Question about 1999 Ford Windstar

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1999 Ford Windstar Rear Light/REM issue ??

I have a 1999 Ford Windstar LX. The driver's side rear lamp, middle of the three lights (on when headlights are on) is out. I have swapped bulbs, and the bulbs work on the other side. I've swapped sockets, to the same effect. I've gone after this with a multimeter. I get 12 V at the socket. I have read on the internet that the Windstars have Rear Electronic Modules. I've also read that the 99 LX model does not. That confuses me. If it does not have an REM, how does the bulb ever go off? I can test 12v at this socket whether the car is on or off. I deduce from this that the mechanism for toggling the light is based on manipulating the ground, which is what an REM apparently does. I am further confused, because the fuses that feed this are obviously working. As near as I can figure, if there is an REM, then the fuses are feeding the rem, which then feeds the individual components. Or so I deduce. I'm not sure how the relays work, or how they could be involved in this. Where is this REM? Is it supposed to be on '99 LX? How does this tie in to TSB 985155, "Some vehicles may exhibit various electrical concerns caused by the tire jack pinching wires to the rear electronic module (rem)." Any thoughts? Thanks! Ben

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How would i be able to get a manual for my 1999 ford windstar van?

Posted on Jul 14, 2009

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Last week, the same light issue presented itself in my 99'. Firestone swaped lights, no go. Diagnotic... REM needs replacement... $519.99 part & $98.99 labor w/$54.16 in NYS taxes. STOP... they said they would locate used REM... 5 days later they have not called... I will consult dealer tomorrow. I paid $1000.00 for the 67K 99' Windstar, everything has worked for about one year. I was happy.... but a $673.14 light ??? Is Firestone trying to bone me ???
PS The Recmd SF Contract Worksheet says '7030715 Catalytic Converter' ???
What does the Catalytic converter have to do with the lights ???

Posted on Jul 28, 2010

  • dgatwood Jul 09, 2011

    If you can convince them to use a used part, you can get one for about $80, but otherwise, yeah, $600 is in the ballpark for that part. Of course, there's a decent chance that the problem is something else. As the original poster noted, the switching on this car is done by connecting or disconnecting the ground to the light bulb. So all it takes is one short circuit anywhere between that bulb and the rear electronics module to result in that light being permanently stuck on. That's at least as likely as the REM being bad.

    BTW, the REM contains three relays. If the failure is in the REM, I'd lay very good odds that it is caused by a stuck relay. Try cracking it open first and tapping on each relay with the plastic handle of a screwdriver or something and see if it starts working. If so, either call it fixed until it sticks again or go buy a new relay from Digikey or Newark electronics and have somebody solder it onto the board in place of the bad one. :-)

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please rate if this helps.

Exterior Lighting The exterior lighting outputs are zone controlled by the front electronic module (FEM) and rear electronic module (REM) in respect to the front exterior lights being controlled by the FEM and the rear exterior lights being controlled by the REM. An additional function of the lighting system is a lamp outage function which provides the indication to the driver if certain exterior bulbs are not functioning. With a bulb inoperative, the FEM or REM will send a message to the instrument cluster and message center (if equipped) which will in turn indicate to the driver the lamp is inoperative with a lamp out indicator (with the message center a message will be displayed). To provide complete input and output functionality, each exterior lamp feature will be described individually. All exterior lighting is powered by the switched system power (SSP) feature (refer to Switched System Power[SSP]). A failure of all or any of the SSP features will cause inoperative exterior lighting. When diagnosing exterior lighting, it is essential to determine if all related symptoms and DTCs are controlled by the SSP feature.
Stoplamps Brake lighting is controlled by the REM. The brake pedal position (BPP) switch is hardwired to the REM. When the brake pedal is depressed, the BPP switch will input information to the REM. Then, the REM will process the information and output to the left, right, and high mounted stoplamps. Only the left and right stoplamps will provide lamp outage indication.
The vehicle's electronic functions are divided into zones. The FEM controls the front portion of the vehicle and the REM controls the rear portion of the vehicle. These systems rely heavily on the SCP communication network in order to transmit and receive signals. As a technician it is very important to understand:
  • where the input (command) originates from
  • All information (messages) necessary in order for a feature to operate
  • which module(s) receive(s) the input or command message
  • does the module which received the input (message), control the output of the feature, or does it output a message over the SCP communication network to another module
  • which module controls the output of the feature
Switched System Power (SSP)
The SSP is invoked by both the FEM and REM. This function removes power from relays that provide power to the exterior lamps, interior lamps, and power door locks. This is only accomplished when both the FEM and the REM are in sleep mode. The sleep function of the FEM and REM places the modules in sleep mode when the ignition switch is in the OFF position, and no wake up (inputs) signals occur for 30 minutes. The module will not sleep if the parking lamps or the hazard lamps are active. The following relays are controlled by the SSP function: SSP1, SSP2, SSP3, and SSP4. When either the FEM or REM are not in sleep mode, all SSP relays will be energized. When energized, each relay will supply power to multiple features/functions. For additional information, go to the SSP Index for diagnosis and testing of SSP related issues. Refer to Headlamps .
Inspection and Verification
  1. Verify the customer concern by operating the stoplamps.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Damaged REM
  • Blown central junction box (CJB) Fuses:
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    • 7 (15A)
    • 12 (20A)
    • 11 (10A)
  • Damaged wiring harness
  • Loose or corroded connections
  • Damaged BPP switch

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