ABS Message

milford man · 10th April 2016, 10:45

Hi I have had an ABS random fault message for the last couple of years. This is the original thread http://www.the75andztclub.co.uk/foru...ight=abs+light

Its now got worse but has given more of a clue. It only seemed to do it in the wet. Well I finally got a clue why. Never saw the connection before but now its worse I can. Now for every 3 times the wipers do a sweep 2 of them brings on the ABS light and fault message. Its not exactly 2 out of 3 it can vary. So is the activation of the wiper motor causing a K-bus fault?

The only connection I can see between the ABS and wipers is the K-bus. Could the wiper motor be generating back emf or a spike or is it a problem with the BCM? Anybody got any ideas?

Regards John

milford man · 10th April 2016, 21:04

Anybody?

Regards John

milford man · 11th April 2016, 14:56

If I fitted a second hand BCU temporarily. Would it work to prove if this was the fault or not. I know the C/L would not work but trying to eliminate things.

Regards John

milford man · 11th April 2016, 21:43

Bump.

Regards John

Greeners · 11th April 2016, 23:53

K-bus sounds like a probably cause, Check the earths at the bottom of the A pillar

Failing that a T4 session is probably the best way to go.

milford man · 12th April 2016, 07:59

Thanks David. No faults showed on a T4 but I will check earths at the bottom of the A pillar.

Regards John

milford man · 12th April 2016, 13:11

Checked earths with digital multimeter very low resistance. Checked fault codes again LSM showing "Brake Light Switch Short to Ground" fault count 2. I don't know if this is the footbrake switch or handbrake.

Regards John

Greeners · 12th April 2016, 22:22

It's probably the foot brake switch.

Pull the LSM out and check for damage

trikey · 12th April 2016, 22:34

Any water anywhere? This tends to upset a lot of things on the canbus line.

milford man · 12th April 2016, 22:37

Can't see any water but who knows what goes on in the hidden places. No obvious damage to LSM or switch. I have fitted a new foot brake switch just in case. What a job!!

Regards John

10th April 2016, 10:45	#1
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	ABS Message Hi I have had an ABS random fault message for the last couple of years. This is the original thread http://www.the75andztclub.co.uk/foru...ight=abs+light Its now got worse but has given more of a clue. It only seemed to do it in the wet. Well I finally got a clue why. Never saw the connection before but now its worse I can. Now for every 3 times the wipers do a sweep 2 of them brings on the ABS light and fault message. Its not exactly 2 out of 3 it can vary. So is the activation of the wiper motor causing a K-bus fault? The only connection I can see between the ABS and wipers is the K-bus. Could the wiper motor be generating back emf or a spike or is it a problem with the BCM? Anybody got any ideas? Regards John

11th April 2016, 23:53	#5
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	K-bus sounds like a probably cause, Check the earths at the bottom of the A pillar Failing that a T4 session is probably the best way to go. __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

12th April 2016, 22:22	#8
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	It's probably the foot brake switch. Pull the LSM out and check for damage __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

12th April 2016, 22:34	#9
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,771 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Any water anywhere? This tends to upset a lot of things on the canbus line. __________________ Lest we forget..

10th April 2016, 21:04	#2
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	Anybody? Regards John

11th April 2016, 14:56	#3
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	If I fitted a second hand BCU temporarily. Would it work to prove if this was the fault or not. I know the C/L would not work but trying to eliminate things. Regards John

11th April 2016, 21:43	#4
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	Bump. Regards John

12th April 2016, 07:59	#6
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	Thanks David. No faults showed on a T4 but I will check earths at the bottom of the A pillar. Regards John

12th April 2016, 13:11	#7
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	Checked earths with digital multimeter very low resistance. Checked fault codes again LSM showing "Brake Light Switch Short to Ground" fault count 2. I don't know if this is the footbrake switch or handbrake. Regards John

12th April 2016, 22:37	#10
milford man Gets stuck in Jaguar XE Prestige Join Date: Oct 2010 Location: Coventry Posts: 540 Thanks: 155 Thanked 109 Times in 101 Posts	Can't see any water but who knows what goes on in the hidden places. No obvious damage to LSM or switch. I have fitted a new foot brake switch just in case. What a job!! Regards John