Replacing the CJB
#1
Replacing the CJB
Greetings fellow earthlings. My 2011 XJ 5.0 Portfolio has got the nagging 'washer fluid low' warning light coming on. At first was intermittent and now is on all the time. The sensor was reading several kohms when the switch was closed so replaced it with a new one (which I tested first - zero ohms when closed) and still got the fault. Disconnected the battery thinking a hard reset might clear it, even reset the CAN modules to no avail. Voltage at the plug behind the wheel arch liner is only 0.8 volts and there's no break in the cable which leaves the central junction box as the only other thing I can think of. Have removed it, cleaned all the contacts and fuses and didn't spot any corrosion or water ingress when I removed the covers so I suspect a component has died or shorted out.
If I replace the CJB with the same model from a donor car does it need to be reprogrammed or will it self-learn from the other modules in the car? I have a NT520 diagnostic unit which will enable me to recalibrate a number of items. I know it's a minor thing that can be fixed by pushing OK on the steering wheel but I like everything to work (it's the OCD in me). Thanks in advance.
If I replace the CJB with the same model from a donor car does it need to be reprogrammed or will it self-learn from the other modules in the car? I have a NT520 diagnostic unit which will enable me to recalibrate a number of items. I know it's a minor thing that can be fixed by pushing OK on the steering wheel but I like everything to work (it's the OCD in me). Thanks in advance.
#2
To replace a CJB with a used one you'll need to do a following with a SDD:
-immobilization, otherwise there'll be no start/no ignition
-reload a CCF
and after that a CJB will still have a wrong VIN number, at least untill you reprog it with a special device (and there's a bit of soldering required)
-immobilization, otherwise there'll be no start/no ignition
-reload a CCF
and after that a CJB will still have a wrong VIN number, at least untill you reprog it with a special device (and there's a bit of soldering required)
#3
To replace a CJB with a used one you'll need to do a following with a SDD:
-immobilization, otherwise there'll be no start/no ignition
-reload a CCF
and after that a CJB will still have a wrong VIN number, at least untill you reprog it with a special device (and there's a bit of soldering required)
-immobilization, otherwise there'll be no start/no ignition
-reload a CCF
and after that a CJB will still have a wrong VIN number, at least untill you reprog it with a special device (and there's a bit of soldering required)
#4
I took my 2013 XJ to the dealer for a recurring "Washer Fluid Low" warning light. The technician couldn't find a leak anywhere, and my service advisor explained that the float valve in the reservoir can be triggered when the front of the car is on an uphill incline. He also explained that the washer reservoir is in 2 sections that snap together, but don't have a watertight seal at that point, so when you fill the tank to the very top it will slowly leak out at that joint and when you open the cap it will appear to need more fluid.
I decided to verify this while still at my dealer. I knew that the reservoir was filled to capacity, so I drove to the part of his parking lot that had a steep incline, parked, and then restarted the car. The warning light came on immediately, even though the reservoir was full. I opened the fill cap and it appeared to need more fluid, but I knew it was far from being empty.
Just another one of those things that makes Jaguar a Jaguar!
I decided to verify this while still at my dealer. I knew that the reservoir was filled to capacity, so I drove to the part of his parking lot that had a steep incline, parked, and then restarted the car. The warning light came on immediately, even though the reservoir was full. I opened the fill cap and it appeared to need more fluid, but I knew it was far from being empty.
Just another one of those things that makes Jaguar a Jaguar!
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fossberry (11-29-2020)
#5
I took my 2013 XJ to the dealer for a recurring "Washer Fluid Low" warning light. The technician couldn't find a leak anywhere, and my service advisor explained that the float valve in the reservoir can be triggered when the front of the car is on an uphill incline. He also explained that the washer reservoir is in 2 sections that snap together, but don't have a watertight seal at that point, so when you fill the tank to the very top it will slowly leak out at that joint and when you open the cap it will appear to need more fluid.
I decided to verify this while still at my dealer. I knew that the reservoir was filled to capacity, so I drove to the part of his parking lot that had a steep incline, parked, and then restarted the car. The warning light came on immediately, even though the reservoir was full. I opened the fill cap and it appeared to need more fluid, but I knew it was far from being empty.
Just another one of those things that makes Jaguar a Jaguar!
I decided to verify this while still at my dealer. I knew that the reservoir was filled to capacity, so I drove to the part of his parking lot that had a steep incline, parked, and then restarted the car. The warning light came on immediately, even though the reservoir was full. I opened the fill cap and it appeared to need more fluid, but I knew it was far from being empty.
Just another one of those things that makes Jaguar a Jaguar!
#7
I have had the same issue with my 2013 XF portfolio The other issue that started happening at same time was the sporadic locking and unlocking of the doors. Unfortunately getting this CJB wiring replaced at the dealer will cost close to half the value of the car! I am afraid an independent local garage might introduce other issues 😔
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