immobiliser issues
 

hi i have a 99 uk voyager but visiting france during hot weather the immobiliser would cut in during starting, after repeated locking/ulocking doors with the key fob it would start working again. it only happens during hot weather.dont know if the keyfobs have anything to do with it but the heat affects it defo. thanks

Hi
Remove the heater panel and check the 21 pin plug for melting is the first place to start. When you say immobilizer do you mean it start runs for 2 seconds then cuts out and then doesn't start? or is the alarm light staying on and it doesn't even turn over? does the dash gauges all work with the ignition on?

yeah it will start for a couple of secs then die, the dash guages tend not to work whilst the system is immobilised,

yep check the heater panel first.

cheers for that mate, checked the heater wires at the back and nothing obvious,anything else to check??

you unplugged it and checked pin 21? (in the corner and it's not melted) Next will be the dash soldered joints broken. You may find tapping the dash then turning on and off the ignition will allow it to start. You will need to remove the dash circuit board to check properly.

cheers for the help that will be the next job when i can

I had the same problem albeit with an extra twist, the ABS light came on, followed by the alarm light, and I'd lose gauges and could not start the car, although if the car was already running it would continue. Banging the dash was a hit and miss affair but would normally cure the problem for a day or two.

Following Merlin's advice I checked the heater panel and Pin 21, which although did show some signs of melting was ok. I future proofed this as pin 21 is an earth, I spliced another piece of cable into the earth cable and connected that using a ring terminal onto one of the screws on the back of the heater panel, thus bypassing the need for pin 21.

I then removed the dash and inspected the solder joints on the cable connector on the back of the dash. Even with a magnifying glass and 20:20 vision I was unable to see any soldering faults. However upon re-installing the dash, the fault was on permanently even with wiggling the cable on the back on the dash.....so out it came again.......

This time I could clearly see a small crack in the solder on one of the connections. After de-soldering and redoing the faulty solder....the problem was solved. I can't remember which pin it was but it was one of the corner ones. So even if you cannot initially see a faulty solder there may be one there!

Thanks Merlin....you saved me a fortune :)

thanks for the feed back and great right up it will help others.

:)been to holland for a in the motor without probs thanks guys for all the help, will chech the dash asap