The 75 and ZT Owners Club Forums - View Single Post

BigRuss · 27th October 2019, 22:27

Possibly a transistor failure in the LSM, the bulb monitoring system works by keeping a low voltage that goes down each lighting circuit through the bulb and to one leg of the transistor monitoring that circuit.
Failure to register the voltage to that leg of the transistor will cause the bulb warning system to activate.

If you have access to a replacement one from another car try it and if the light goes out the LSM is faulty.

Russ

27th October 2019, 22:27	#6
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	Possibly a transistor failure in the LSM, the bulb monitoring system works by keeping a low voltage that goes down each lighting circuit through the bulb and to one leg of the transistor monitoring that circuit. Failure to register the voltage to that leg of the transistor will cause the bulb warning system to activate. If you have access to a replacement one from another car try it and if the light goes out the LSM is faulty. Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.