Faulty light switch module

johnpilky · 3rd November 2020, 16:34

Hi all have got a faulty light switch module mgzt 160.it is leaving the highline brakelight on and the two rear brake lights.does anyone on here repair these lsm's.regards

raykay · 3rd November 2020, 17:19

Check the brake pedal switch. The tang of the pedal needs to be in close contact with the switch. It is a Hall effect switch and senses the proximity of the tang, if it cannot, the brake lights are switched on.

johnpilky · 3rd November 2020, 17:43

Quote:

Originally Posted by raykay

Check the brake pedal switch. The tang of the pedal needs to be in close contact with the switch. It is a Hall effect switch and senses the proximity of the tang, if it cannot, the brake lights are switched on.

Not brake pedal switch it has been checked by mg mechanic it is lsm.just trying to source one off here,they are over £100 on rimmers.does anyone have a spare one it's the one without xenon headlights

raykay · 3rd November 2020, 18:59

There needs to be a 12v ignition feed on pin 25 - Green/Purple cable - of the LSM connector from pin 4 of the switch connector, (12v feed, brake lights off - no voltage, brake lights on). As the switch is OK, it could be a break in the cable.

COLVERT · 3rd November 2020, 19:13

Quite often the pins on the light switch module plug and socket cause problems.---Need to be cleaned of any slight corrosion.--

Worth a check.

trikey · 3rd November 2020, 19:17

Check fuse 13

johnpilky · 3rd November 2020, 21:24

Thanks for the replies

johnpilky · 4th November 2020, 08:39

Quote:

Originally Posted by johnpilky

Thanks for the replies

Mechanic put a different lsm on car without the foglight function so it is throwing a fault up on dash so it is not the fuse can anyone on here supply one for mgzt 160,regards

raykay · 4th November 2020, 09:06

What fault? Are the brake light still on with the different LSM?

COLVERT · 4th November 2020, 10:59

Quote:

Originally Posted by raykay

What fault? Are the brake light still on with the different LSM?

A different LSM will show up as a fault as it has to be T4d to the car.---

3rd November 2020, 16:34	#1
johnpilky Loves to post mg zt 160+ Join Date: Jun 2009 Location: wigan Posts: 398 Thanks: 55 Thanked 14 Times in 12 Posts	Faulty light switch module Hi all have got a faulty light switch module mgzt 160.it is leaving the highline brakelight on and the two rear brake lights.does anyone on here repair these lsm's.regards

3rd November 2020, 18:59	#4
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	There needs to be a 12v ignition feed on pin 25 - Green/Purple cable - of the LSM connector from pin 4 of the switch connector, (12v feed, brake lights off - no voltage, brake lights on). As the switch is OK, it could be a break in the cable. Last edited by raykay; 3rd November 2020 at 19:03..

3rd November 2020, 19:17	#6
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,774 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Check fuse 13 __________________ Lest we forget..

3rd November 2020, 17:19	#2
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	Check the brake pedal switch. The tang of the pedal needs to be in close contact with the switch. It is a Hall effect switch and senses the proximity of the tang, if it cannot, the brake lights are switched on.

3rd November 2020, 19:13	#5
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Quite often the pins on the light switch module plug and socket cause problems.---Need to be cleaned of any slight corrosion.-- Worth a check.

3rd November 2020, 21:24	#7
johnpilky Loves to post mg zt 160+ Join Date: Jun 2009 Location: wigan Posts: 398 Thanks: 55 Thanked 14 Times in 12 Posts	Thanks for the replies

4th November 2020, 09:06	#9
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	What fault? Are the brake light still on with the different LSM?