Location of AHL amd YRS ECU

**plasma** · 23rd August 2018, 22:52

ok, forget the bcm then, as the fuel gauge not moving tells me there is no comms to the engine ecu. even if the immobilser was on you would still have a fuel gauge working..

you could in theory bypass the ehps and abs units as they dont strictly need to be incircuit for the car to crank and start.. you would need to link the highspeed canbus together to complete the loop as it passes in and out of both of these units.

from the cim the highspeed goes to the x1 left footwell connector (only goes to yaw rate if dash loom is specc'd and car has it.. from there it goes to the ABS unit out of the abs unit then to the big connector mounted on the scuttle panel near the abs unit, from that connector it then bobs along in two directions, one to the x4 connector mounted near the offside crush can, and from there to one of the two main plugs on the diesel fuel pump.. and the other direction (not looped) is to the power steering pump....

hopefully that gives you some more points of testing.

**Ben Hughes** · 24th August 2018, 08:35

Thank you Plasma:

Just to clarify

Where exactly is the left footwell connector - is it in he transmission tunnel housing or on the base of the A post.

I ran two new wires direct from HS can bus (pins 5 and 6) from the CIM to ECU - made no difference still just a click etc - when you say loop the ABS pump - does the signal need to go through the ABS pump

What ohms resistance reading should I expect on the ECU HS Canbus pins once I have taken the ABS and EHPS pump out?

The HS can bus enters the ECU in the RH facing connector

I will go back and have another go Tuesday.

**plasma** · 24th August 2018, 08:46

for the left hand connector in the footwell you have to remove the left lower trim (2 x t20 screws) you'll see a big connector with a pull down handle (sits below the bcm)

The ABS pump does have an in and out, so if you disconnect the ABS pump you'll have to bridge the wiring out in the loom plug... No idea on what resistance readings you would get if you do that as never had to delve that far into it....

When you connected your own two wires for the HS Can do you recall seeing the fuel gauge move?

**sulten** · 24th August 2018, 17:14

Originally Posted by Ben Hughes

Thank you Plasma:

Just to clarify

Where exactly is the left footwell connector - is it in he transmission tunnel housing or on the base of the A post.

I ran two new wires direct from HS can bus (pins 5 and 6) from the CIM to ECU - made no difference still just a click etc - when you say loop the ABS pump - does the signal need to go through the ABS pump

What ohms resistance reading should I expect on the ECU HS Canbus pins once I have taken the ABS and EHPS pump out?

The HS can bus enters the ECU in the RH facing connector

I will go back and have another go Tuesday.

Yes the X1 connector is behind the cower at the base of the A-pilar.
A typical end of loop resistor for CAN bus is 120 ohm, a complete loop with 2 EOL resistors will be 60 ohm.

**Ben Hughes** · 30th August 2018, 19:09

Hi Guys,

thank you for your help and replies last weekj i was able to spend some more time on the signum today - still no starting. justa click and same fault codes etc

I tested the resistance on the High Frequency Canbus wires at the ECU connector which I have isolated and looped form every other module in this canbus circuit. this reads a consistent and steady 60ohms at the ECU connector.

I can turn the engine starter if I short the starter relay so every thing fine there.

I also tested the continuity and Resistance on the canbus pins to the Diagnostic socket. the resistance reads quite low but the continuity is there. Opcom BCM and display fault codes says that there is no power to diagnistic socket and no comms with ECU - would the power to the dianostic socket come from the CIM? Everything on Lcanbus and Medium canbus is fine - it'sjust the high can bus that is dead. It's got to be the CIM then?

So all this draws me to the conclusion that it has to be a faulty CIM unit. wopuld that be right?

I understand that the CIm units need to be precisely replaced with one with the same code. Is this right too?

In this case the code on the cars CIM is 1312473 CK - which appears to be a rare one? Can I use another?

I have found one but it is not 'divorced' from donor car neither does it have a security code. Is it worth buying? - Can I re program it from opcom without it being divorced or without a code please? a brand new CIM is over 500 - the car is not worth it?

getting a replacement second hand CIM - if I can find one - will be the last chance for his job - I have been offered a 100.00 for it scrap - seems such a shame - it evne has a fridge?

If you have nay further advice and could answer these questions I would be really grateful.

many thanks

yours Ben

**Dog_Book** · 30th August 2018, 19:12

Just wondering as my brain cell has froze up, what does AHL stand for? Ive only ever seen AFL mentioned.

**plasma** · 30th August 2018, 19:40

I'm sure theres a section where abbreviations would be.. mmmm

Anyway its Automatic Headlamp Levelling

cim units do no need to be exact, but you do need to know what your doing. Buying one without a code is a no-no as you cannot clear it otherwise....

Will look up and see whats 'special' about the ck one..

Your one digit missing on the part number and I dont even see a CK one listed..? Do you know if its a single stage airbag or dual stage as very early ones are single stage (ie one plug from cim to airbag)

**Ben Hughes** · 30th August 2018, 21:03

Thank you as ever plasma,

here is the link to the one on ebay that matches the CIM on the Signum that I am working on.

https://www.ebay.co.uk/itm/152815276661?ul_noapp=true

Unfortunately the dismantler who i called on the phone does not have the code - it has not been divorced using TECH 2 and the rest of the car has been scrapped. there is another with the part number in Germany but it is hundreds.

the connections are exactly the same ie two airbag locking tabs. Ur right I left a digit off and it is - 13132473 GK

where are you based please plasma?

thanks Ben

**Dog_Book** · 30th August 2018, 21:18

Originally Posted by Ben Hughes

Thank you as ever plasma,

here is the link to the one on ebay that matches the CIM on the Signum that I am working on.

https://www.ebay.co.uk/itm/152815276661?ul_noapp=true

Unfortunately the dismantler who i called on the phone does not have the code - it has not been divorced using TECH 2 and the rest of the car has been scrapped. there is another with the part number in Germany but it is hundreds.

the connections are exactly the same ie two airbag locking tabs. Ur right I left a digit off and it is - 13132473 GK

where are you based please plasma?

thanks Ben

I think he's just east of London.

**Ben Hughes** · 1st September 2018, 08:38

please could you advise me on CIM module 13132473GK - having difficulty locating one - could I use 13132475GL? Or does anyone know a good vauxhall supplier for these modules.

Appreciate any help - Ben