Ey up,

 

Recently got an 03 SDI estate for the girlfriend.

 

It's good except for an intermittent immobiliser fault.

 

It's had the wires replaced with two yellow ones in a separate little loom from the clocks to the reader coil, previous owner says this fix worked for 8 months or so now it's on the blink again.

Wiggling where this connects to the block behind the right hand heater vent gets it to start, but it's bloody annoying.

 

Must be some poor contact in the connector, I'm pondering removing the wires from both sides and soldering them up, would this be the act of a lunatic?

 

Suppose there is another option to get the clocks coded to disable the immobiliser? I've seen a non-immobilised ECU on ebay, but believe this will give a constant immobiliser fault on the clocks.

 

 

Oh and just for more fun, the button on the dash has gone tits so you can't put the pass code in!

 

Cheers

Edited 3 November, 201411 yr by yorkiechris

Pull connector apart, use multimeter to do a connectivity check or voltage check on the wires. Would help if you referred to the wiring diagram at the same time.

Haynes doesn't seem to give a resistance rating for the reader coil. It's definitely got continuity through that connector intermittently.

 

Voltage wise, no idea what to expect, I'd presumed it was some sort of pulse that it sends out that the key chip returns?

Haynes doesn't seem to give a resistance rating for the reader coil. It's definitely got continuity through that connector intermittently.

 

Voltage wise, no idea what to expect, I'd presumed it was some sort of pulse that it sends out that the key chip returns?

 

The 'reader coil' is really just an antenna, so you should have permanent continuity through it, no resistance at all. You won't pick up the key signal without sensitive equipment, it will be very weak, nothing wrong with hardwiring it if you suspect the connector.

Well the wire must have been fine but I think the pins were a bit wobbly and the joints of the multi connector to the clocks PCB looked suspect. I reflowed these with a bit more solder, soldered the crimps of the wires and gave the female pins a bit of a tweak to tighten them up.

 

Hope it lasts but not too bad a job to do and it has sorted it for a week or two now.