b'Retailer Technical Journal 14545 $IWHU\x03UVW\x03GLVFRQQHFWLQJ\x03WKH\x03EDWWHU\\\x0f\x03DOO\x03HLJKW\x03HOHFWULFDO\x03FRQQHFWRUV\x03ZHUH\x03 inner circuit board. The board did not show any signs of damage from the Water intrusion unplugged from the CEM before removing it for inspection. Connector B,coolant ingress; only the pins for Connector B were corroded. He carefully into passenger a narrow 32-pin connector, was directly beneath the heater pipe junctioncleaned the CEM pins and then reassembled the module. compartment and took the brunt of the coolant leak. The connector terminals and the S40/V50 pins on the module were corroded. A pin-out diagram for the CEM wasWhen reinstalling the Central Electronics Module back into the vehicle, he consulted, and the pins with the heaviest corrosion were for the low-speedapplied Stabilant 22A contact enhancer to the pins and Connector B of the Volvo Cars of North America, LLC Date 10-7-2008 CAN bus, Steering Column Lock power supply, Key Lock Ignition control&(0\x11\x037KH\x03QDO\x03VWHS\x03ZDV\x03WR\x03SXW\x03WKH\x03IURQW\x03FDUSHW\x03VHFWLRQV\x03EDFN\x03LQ\x03SODFH\x0f\x03EXW\x03Technical Support circuit, and the LIN 2 bus communication line.before doing that, the A-post ground wires were cleaned and tightened.Reference: VIDAThe diagnosis seemed clear: corrosion on the Central Electronics ModuleWith the coolant leaks at the heater pipe and thermostat housing repaired 127(\x04\x03I\x03XVLQJ\x03D\x03SULQWHG\x03FRS\\\x03RI\x03WKLV\x035HWDLOHU\x037HFKQLFDO\x03-RXUQDO\x0f\x03UVW\x03 connector was causing the warning lights and no-start condition. Furtherand the Central Electronics Module cleaned and reassembled, it was time to check fo rthe latest online version. research showed that the headlamps, or gas lamp discharge modules, wereroad test the Volvo. All fault codes were cleared, and the V50 was taken out also on the LIN 2 bus. So it appeared that the headlamp issue might also beIRU\x03DQ\x03H[WHQGHG\x03WHVW\x03GULYH\x11\x037KH\x03YHKLFOH\x03ZDV\x03VKXW\x03R\x03DQG\x03UHVWDUWHG\x03PXOWLSOH\x03AFFECTED VEHICLES: related to the coolant-contaminated CEM. WLPHV\x03ZLWKRXW\x03LVVXH\x0f\x03FRQUPLQJ\x03WKDW\x03WKH\x03LQWHUPLWWHQW\x03QR\x10FUDQN\x03FRQGLWLRQ\x03Models Type Model year Chassis range ZDV\x03[HG\x11\x03:KHQ\x03WXUQLQJ\x03RQ\x03WKH\x03KHDGODPSV\x0f\x03WKH\x03%HDP\x030DOIXQFWLRQ\x03ZDUQLQJ\x03See the following pages for chassis rangesAn estimate was put together for replacing the heater pipe O-rings andmessage returned. S40 544 2004.5 - listed by issue thermostathousinganddisassemblingtheCEMtocleanthecorrosion from the terminals. After the customer approved the estimate, the coolingBackattheshop,allthemoduleswererescanned,andnoneofthe V50 545 2005 -See the following pages for chassis rangessystem repairs were given to a younger technician to complete.communication or CAN faults had returned. However, two permanent faults listed by issue were logged in the CEM for the right headlamp: 8A09 low beam right faulty Whilethecoolantwasdraining,theB-Techremovedtheaircleanersignal and 8A25 Gas Discharge Lamp (GDL) module right faulty signal. Passenger Side Floor Pan DESCRIPTION: We have had cases of water intrusion into the passengerhousing, which is wedged between the coolant fan assembly and the intakeThe headlamp failure was unrelated to the corroded CEM connector; it was compartment of S40 and V50 vehicles. Customer comments may include:manifold and is frustrating to remove. Next, he replaced the thermostatD\x03GLHUHQW\x03SUREOHP\x11While reading through service information, the technician found a 13-pagewater on the carpet, odor, and noise. If you have a vehicle with water on thehousingalongwithanewthermostatandgaskets.Then,hecarefully document from Volvo outlining the possible water leaks on this vehicle,IURQW\x03RRU\x03RI\x03WKH\x03SDVVHQJHU\x03FRPSDUWPHQW\x03EH\x03VXUH\x03WR\x03inpsect / addressseparated the heater pipe junctions to replace the O-rings.The owner of the station wagon was called and updated as to the progress of includingthewindshield,sunroof,A-pillars,cowl,anddoorjambs.Inall causes of intrusion listed within this document as necessary toOnce the old seals were removed, the problem was evident. One of thethe repairs and that the headlamp issue remained. The technician reviewed addition, the sunroof drains and the evaporator drain can become cloggedavoid repeat repair! These are known issues and are the most commonO-rings had been misaligned and pinched, causing it to deform over time.the headlight description of operation to be sure he fully understood the and cause water to leak into the passenger compartment. High-pressureFDXVHV\x03RI\x03ZDWHU\x03LQWUXVLRQ\x03RQ\x036\x17\x13\x03DQG\x039\x18\x13\x11\x03RX\x03PD\\\x03QG\x03PRUH\x03WKDQ\x03RQH\x03RI\x03 system. This Volvo used high-intensity discharge Xenon light bulbs, with these conditions exists simultaneously causing the water intrusion.The heater core was most likely replaced at some point, and the O-ring waseach headlamp assembly having a Gas Discharge Lamp module and an car washes should be avoided on these vehicles due to all the potentialGDPDJHG\x03GXULQJ\x03UH\x10LQVWDOODWLRQ\x11\x03$IWHU\x03WKH\x03FRROLQJ\x03V\\VWHP\x03ZDV\x03YDFXXP\x03OOHG\x03 electronic ballast to power the bulbs. water leaks. NOTE:\x03\'R\x03QRW\x03OLPLW\x03WKH\x03SRVVLEOH\x03FDXVH\x03WR\x03WKHVH\x03OLVWHG\x0f\x03DOWKRXJK\x03OHVV\x03OLNHO\\\x03 and bled, the Volvo was returned to the diagnostic tech to handle the CEM you may have an issue not included here. disassembly and cleaning. 7KH\x03KHDGODPS\x03EXOE\x03ZDV\x03UHPRYHG\x03UVW\x03DQG\x03ORRNHG\x03QHZ\x0f\x03FRQUPLQJ\x03ZKDW\x03WKH\x03Further inspection found water stains on the headliner and multiple holescustomer said about replacing it. The fault codes indicated a problem with drilled in both door jambs for aftermarket speaker wires. Additionally, theWater Intrusion Bulletin Before disassembling the module, the technician photographed the fuseWKH\x03ULJKW\x03*DV\x03\'LVFKDUJH\x03/DPS\x03\x0b*\'/\x0c\x03PRGXOH\x0f\x03EXW\x03WKDW\x03QHHGHG\x03WR\x03EH\x03YHULHG\x03sunroof drains had debris and were a potential leak source. With the waterlayout and connector orientation for later reference. Removing all the fusesthrough testing. OHDNV\x03SDUWLDOO\\\x03JXUHG\x03RXW\x0f\x03WKH\x03FRRODQW\x10VRDNHG\x03SDVVHQJHU\x03FDUSHW\x03ZDV\x03QH[W\x03 and relays, and separating the two halves of the plastic housing, exposed the up to solve.7KH\x03SRZHUV\x03DQG\x03JURXQGV\x03WR\x03WKH\x03ULJKW\x03KHDGODPS\x03PRGXOH\x03ZHUH\x03FRQUPHG\x0f\x03AfterselectingthecorrectVolvocoolanttankadapterforthepressureZKLFK\x03 RQO\\\x03 OHIW\x03 WKH\x03 FRPPXQLFDWLRQ\x03 OLQHV\x03 WR\x03 EH\x03 YHULHG\x11\x03 7KH\x03 *DV\x03 /DPS\x03Discharge (GDL) Modules communicate using a LIN bus. The drivers side, tester, the cooling system was pressurized. Within seconds coolant couldor left GDL, acts as a master and communicates directly with the Central beseendrippingfromunderneaththeaircleanerhousing.AidedbyaElectronics Module. At the same time, the passenger side, or right GDL, mirror, the source of the leak was pinpointed at the thermostat housing.acts as a slave and communicates with the left GDL module through the The plastic housing would need to be replaced, but that was not the reasonLIN bus as well. for the coolant in the passenger compartment. While watching for leaks XQGHU\x03WKH\x03GDVKV\x03ULJKW\x03VLGH\x0f\x03QRWKLQJ\x03DSSHDUHG\x03DW\x03UVW\x11\x03(YHQWXDOO\\\x0f\x03RQH\x03RI\x03WKH\x03 The LIN bus system is a standardized communication network used by heater pipes began seeping coolant where the pipes connected to the heatermultiple vehicle manufacturers. It stands for "Local Interconnect Network," core. Due to the pipes location, coolant could drip directly onto the Centraland is a serial communication protocol used to exchange data between Electronic Module (CEM), located just below the glovebox.various Electronic Control Units (ECUs) in the vehicle.TheCentralElectronicsModulecontrolsvariouselectricalsystemsandThe LIN bus system uses a master-slave architecture, where one ECU acts functions on Volvo vehicles. The CEM houses a fuse and relay block andas the master, and other ECUs, or nodes, work as slaves. The master ECU is responsible for powering the lighting, washers, fuel pump, and climatebroadcasts messages on the bus requesting data from each slave ECU, and control. It also acts as a gateway for the communication networks on thethe slave responds with the requested data.car, bridging the low-speed CAN, high-speed CAN, and LIN buses. Finally,LINcommunicationprotocolusesasinglewirephysicallayerandcan the CEM manages the vehicles security system and validates the key signaloperate at speeds up to 20 K baud per second, with standard speeds being through the Start Control Unit and the Steering Column Lock.Heater Pipe Connections Cleaned CEM Terminals 9.6 K baud and 19.2 K baud. In addition, the LIN protocol easily integrates 27 8'