Hazard warning lights will not stop. -scrap car!

Trans-am · 30th April 2016, 07:44

Hi Guys.

Quick question.
My hazard warnings will not stop. (yes i have searched the forum and nothing seems to match what i have)

Diagnosis so far.

I removed the fuse to depressurize the fuel system and the hazard warning lights came on. I just assumed it was the car telling me the fuel pressure was gone. When i put the fuse back they will not turn off. I have removed EVERY fuse in the passenger fuse box, still flashes! I have cut the wires to the LSM from the hazard switch and they still flash. Only if i remove under bonnet FL 9 and FL11 (both 50 amp) does it stop. These two isolate the LSM. So i removed the LSM its self and it stops.
Every system on the car works fine, all the lights, horn, it drives, its NOT failed over to emergency LSM (by illuminating the head and tail lights). It locks, unlock everything works, its just the hazards flash.

This tells me that the LSM makes the hazards flash, BUT and this is the crucial thing i do not know if there is a fault or if another of the cars systems is sending the signal to the LSM to make it flash!

Background
I have a 1999/2000 (W) Rover 75 1.8. It is one owner and has covered 40,000 miles with full service history. My mate is a scrappy and he got it, he was going to scrap it but i saved it from the crusher. Its had pretty much every Rover issue. I used the articles on this forum to replace the inlet green gasket, then the carpets flooded and i had to take the entire interior out, then the head gaket popped at 40,000. I have just done the head gasket, timing belt and water pump.
I am now faced with an electrical fault...

I am desperate not to scrap a 1 owner car with 40,000 miles, FSH, new timing belt, water pump, MLS gasket and new bolts. But i have to draw the line somewhere.

rich17865 · 30th April 2016, 09:44

Sounds like you might have activated the fuel cut off switch.

Trans-am · 30th April 2016, 11:02

Quote:

Originally Posted by rich17865

Sounds like you might have activated the fuel cut off switch.

I wish! I will check that, but I assumed as it starts and runs that's not the case. Because logically the cut off cuts of the fuel supply?

If anyone lives near basing stoke, reading or Newbury and has a lsm I can try I would be most grateful! :-)

SD1too · 30th April 2016, 13:02

Your LSM may well be working perfectly Simon. According to MG Rover's manual, the hazard warning switch switches one of the LSM's terminals to earth momentarily and it is latched electronically by the LSM. Try unplugging the hazard switch in case it is presenting the LSM with a continuous earth.

You say that you have removed every fuse in the passenger compartment fusebox, but did you check that they were all intact?

The likelihood is that something happened when you removed or refitted the fuse feeding the fuel pump. By the way, I can't see how that would make any difference to any residual pressure in the fuel lines so I'd leave it alone in future if I were you.

Simon

cb750chris · 30th April 2016, 18:33

Hi Simon
If you can't find anybody nearer to you, give me a shout and I can have a look with/for you. I have a spare light switch I can for in to your car if needed, and can look at the problem with the diagnostic tools too.
I am down in Fareham, so about an hour from you.
Chris

klarzy · 30th April 2016, 19:03

Simon....

disconnect the battery for 30 mins...

Trans-am · 30th April 2016, 19:45

Quote:

Originally Posted by SD1too

Your LSM may well be working perfectly Simon. According to MG Rover's manual, the hazard warning switch switches one of the LSM's terminals to earth momentarily and it is latched electronically by the LSM. Try unplugging the hazard switch in case it is presenting the LSM with a continuous earth.

You say that you have removed every fuse in the passenger compartment fusebox, but did you check that they were all intact?

The likelihood is that something happened when you removed or refitted the fuse feeding the fuel pump. By the way, I can't see how that would make any difference to any residual pressure in the fuel lines so I'd leave it alone in future if I were you.

Simon

Yes every fuse intact. So I was following the procedure to change the head gasket, step 2 or 3 is to depressiure the fuel system. I didn't just do it for fun! I was following the book.
Other reply's;
I have also just confirmed the inerta switch. Was not activated, proven by the fact the car runs and the interior lights are not fully on.
Battery has been disconnected for about a week. The lsm when removed stops the flahsing, but obviously it may not be causing it. NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-! :-)
I cut the wires to the lsm from the hazard switch, so it can not be a hazard switch fault.

Hi Chris, how much do you charge? It's the lsm I think i need to swap as a test. I could buy one from a local scrappy I suppose! :-)

Trans-am · 30th April 2016, 19:47

Quote:

Originally Posted by Trans-am

Yes every fuse intact. So I was following the procedure to change the head gasket, step 2 or 3 is to depressiure the fuel system. I didn't just do it for fun! I was following the book.
Other reply's;
I have also just confirmed the inerta switch. Was not activated, proven by the fact the car runs and the interior lights are not fully on.
Battery has been disconnected for about a week. The lsm when removed stops the flahsing, but obviously it may not be causing it. NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-! :-)
I cut the wires to the lsm from the hazard switch, so it can not be a hazard switch fault.

Hi Chris, how much do you charge? It's the lsm I think i need to swap as a test. I could buy one from a local scrappy I suppose! :-)

Struth! The naughty word was another word for the thing you sit on. Not exactly the c word!

berkshirelad · 3rd May 2016, 13:53

Quote:

Originally Posted by Trans-am

I wish! I will check that, but I assumed as it starts and runs that's not the case. Because logically the cut off cuts of the fuel supply?

If anyone lives near basing stoke, reading or Newbury and has a lsm I can try I would be most grateful! :-)

I'm in Newbury and I have a spare LSM. PM me with an address if you'd like me to pop by

Hazards are switched (both off and on) by a momentary earth to the LSM via the hazard switch.

You can test the switch by removing the switch and unplugging the 2 pin connector. Earthing the connector pin should switch the hazards on and off. When I got mine, the hazards didn't work at all and I found that the switch has no earth connection.

Trans-am · 3rd May 2016, 20:10

Quote:

Originally Posted by berkshirelad

I'm in Newbury and I have a spare LSM. PM me with an address if you'd like me to pop by

Hazards are switched (both off and on) by a momentary earth to the LSM via the hazard switch.

You can test the switch by removing the switch and unplugging the 2 pin connector. Earthing the connector pin should switch the hazards on and off. When I got mine, the hazards didn't work at all and I found that the switch has no earth connection.

You know something Berkshirelad. I am straight. But i have a kiss for you, maybe a bear hug as well. You solved it. T H A N K Y O U.

I cant tell you what a ball ache this has been. I tried touching the two feeds together to the hazards from the LSM, but i never thought about grounding them! The moment i grounded them, light OFF!!!!! - YES!

I now have to fix all the stuff i took apart to troubleshoot this, I also have to service the car and get it back on the road, lets hope the head gasket does not pop! - its had 0 mileage since being done.

Chris, thanks for your offer of help. In the end i got a LSM on ebay for £7.50 delivered! - but it wont arrive till next week. - But i dont need it now!

I have been driving my 1967 S-type Jag everyday so its not been all bad, but this has taken time away from restoring my Trans-am and Drag racing hearse.

I will try to get the Rover undersealed this summer, i think she may have afew more winters in her! ;-)

T H A N K Y O U -all.

30th April 2016, 07:44	#1
Trans-am Newbie Rover 75 Join Date: Apr 2016 Location: Basingstoke Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts	Hazard warning lights will not stop. -scrap car! Hi Guys. Quick question. My hazard warnings will not stop. (yes i have searched the forum and nothing seems to match what i have) Diagnosis so far. I removed the fuse to depressurize the fuel system and the hazard warning lights came on. I just assumed it was the car telling me the fuel pressure was gone. When i put the fuse back they will not turn off. I have removed EVERY fuse in the passenger fuse box, still flashes! I have cut the wires to the LSM from the hazard switch and they still flash. Only if i remove under bonnet FL 9 and FL11 (both 50 amp) does it stop. These two isolate the LSM. So i removed the LSM its self and it stops. Every system on the car works fine, all the lights, horn, it drives, its NOT failed over to emergency LSM (by illuminating the head and tail lights). It locks, unlock everything works, its just the hazards flash. This tells me that the LSM makes the hazards flash, BUT and this is the crucial thing i do not know if there is a fault or if another of the cars systems is sending the signal to the LSM to make it flash! Background I have a 1999/2000 (W) Rover 75 1.8. It is one owner and has covered 40,000 miles with full service history. My mate is a scrappy and he got it, he was going to scrap it but i saved it from the crusher. Its had pretty much every Rover issue. I used the articles on this forum to replace the inlet green gasket, then the carpets flooded and i had to take the entire interior out, then the head gaket popped at 40,000. I have just done the head gasket, timing belt and water pump. I am now faced with an electrical fault... I am desperate not to scrap a 1 owner car with 40,000 miles, FSH, new timing belt, water pump, MLS gasket and new bolts. But i have to draw the line somewhere.

30th April 2016, 13:02	#4
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,382 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Your LSM may well be working perfectly Simon. According to MG Rover's manual, the hazard warning switch switches one of the LSM's terminals to earth momentarily and it is latched electronically by the LSM. Try unplugging the hazard switch in case it is presenting the LSM with a continuous earth. You say that you have removed every fuse in the passenger compartment fusebox, but did you check that they were all intact? The likelihood is that something happened when you removed or refitted the fuse feeding the fuel pump. By the way, I can't see how that would make any difference to any residual pressure in the fuel lines so I'd leave it alone in future if I were you. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 30th April 2016 at 13:26..

30th April 2016, 18:33	#5
cb750chris Trader Rover 75 Tourer Join Date: Apr 2011 Location: Portsmouth Posts: 849 Thanks: 201 Thanked 292 Times in 200 Posts	Hi Simon If you can't find anybody nearer to you, give me a shout and I can have a look with/for you. I have a spare light switch I can for in to your car if needed, and can look at the problem with the diagnostic tools too. I am down in Fareham, so about an hour from you. Chris __________________ Now offering T4 services in the Fareham area Replacement keys programmed / supplied / cut Diesel 135 upgrade available IPK virginisation and T4 matching available Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.

30th April 2016, 19:03	#6
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Simon.... disconnect the battery for 30 mins... __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

30th April 2016, 09:44	#2
rich17865 This is my second home Transit Connect Join Date: Feb 2011 Location: Crewe Posts: 9,532 Thanks: 868 Thanked 1,619 Times in 1,095 Posts	Sounds like you might have activated the fuel cut off switch.