Interior Light Issue

SeansLandy · Nov 11, 2023

I have an issue with my interior light on my 1999 Defender TD5 it will turn on using the switch on the light but will not turn on when any of the doors are opend have checked;

- the wireing and there is no shorts and breaks
- have checked the door sensors and they all work
- have tried changeing some of the 10AS settings (see current settings below)

param;value
Time Error;NONE
Comms;SMART
Interior Light;NORMAL
Welcome Light;ENABLED
Arm/Disarm Flash;NO HAZARD
Arm/Disarm Confirm;HAZARD
Arm on Lock;DISABLED
Resync on Arm;ENABLED
Relock;DISABLED
Mislock;NOTED
Mislock Noise;ENABLED
Resync on Lock;ENABLED
Plip Immobilize;DISABLED
Plip Relock;DISABLED
Key Mobilize;DISABLED
Passive Immobilize;DISABLED
Key Disarm;DISABLED
C.D.L. When ARM;NONE
Flash on Alarm;NO FLASH
Alarm Sound;SINGLE
Time Sync.;USED
Low Battery Error;ENABLED
Battery Error;USE COUNT
Tamper Warn;YES
Cat. Overheat;DISABLED
Mems Failure Indic.;DISABLED
Vehicle;DEFENDER
Immobilizer;MEMS-TD5
Week;00
Year;1998
Serial Number;
Plip Easy Resync;002
Plip for Resync;004
Bad Plip Allowance;004
Plip for Low Battery;010
Plip 1;000
Plip 1;000
Plip 1;000
Plip 1;000
Plip 2;000
Plip 2;000
Plip 2;000
Plip 2;000
Plip 3;000
Plip 3;000
Plip 3;000
Plip 3;000
Plip 4;000
Plip 4;000
Plip 4;000
Plip 4;000
Plip Learnt;000
Volumetric Sens. g.;028
CAT Threshold;086
EKA Code;
EDC Code;
EGR-DDS Code;
GEMS Code;
TD5-MEMS Code;

does anyone have any idea how to fix this

Turboman · Nov 11, 2023

SeansLandy said:
I have an issue with my interior light on my 1999 Defender TD5 it will turn on using the switch on the light but will not turn on when any of the doors are opend have checked;

- the wireing and there is no shorts and breaks
- have checked the door sensors and they all work
- have tried changeing some of the 10AS settings (see current settings below)

param;value
Time Error;NONE
Comms;SMART
Interior Light;NORMAL
Welcome Light;ENABLED
Arm/Disarm Flash;NO HAZARD
Arm/Disarm Confirm;HAZARD
Arm on Lock;DISABLED
Resync on Arm;ENABLED
Relock;DISABLED
Mislock;NOTED
Mislock Noise;ENABLED
Resync on Lock;ENABLED
Plip Immobilize;DISABLED
Plip Relock;DISABLED
Key Mobilize;DISABLED
Passive Immobilize;DISABLED
Key Disarm;DISABLED
C.D.L. When ARM;NONE
Flash on Alarm;NO FLASH
Alarm Sound;SINGLE
Time Sync.;USED
Low Battery Error;ENABLED
Battery Error;USE COUNT
Tamper Warn;YES
Cat. Overheat;DISABLED
Mems Failure Indic.;DISABLED
Vehicle;DEFENDER
Immobilizer;MEMS-TD5
Week;00
Year;1998
Serial Number;
Plip Easy Resync;002
Plip for Resync;004
Bad Plip Allowance;004
Plip for Low Battery;010
Plip 1;000
Plip 1;000
Plip 1;000
Plip 1;000
Plip 2;000
Plip 2;000
Plip 2;000
Plip 2;000
Plip 3;000
Plip 3;000
Plip 3;000
Plip 3;000
Plip 4;000
Plip 4;000
Plip 4;000
Plip 4;000
Plip Learnt;000
Volumetric Sens. g.;028
CAT Threshold;086
EKA Code;
EDC Code;
EGR-DDS Code;
GEMS Code;
TD5-MEMS Code;

does anyone have any idea how to fix this

Welcome to LZ!

I never knew those even had door switches. I don't think my wife's did, or at least, if it did, they never worked.

I should think the simplest thing is just to use the switch on the light.

SeansLandy · Nov 11, 2023

i mean that is a option but its a feature i would like to fix/restore

Anaconda · Nov 12, 2023

Switch on the light in the wrong position?
I thought mine had stopped working which, indeed they had, forgot I switched them off!
They now come on when I press the button to turn off the alarm, as they should I presume.

SeansLandy · Nov 12, 2023

Anaconda said:
Switch on the light in the wrong position?
I thought mine had stopped working which, indeed they had, forgot I switched them off!
They now come on when I press the button to turn off the alarm, as they should I presume.

i have tries the switch on the light in all three positions and only comes on in one of the three positions (always on)

when you say the button to turn off the alarm do you mean the remote fob?

Anaconda · Nov 12, 2023

SeansLandy said:
i have tries the switch on the light in all three positions and only comes on in one of the three positions (always on)

when you say the button to turn off the alarm do you mean the remote fob?

Sorry, yes that is what I meant
Press remote, lights come on, unlock Landy with key, go through endless security, stick key in ignition, turn key, lights go off, drive away.

sierrafery · Nov 12, 2023

Hi, it's not a setting as it's by default so unplug the lamp and measure voltage across the purple(+) and purple/white(-) wires when you open a door, if you get voltage the problem is with the switch which doesnt close to the second contact which completes the automatic circuit(middle position)

I edited the relevant part of the diagram, the switch closes to earth on manual mode and on automatic must close the contact as in the pic for the light to come on... if no voltage when the lamp is supposed to be on autamatically we'll speak again

SeansLandy · Nov 12, 2023

have checked the voltage of the bulb remains the same weather the is door open or closed but the light doesnt come one even thought voltage is the same as when the light is on with the switch to perminant earth, am going to borrow a light from another defender with a switch that is known to be working in the next couple of days see if that fixes the issue

EricTuk · Feb 10, 2024

Hi, I have a similar issue; the interior light switch only works when “on” or middle position, but doesn't go off. The door switches don’t seem to do anything. The alarm also beeps x2 when locking and so I’ve checked all the door switches and bonnet switch just in case, but the interior light just stays on until the 8 mins has elapsed.
Not sure if this is an alarm thing or something simple, like a door switch operating, but they seem to be working as I’ve held them closed for the 15secs +…
Anyone any ideas?
Eric

sierrafery · Feb 10, 2024

Hi, based on that

EricTuk said:
The alarm also beeps x2 when locking

which means that the input to the ECU is that a door or bonnet is opened and the interior lights are working on that mode only so if you are 100% certain that all the switches are OK there is a short to earth somewhere on that circuit

EricTuk · Feb 22, 2024

EricTuk said:
Hi, I have a similar issue; the interior light switch only works when “on” or middle position, but doesn't go off. The door switches don’t seem to do anything. The alarm also beeps x2 when locking and so I’ve checked all the door switches and bonnet switch just in case, but the interior light just stays on until the 8 mins has elapsed.
Not sure if this is an alarm thing or something simple, like a door switch operating, but they seem to be working as I’ve held them closed for the 15secs +…
Anyone any ideas?
Eric

Update: Fault found to be n/s rear door light switch damaged wiring. This was revealed on removing the door light switch and pulling the wiring through, only to find it faulty. Re made the circuit and checked out ok. Also had to reprogram the alarm system as it had gotten into a fault loop…( re programming done by LR specialist with appropriate diagnostics).

Interior Light Issue

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