Right then, I've run Lexia over the Secondary Electric Brake ECU, originally there were 4 faults listed:
C1554 - Temporary fault, Electric motor temperature sensor Coherence
P0562 - Temporary fault, ECU low supply voltage
C1550 - Temporary fault, Brake cable
C1559 - Temporary fault, Electric motor control
so I cleared those fault, which all cleared and then tried to reset the handbrake, at which point I got these faults
C155E - Temporary fault, Mechanical unlocking of the electric parking brake detected
U1108 - No communication with engine EC U no signal
U1313 - Permanent fault, No communication with electronic stability program (ESP) ecu
C1559 - Temporary fault, Electric motor control
once again I cleared the faults and they have all disappeared, but I still get the flashing red circle!
X7 Electric handbrake
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Re: X7 Electric handbrake
Steve
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Re: X7 Electric handbrake
So P0562 would explain a lack of communication with the ECU. The ECU needs a minimum of 8.1V to operate. Now I can tell you that I had a similar issue with the parking brake not releasing after I had the car parked up for a few weeks and the battery was in a weakened condition. I took the battery off and charged it overnight, and then after 2 attempts at releasing the handbrake it worked. It did take a while - so seemed to be doing some sort of calibration. So I applied it a couple of times and all is well again.
The thermal code (C1554) I can understand if you have been continually operating and attempting to release it - that would make sense.
As for U1313, that relates to a fault in the reception of the partial triggering message by the built-in systems interface - but agrees with the same conclusion as the C1559 fault as being the unit itself (unless you had any reason to suspect the ESP ECU).
However the remaining issue of C1559 could be the unit itself and may need replacing. What exactly the 2000 'Maximum number of releases at the Stop' relates to exactly, I can't say, but that can't relate to the max. number of applications as that would be over in 250 days at 4 application and release cycles a (8 operations per day).
Ok, so here is the common fault - and below the table are the symbols / warning lights that 'a, b & c' refer to.
The thermal code (C1554) I can understand if you have been continually operating and attempting to release it - that would make sense.
As for U1313, that relates to a fault in the reception of the partial triggering message by the built-in systems interface - but agrees with the same conclusion as the C1559 fault as being the unit itself (unless you had any reason to suspect the ESP ECU).
Fault Code | U1313 |
After sales description of the fault code | Fault in the reception of the partial triggering message by the built-in systems interface (BSI) |
Description of the diagnostics | The dynamic stability control ECU causes functional faults |
Conditions of activation of the diagnostics | Ignition on |
Conditions of disappearance of the fault | Reception of 3 consecutive items of valid information |
Down-grade modes if fault present | Deactivation of automatic mode Ignition on: The electrically controlled parking brake releases if the button is not held Ignition off: The electrically controlled parking brake releases if you hold the button for less than 3 seconds |
Switching on of the warning lamp and/or warning message | Warning lamp - "a": lit - "b": lit - "c": lit |
Main customer complaints likely | Switching on of the warning lamp and/or warning message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly Electrically-controlled parking brake does not release correctly Electrically-controlled parking brake applies itself unexpectedly The hill start assist is not working Loss of stability of the vehicle in dynamic braking |
Suspect areas | Electronic stability control (ESP) Electric parking brake |
However the remaining issue of C1559 could be the unit itself and may need replacing. What exactly the 2000 'Maximum number of releases at the Stop' relates to exactly, I can't say, but that can't relate to the max. number of applications as that would be over in 250 days at 4 application and release cycles a (8 operations per day).
Ok, so here is the common fault - and below the table are the symbols / warning lights that 'a, b & c' refer to.
Fault Code | C1559 |
After sales description of the fault code | System locked: Electric motor, cables or callipers |
Description of the diagnostics | Threshold of the application and release counter exceeded Rotation speed of the electric motor too high Lockup detected Maximum number (=2000) of releases at the stop exceeded |
Conditions of activation of the diagnostics | Activation of the electrically-controlled parking brake |
Conditions of disappearance of the fault | Application and release of the electrically-controlled parking brake successful |
Down-grade modes if fault present | Deactivation of automatic mode No application or release |
Switching on of the warning lamp and/or warning message | Warning lamp - "a": lit - "b": On for 10 seconds after the request for application or release - "c": lit |
Main customer complaints likely | Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly |
Suspect areas | Electric parking brake |
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Re: X7 Electric handbrake
So basically, looking at the above, it sounds like the electronic handbrake is knackered.........
I get it up on ramps tomorrow and see if I can see if anything
I get it up on ramps tomorrow and see if I can see if anything
Steve
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Re: X7 Electric handbrake
Hi Steve
Did you get anywhere with this? Mines got a snapped cable and I’m not looking forward to spending over a grand on a new unit.
Did you get anywhere with this? Mines got a snapped cable and I’m not looking forward to spending over a grand on a new unit.
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Re: X7 Electric handbrake
To be perfectly honest, I've decided to bite the bullet and buy a new one........ not ideal.....but......
when the old one is off, im going to strip it down and see what's what.......
when the old one is off, im going to strip it down and see what's what.......
Steve
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Re: X7 Electric handbrake
Right, Time to hold my hands up........ I’m a muppet......... nothing wrong with the handbrake mechanism, when I was underneath, I failed to notice the one of the plastic spacers, which are about the size of a 13mm socket, was missing.
Two new ones ordered for £5 and handbrake reset and fully working.
Two new ones ordered for £5 and handbrake reset and fully working.
Steve
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Re: X7 Electric handbrake
Sometimes it's the little things.... Well done Steve and thanks for the update.
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Marc
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