With your meter in continuity mode you should be able to see if the switch is doing anything or not?
Retrofit Cruise Control Diagnostics
- Thread starter Moose94
- Start date
Rugby
I’ll see if I can find someone local to borrow one to test.
Or, if anyone’s around the rugby/leamington/Gaydon area and is willing to help I’d be most grateful!
Between the violet cable and the blue?
I'm not sure but you could try all combinations whilst pushing the lever and see if anything changes.
I’ll give it a go after dinner.
Good spot.
OP, did you lift the flap on the connector before pushing them home?
As they are 100% not fully seated. I don't think they're making contact with the pins on the switch.
Not the easiest photos to get but with the connectors on, 12v is making it way through the stalk to the other side on the same terminal.
Continuity test is negative, no connection between the violet and the blue wire when the stalk is engaged in any way.
I’ve prised open the harness connector and they are as in as they will go.
I can confirm they do fire with the car below 20mph.
Mine was reporting signals even with the engine off, just the ignition on.
Aaah really good info to know, thanks.
That helps narrow it down to atleast doing static tests!
No worries
Stupid check, but still... Have you checked continuity to the ECU pin from the switch pin?
When I first did mine, the wire got caught in the lid of the engine bay fuse box. Luckily it didn't cut/damage it, but it's worth checking if you know you've got 12v
Stupid check, but still... Have you checked continuity to the ECU pin from the switch pin?
When I first did mine, the wire got caught in the lid of the engine bay fuse box. Luckily it didn't cut/damage it, but it's worth checking if you know you've got 12v
Ill give that a go tomorrow, thats the last continuity check i can do i think.
The Z4's came with both M54, N46 and N52 engines. Are you using the correct instructions for the engine model you have? They will have different pins for the DME connection.
CAN-bus is nominally 12V and the voltage will drop to approx 11.5V when signals are being sent. So, you can check the blue wire.
Just looked up the DME wiring for the N52 cruise control. It looks to connect to pin 4 of X60002 for the N52 engine. See the below:
Also read: https://bmwteka.com/wds/ru/e85/f9d61391
CAN-bus is nominally 12V and the voltage will drop to approx 11.5V when signals are being sent. So, you can check the blue wire.
Just looked up the DME wiring for the N52 cruise control. It looks to connect to pin 4 of X60002 for the N52 engine. See the below:
Also read: https://bmwteka.com/wds/ru/e85/f9d61391
Steady 9.5v coming out of the blue wire at all times, switches pressed or not.The Z4's came with both M54, N46 and N52 engines. Are you using the correct instructions for the engine model you have? They will have different pins for the DME connection.
CAN-bus is nominally 12V and the voltage will drop to approx 11.5V when signals are being sent. So, you can check the blue wire.
Just looked up the DME wiring for the N52 cruise control. It looks to connect to pin 4 of X60002 for the N52 engine. See the below:
Also read: https://bmwteka.com/wds/ru/e85/f9d61391
Continuity is fine between the blue point on the back of the switch all the way to the DME connector point.
Is everyone else’s cruise via CAN set to nein?If I’m getting only 9.5v out of the blue wire then maybe that’s the route cause.
I just checked mine (sorry for the delay), and I get the same as no - cruise control via CAN = no.
This is probably fine, as the blue wire provides the signal wire for the cruise control. It doesn't tie into the k-bus on the e85/6. I guess it might do on other N52 equipped cars (like the E90, with the radar cruise, and the ability to apply brakes etc).
You can see my cruise control switch reading, and the CAN status. 2007, E86 3.0si manual.
This is probably fine, as the blue wire provides the signal wire for the cruise control. It doesn't tie into the k-bus on the e85/6. I guess it might do on other N52 equipped cars (like the E90, with the radar cruise, and the ability to apply brakes etc).
You can see my cruise control switch reading, and the CAN status. 2007, E86 3.0si manual.
Translated version for those not so hot at German 
What I wish I had checked was that via CAN status while flicking the stalk. Annoyingly, I didn't think too, and my diagnosis laptop is so old and clunky, it's a pain to set up again. But I don't think it's relevant, based on the blue wire comment above
What I wish I had checked was that via CAN status while flicking the stalk. Annoyingly, I didn't think too, and my diagnosis laptop is so old and clunky, it's a pain to set up again. But I don't think it's relevant, based on the blue wire comment above
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