE pump wake this reason may be less. However, in order to determine what still needs to be detected.
PSE pump back into the power plug, unplug the cord CAN PSE pump, the discharge current is not normal. CAN line obd scanner proved no signal so that the pump is awake PSE (PSE pump CAN plug in X36 / 5 on the bus, the bus X36 / 5 at the door at the left front). The main role of PSE is the door suction pump, central locking, tail door suck and unlock to unlock the fuel tank cap. Switching signal itself received only three main, tail cap switch is released, the tail cap lock switch, RTL button. 3 switches were examined and found to release the tail cap switch resistance is not normal, the switch has a slight adhesions. Unplug this switch plugs, re-testing the leakage situation. PSE pump within a predetermined sleep time, is not in the awake state, the discharge current is normal.
Troubleshooting: After replacing the switch, troubleshooting.
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