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If it's an automatic, check if the lever is at P or N. Check if your car has immobilizer that needs you to enter codes before it will start. Gauges moving full scale usually indicates that the instruments cluster is 'missing' an additional IGN supply. When you turn your key to the ON position, all lights in the cluster will light up. This position will make the ignition switch supply 2 IGN power to most electrical systems. If one is missing, the car may not start. Check all fuses under the fascia and in the engine bay. Be on the look out for fuses that have melted 'seats'. They may give intermittent power. Xantia's fuse slots gets melted with age, so the fuse becomes loose and supply gets disconnected.
The S light is also used like a 'check engine' light for auto transmission. There maybe some error in the transmission control system. You transmission has a computer that controls a lot of valves and solenoids in it. Check your transmission fluid level and it's integrity. If you have not changed the fluid for the last 50000kms then it's due for a change. Use only Peugeot recommended fluid. Other fluids will damage it. Mention your transmission type when buying. It's either AL4 or 4HP20. Best to buy it from authorized dealer. Garages that have a Lexia 3 scanner can scan for error codes for the transmission.
Check Fuse F3. It supplies 12v to the reverse switch located on the transmission. If auto transmission (4HP14) the switch will have 4 pins, 2 for reverse light, 2 for starting circuit. If manual, it has two pins. When gear is in other position, only one pin will have 12v. When gear is in R, both pins will have 12v. The 2nd pin supplies directly to the reversing light. Fog light has connectors behind the bumper. It tends to get corroded. Disconnect and clean both side of the connectors and retry. Some may get the wires snapped. Check there first. Fuse F18,F7 and F6 supplies 12v to the foglight circuit. F6 supplies to the foglight relay. Check the relay too.
You need to disconnect the negative side of the battery. Remove the air bag by disconnecting it from the harness. Usually yellow in color. Bear in mind, once you connect the battery. The airbag warning light will always be on even when you're driving.
not that i know off ,if its not coming on then you have two choices --connect airbag light to the oil light switch and hope the vehicle inspection man doesnt know this dodge,fit a heater glow plug unit under and connect light via this to bring light on and then make it go out without starting engine because they are getting wise to the oil light trick at the vehicle inspection.Or take it to the dealers ----normal cost at dealers is about 2000euros .If i have one failed at vehicle inspection then i have to have a certificate from dealers that airbags have been changed .More often than not the glow plug relay one will pass providing that i have checked the vehicle first ,because if they see it first?? then it will not pass without the certificate
I have had the same problem on my Xantia SX saloon moder 2000 for the past one month. Today I could solve the problem after I checked all the connectors under both the driver's and the passenger's seats. I assume that one of the connectors were somewhat loosened. You can easily reach those connectors after you move the seats backward.