P38 Left hand indicators not working - BECM input/output - 1999 2.5 DSE

Hi all, having almost fixed the hippo, now having a mare with the p38 - left hand indicators have stopped working and MOT due (£$%***R££$!"er)

The right hand side indicators work fine - the hazards work fine on both left and right sides so builbs are fine - I suppose therfore that this must be a BECM fault - or the stalk - or the wire from stalk to BECM.

Handy links :
http://www.landy.ee/manuals/electricity/Electronic Troubleshooting Manual RR-P38 (LRL0086ENG).pdf
http://www.rangerovers.net/repairdetails/becm/
https://blackbox-solutions.com/help/SM022.html
http://www.rangerovers.net/forum/7-range-rover-mark-ii-p38/218498-p38-rave-one-pdf-file-tablet.html

Have done the research on the Electronic trouble shooting manual section H6 and find as follows for the
Left hand side indicators :

INPUT to BECM:
from pin12 of indicator stalk (x273) - wire colour GR - to pin7 of C1278 socket of BECM

Output from BECM: :
Left hand Rear indicator : From pin14 of C1291 - wire colour GR
Left hand repeater : From pin 6 or C1281 - wire colour WG
Left hand Front indicator: From pin 12 of C1281 - wire colour GR

Relevant fuse appears to be : F1 10A

I will check continuity on the GR coloured wire from stalk to becm
But I have not worked with becm before, my questions are:

Am I on the right track? When I test the inpiuts and outputs with a multimeter what voltages should I expect ?and what procedure is used to measure them?

thanks for any ideas and help

cheers

Rob

If they all work on hazards then it is certainly not the output side of the BECM.
What I would do is check which pin is the input signal for the working side, measure the voltage on that pin and then use a jumper wire to put that voltage to the pin for the non working side.
If they work its stalk/wiring. If they don't work it's BECM faulty.

ahhh of course - I'll do that - thanks Vmuch
I did make a RHS list for comparison - but didnt see the obvious last night )
According to electronic trouble shooter - if it helps someone :

RHS indocator :

Input to BECM
Fom pin 7 of indicator stalk (x273) - wire colour GW - to pin 2 of C1278 of BECM

and for completeness the
Output from BECM: :
Right hand Rear indicator : From pin 4 of C1283 (MY 1999) [or pin 4 of C1584 (MY 2000) ] - wire colour GW
Right hand repeater : From pin 14 of C1281 - wire colour WG
Right hand Front indicator: From pin 4 of C1282 - wire colour GW

Another thought in the possible clarity of the am :-
As I (amateurly) read the circuit - the indicator switch just gounds the pin on the input side of the BECM -
so I could just ground the input to BECM (pin7 of C1278) using my (just constructed!) jumper lead to any earth and if the indicators work then the fault is between the stalk and the BECM - ah.. same thing of course ..
hope its a wire and not a prob internal to the BECM .. havnt got time to get my soldering iron out today .. but that might be fun one day

thanks for the advice - really appreciated - I thnk I'm getting it now
off to play with new jumper lead

cheers )

Pop the hazard switch in n out a few times(switch it on n off) had them stick in the past ,

just found this pic help for indicator signal input to BECM :

Right hand side of BECM - C257 is C1278 (sockets apparently renamed 1999)

looking at Plug

Fixed Left hand indicator problem.
Thanks Wazzajnr and dubbleRR for your replies and Wazzajnr esp. for clarifying.
I butchered an old molex connector to extend pin 2 and pin 7 of C1278 out to a more workable position. Those pins look easily bent.

---------- BE CAREFUL AS PIN 6 ON C1278 IS IGNITION POSITION 3 = START THE CAR -------------- as I discovered

I connected pin 7 of stalk (fhe right hand indicators - which were working) into pin 7 of C1278 and the Left hand indicators worked - so not the BECM (phew! thanks again Wazzajnr)
Tested stalk switch - ok - Then a simple continuity test along the green/red wire to see where the break was. Turned out to be about halfway along the bottom of the door.
A little kink in the wire - no idea how that could have happened, its not exposed or anything. Mind you the wires are a bit bloody thin and unguarded for a "tough" motor.
Anyway thanks to you wonderful people on the internet - its fixed.
Pix : The culprit Green/red wire awaiting imminent reunion.

hmmmmmm there are some other kinks there ........ bugger

cheers all

Glad you got it sorted matey.

I was away to say you can find the relevant pin on the yellow connecter and put directly to earth that will be the input on the becm.

I went through the same yesterday
to diagnose my non wash wipe situation.