B

Bng01

Member
Hi. New to the forum
I have a Land Rover Defender 110 2005 with a Wabco ABS system on it.
The vehicle had been standing for a few months and the battery was flat. The customer jumped started the vehicle and had Handbrake warning light, ABS and Traction control lights on dash.
4 fault codes stored for Input/Output valves short circuit to ground.
We did continuity checks on the wiring and all is ok. We have changed the main Abs unit by the inner wing, fault still present.
We changed the ECU under the drivers seat. Coded in the new unit all ok. Chassis number is in the new unit. The traction control light is now off. The Abs light comes on with ignition, goes out but comes back on 2 seconds later. The handbrake/Fluid level red light is on permanently. We have checked the wiring, and found no fault. Tried another fluid reservoir to eliminate the fluid switch. Still on. No fault codes stored.
The Ecu must have had a fault as the codes have gone and traction light operating ok. I feel the hand brake light is the issue.
Can anyone supply and accurate wiring diagram or shed any light on my problem. Thanks
 
bankz5152 said:
Check the handbrake plug behind the handbrake gaiter. Often falls to bits
Click to expand...
Hi Thanks for the reply. Do you mean the little switch with a single wire on it? If so that is all ok. I cant work out how to distinguish wether its the fluid level switch or handbrake switch thats leaving the light on.
 
Yeah. The pluga in the fluid cap can corrode and cause the same issue. Check there.

Fluid brimmed?
 
Does anyone know if the circuit board on the row of warning lights in the instrument cluster could be faulty? Its looks like a row of LED's but you have to disconnect both wiring plugs from this to turn light out. If either plug is fitted, the light is on o_O
 
Bng01 said:
just the red handbrake light and the ABS light. No other warning lights on. And no fault codes in any ecu.
Click to expand...
Does anyone know where a connector would be. On the wiring diagram im using its 'Header C0288-8 (K109)
 
Last edited:
Bng01 said:
Hi. New to the forum
I have a Land Rover Defender 110 2005 with a Wabco ABS system on it.
The vehicle had been standing for a few months and the battery was flat. The customer jumped started the vehicle and had Handbrake warning light, ABS and Traction control lights on dash.
4 fault codes stored for Input/Output valves short circuit to ground.
We did continuity checks on the wiring and all is ok. We have changed the main Abs unit by the inner wing, fault still present.
We changed the ECU under the drivers seat. Coded in the new unit all ok. Chassis number is in the new unit. The traction control light is now off. The Abs light comes on with ignition, goes out but comes back on 2 seconds later. The handbrake/Fluid level red light is on permanently. We have checked the wiring, and found no fault. Tried another fluid reservoir to eliminate the fluid switch. Still on. No fault codes stored.
The Ecu must have had a fault as the codes have gone and traction light operating ok. I feel the hand brake light is the issue.
Can anyone supply and accurate wiring diagram or shed any light on my problem. Thanks
Click to expand...
I have exactly the same..
New abs modulator from ecu testing, brand new ecu under seat. nanocom says no faults even with lights on, snap on reader says no faults again. checked all wheel sensors and feed backs all good. can run pump motor and all valves from nancom. still bloody lights on.
drive it and jump on the brakes and you can feel the abs working.
when you say coded new ecu what / how do you do that?
 
justin king said:
I have exactly the same..
New abs modulator from ecu testing, brand new ecu under seat. nanocom says no faults even with lights on, snap on reader says no faults again. checked all wheel sensors and feed backs all good. can run pump motor and all valves from nancom. still bloody lights on.
drive it and jump on the brakes and you can feel the abs working.
when you say coded new ecu what / how do you do that?
Click to expand...
You are supposed to write the chassis number into the new ecu. We have Dec Superscan here, dont use it much nowadays but with the original ecu plugged int, it saves all info, then allows you time to swap the ecu then it trnasfers ingo accross to new ecu. But I think you can manually write the chassis number with Snap on.

Does your traction light go out?
 
justin king said:
hi, Yes TC goes out.
is there any config in the ecu under seat that needs transfering or should it work out the box?
Click to expand...
I'm pretty certain that when I save the data on the old unit, and the super scan tells you to switch units, it transfers more than just the chassis number. Maybe someone in here could confirm this.
I'm going to speak with a landrover tech later who might be able to confirm this. I'll let you know. If you find the problem on yours please post the fix and I'll do the same
 
Bng01 said:
I'm pretty certain that when I save the data on the old unit, and the super scan tells you to switch units, it transfers more than just the chassis number. Maybe someone in here could confirm this.
I'm going to speak with a landrover tech later who might be able to confirm this. I'll let you know. If you find the problem on yours please post the fix and I'll do the same
Click to expand...
of course, many thanks.
 
may help
MYSTERY DEFENDER TD5 02MY WARNING LIGHTS.png
C0287-location.jpg
 
Have you driven it? I think you need to get over 5mph on these for the abs light to go out
 
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