Diagnostic System failures...confused!!

Datatek said:

Wonderful, on bulb failure and the whole electronics system is fecked. Time to burn it.

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Sounds like an expensive blow job...

This isn't an article I want to be reading while thumbing through L322 classifieds. Best of luck hunting down the culprit gents. No doubt it'll be the most awkward bastard of an ECU to access when you find out what is kicking off.

Bix said:

This isn't an article I want to be reading while thumbing through L322 classifieds. Best of luck hunting down the culprit gents. No doubt it'll be the most awkward bastard of an ECU to access when you find out what is kicking off.

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Or if it was a high voltage spike from the HIDeous igniter it could be all of them.

Datatek said:

Or if it was a high voltage spike from the HIDeous igniter it could be all of them.

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This is a scenario I don't want to think about!!

The legend that is Storey Wilson has emailed back stating this is a tricky one....

I hope he won't mind me quoting his email:

'...Your problem sounds more difficult than usual....'

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All I can do is try!

Saint.V8 said:

This is a scenario I don't want to think about!!

The legend that is Storey Wilson has emailed back stating this is a tricky one....

I hope he won't mind me quoting his email:



All I can do is try!

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One day you come to agree with me Ant, the L322 is a HOS.

Datatek said:

Or if it was a high voltage spike from the HIDeous igniter it could be all of them.

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If that's the case then what a terrible design!

I wonder if putting some inversed-series 18-20v zener diodes across the load or a proper transorb diode on the power supply to the HID igniters could stop any future reverse spikes? I suspect Datatek is the man to tell me I'm talking out of my arse here!

Transient-voltage-suppression diode - Wikipedia, the free encyclopedia

StuckAgainSteve said:

If that's the case then what a terrible design!

I wonder if putting some inversed-series 18-20v zener diodes across the load or a proper transorb diode on the power supply to the HID igniters could stop any future reverse spikes? I suspect Datatek is the man to tell me I'm talking out of my arse here!

Transient-voltage-suppression diode - Wikipedia, the free encyclopedia

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It would help, personally I'd retro fit proper tungsten filament headlights.

Datatek said:

It would help, personally I'd retro fit proper tungsten filament headlights.

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If I manage to get to the bottom of this, I may just think about this....but it could be a minefield to retrofit....will have to research further.

keep at it saint, i feel your pain brother :boom:

Saint.V8 said:

If I manage to get to the bottom of this, I may just think about this....but it could be a minefield to retrofit....will have to research further.

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I could sort of understand it if we were talking about a retro fitted HID kit, have seen stories about wiper motors being knocked out, but in a factory setup?? Could a dodgy ballast be the route cause for a voltage spike?

I doubt this is a common problem whenever a lamp fails

The lamps wouldn't usually explode when they fail

Could be a faulty ballast that caused it

wow. this is a nightmare.

if I can help...let me know.

Saint.V8 said:

If I manage to get to the bottom of this, I may just think about this....but it could be a minefield to retrofit....will have to research further.

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Tungsten filament headlights were fitted as standard on some L322's one of my mates cars has them, so shouldn't be difficult apart from telling the BCU.

What year & model do you have?

Rick-the-Pick said:

What year & model do you have?

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Hi Rick.... 2003 4.4 Vogue Adriatic Blue etc etc

Yep
Can just change the setting within the Light control module ECU

Can do it on my fault mate

God knows why you would want crappy halogens though

It does sound like a canbus fault. These faults are bast**ds as you have to chase the fault to the instrument binnacle. I'm not sure these after market systems can do this.
Faultmate or T4 job.

This evenings fun and frolics....

Took the opportunity to have a go at some fuse removal, each fuse listed below was removed one at a time and each time I tried to connect to the diagnostics....

RED = K Bus, BLUE = I Bus, Green = CAN Bus Orange = P Bus Purple = Diagnostic DS2 Bus

F1 - Instrument pack
F1 + F45 +F46 - Instrument Pack
F5 - Diagnostics, Automatic Transmission ECU
F6 - PDC ECU
F8 - Audio and Telephone
F9 - Light Check Module
F11 - Drivers Door Module
F12 + F34 + F52 - HeVAC unit
F15 - BCU, Diagnostics......Although didn't do the All Comms test as on removing this fuse all the interior lights went out and the Alarm BBus sounded....thought better put this one back!
F17 - BCU, Interior Lights....this one was found to be blown, replaced with another 5A fuse, but still no Diagnostics
F18 - Steering Lock ECU and Engine immobiliser.....with it out, I couldn't turn the ignition key so couldn't try diagnostic connection, on reconnection of fuse I couldn't turn key and it took me 5 minutes to get the key to turn in the steering lock!
F20 - LH Seat Switch Pack
F21 - RH Seat Switch Pack
F22 - Telephone
F24 Passanger Door Module
F27 - BCU....lights went out again but no alarm, still no diagnostics!
F31 - Engine ECU, Steering Lock ECU....with it removed, I couldn't turn key again!
F32 - RH and LH Xenon Lamps
F33 - Transfer Box ECU
F41 - BCU and Rain Sensor
F49 - Audio System ..... must wait 3 minutes for the system to sleep before removing this one!
F51 - ABS ECU, Secondary Air Injection and Steering angle Sensor
F54 - Automatic gearbox ECU
F55 - ABS ECU
F57 - EAS ECU (EAS ECU is on the K and CAN Buses)
F58 - Sunroof ECU
F60 - BCU

Instrument Pack is the Gateway to all the Buses bar the ISO 9141 Diagnostics Bus as this has to remain totally separate to the rest by law
P Bus items are connected to the BCU
Engine & Gearbox are also on the ISO 9141 K Line Diagnostics Bus
ABS, Steering Angle Sensor are also on the Diagnostic DS2 Bus
Didn't dare unplug the SRS ECU for fear of faults that I can't clear as yet.

All to no avail....still no further forward, and still no diagnostics...

Might be time to physically unplug each one now - what a ball ache as they are usually buried under the dash and behind trim that is bound to get broken after never being moved for 11 years!

Ho hum, the joys of Range Rover ownership!

try the SRS ECU, you'll be fine

my ECU was getting damp from water entering the pollen filter intake and running down the pipe work and onto the ECU buried under the handbrake.

its worth a try, the SRS faults are self resetting anyway if the fault isn't present


Good luck

hi saint, i have skimmed through this thread so apologies if this has already been ruled out, (i admit i am way out of my depth here)but does the instrument cluster disco lights not narrow down your search as in what controls them?

i lost all my turn signals, warning lights, indicator tick before and i disconnected / connected the instrument cluster and everything came back

i am guessing you have done the system reset by disconnecting battery, the range equivalent to turning it off and back on again i think

i subscribed to the link below which gives me access to all the landrover TSBs, i dont think it was mega money for the year but you can sign up for a month

About Mitchell 1 DIY, Company Information

i have found the the most pleasure of owning a range rover comes from when you finally work out whats wrong with the fecker above anything else

keep the faith