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1996 Defender 300 TDi Alarm/Immobiliser problem

 
 
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ianc2051
Just got MTs


Joined: 22 Feb 2009
Odometer: 174
Location: Weare Giffard, N. Devon



PostPosted: Sun Dec 22, 2013 11:44 pm    Post subject: 1996 Defender 300 TDi Alarm/Immobiliser problem Reply with quote

Well I'm now down to fixing the smaller niggling issues having fitted a galvanised chassis, new calipers/discs and new rear wiring loom. The car was bought with just one plip key for arming/disarming the alarm/immobiliser which didn't work but now does - in a fashion.

If I plip to arm the alarm/immobiliser, the indicators flash to acknowledge that the operation was carried out, but when I plip to disarm, there is no indication that anything has happened. The reality is that the plip does arm and disarm but I would like to get to the bottom of why no indication on the disarm bit.

Any help of where to start would be appreciated.
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big_ears
Winch Assistant


Joined: 20 Apr 2004
Odometer: 50
Location: Nuneaton



PostPosted: Tue Dec 24, 2013 2:50 pm    Post subject: Reply with quote

Try changing the batteries in the plip. With my Td5 90 it says in the owners manual that if the indicators don't flash when opening the doors/disabling the alarm then the batteries need replacing. I know yours is an older model and the plip only operates the alarm but it might have the same low battery warning function.

Ian.
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ianc2051
Just got MTs


Joined: 22 Feb 2009
Odometer: 174
Location: Weare Giffard, N. Devon



PostPosted: Tue Dec 24, 2013 10:09 pm    Post subject: Reply with quote

Hi Ian - thanks for the reply, I'm also an Ian.

I discovered that I had a spare battery for the plip which was an identical new one for use in an illuminated rifle scope. As it has been hanging around for some years I checked the voltage before fitting it - 3.3 volts, the old one was about 2.9 volts (should be a nominal 3 volts). Unfortunately it has made no difference.

Grasping at straws, the electronics box fitted behind the instrument panel which I'm only guessing is the alarm box is electrically connected but is not actually secured - it is just lying there snuggly in place without bolts/screws etc. Could this be an earthing issue which could be solved by securing it in to place properly, or is this box nothing to do with the fault?

I forgot to say on the initial enquiry that I do get some indication that the system has armed through the interior lights which are on a short timer when the doors are closed (that is they stay on for a few seconds). Having plipped to arm, the lights go out immediately. So some elements work whilst others don't.

If I only knew how the system worked, I could probably get to grips with diagnosing the fault.
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big_ears
Winch Assistant


Joined: 20 Apr 2004
Odometer: 50
Location: Nuneaton



PostPosted: Thu Dec 26, 2013 7:25 pm    Post subject: Reply with quote

Hi Ian, sorry that didn't help but it was worth a try. I don't know much about these alarm systems. I'm sure someone more knowledgeable will be along to help before long.

Hope you get it sorted, Ian.
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big_ears
Winch Assistant


Joined: 20 Apr 2004
Odometer: 50
Location: Nuneaton



PostPosted: Thu Dec 26, 2013 7:25 pm    Post subject: Reply with quote

Hi Ian, sorry that didn't help but it was worth a try. I don't know much about these alarm systems. I'm sure someone more knowledgeable will be along to help before long.

Hope you get it sorted, Ian.
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Grant B
Articulating


Joined: 09 Nov 2006
Odometer: 984
Location: Falkirk, Scotland



PostPosted: Fri Jan 03, 2014 9:24 pm    Post subject: Reply with quote

Hi,

This is from the Defender electrical manual. It might help a bit in testing/faultfinding/understanding.

"OPERATION

Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Current flows through fuseable link 1 and fuseable link 2 of the engine compartment fuse box, which are connected in parallel. Fuseable link 1(C907-1) supplies a constant battery feed to:
• The BBUS (C666-2) on a black wire
• Fuse 21 (C965-1) on a brown wire
• Pin 86 (C964-30) of the alarm sounder relay on a brown wire
• Pin 30 (C964-30) of the alarm sounder relay on a brown wire
• The anti theft alarm LED (C240-2) on a brown wire

Fuseable link 2 (C907-2) supplies a feed to:
• The ignition switch (C028-1) on a brown wire
• The starter relay (Cc151-87) on a brown wire
• Fuse 1 (C580-1) of the passenger compartment fuse box on a brown wire
• Fuse 2 (C580-3) of the passenger compartment fuse box on a brown wire


ALARM

Fuse 21 (C965-2) supplies a constant battery feed to the alarm ECU (C061-25) on a brown wire. The alarm ECU is supplied a permanent earth (C057-11) by a black wire. The alarm ECU (C057- also receives a constant battery feed from fuse 1 of the passenger compartment fuse box (C580-2) on a purple wire. This feed is then used to power the hazard warning lamps (C057-1 & C057-6).

When the vehicle alarm has been armed, the alarm ECU receives a number of inputs. The RH door switch (C057-1) is connected to the alarm ECU (C061-5) by a slate/white wire. When the door is closed, the switch is open. In this condition, the alarm ECU (C057-5) supplies the BBUS (C666-3) with battery voltage. When the door is opened, the switch opens, providing a route to earth. The alarm ECU responds by supplying the BBUS with a reduced voltage. Sensing this drop in voltage, the BBUS sounds.

The same principle is true of the LH door switch, and the bonnet switch. The left hand door switch (C033-1) is connected to the alarm ECU (C061-16) by a purple/blue wire, and the bonnet switch (C007-2) is connected to the alarm ECU (CC061-9) by an orange/blue wire. The bonnet switch is earthed (C007-1) on a black wire. Both interact with the BBUS in exactly the same way as the RH door switch.

In addition to being supplied with a constant battery feed (C666-2) the BBUS also has its own internal power supply, and is earthed (C666-4) on a black wire.

The alarm ECU (C061-20) also provides a feed for the ultrasonic modules (C359-1 & C889-1) on black/brown wires. The modules are earthed (C359-2 & C889-2) on black wires. When the modules detect movement, they supply the alarm ECU (C061-3) with a short series of pulses on a white/black wire. Once the alarm ECU detects these pulses, the BBUS is again sounded.

To disarm the alarm system, the RF handset is used. The signal transmitted by the handset is received by the Arial. The Arial is connected to the alarm ECU (C061-26) by an orange/slate wire.

The anti theft alarm LED is used as a visual deterrent, and is connected to the alarm ECU (C057-4) by a pink wire. To illuminate the LED, the alarm ECU provides a route to earth (C057-11). To extinguish the LED, the ECU provides it (C240-1) with a voltage equal to that provided by fuseable link 1. As the potential difference across the LED is now 0 volts, the LED is extinguished. In this way, the ECU can control the flashing sequence of the LED.

The alarm ECU also controls the interior lights. The ECU (C061-1) provides a feed to the interior lamp unit (C357-1) on a purple/white wire. This informs the lamp unit to extinguish the interior lamps. When the interior lamp unit receives a reduced feed from the alarm ECU, it illuminates the interior lamps.

The alarm and immobilisation systems can be interrogated through the diagnostic socket (C040-, which is connected to the alarm ECU (C061-17) by an orange/light green wire."



Good Luck!!!
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